Chainrings

- Compatible with 1-piece BMX cranks - CNC machined 6061-T6 alloy construction - Teeth: 25T - Material: Alloy - Chain Compatibility: 1/2x 1/8-inch - Tooth Type: Standard

More power, better traction, less shifting. Wolf Tooth oval chainrings use our proprietary PowerTrac design that has all the benefits of oval, but without the funky, uneven pedal stroke. Ride one once and you'll wonder why you waited so long to try oval. Think of an oval chainring as two chainrings in one. A major benefit of oval is how the shape of the chainring alters your gearing in two important phases of your pedal stroke by harnessing your body's natural biomechanics. Here's how it works. The area of the chainring with the larger diameter engages with the chain at the optimal point on the downstroke, which is what's known as the Power Zone. If you were to look at a clock, the Power Zone would be between 1-5 and 7-11. Conversely, the Recovery Zone – back to the clock face, between 11-1 and 5-7 – is the weakest part of the pedal stroke, when the oval maximizes your efficiency. A 34T oval chainring behaves like a 36T chainring when you want power, while behaving like a 32T chainring when you're climbing. We've also engineered our oval chainrings to provide smoother, more efficient pedal rotation. This equates to better traction because of steadier torque on the rear wheel. With a Wolf Tooth oval chainring, you can harness more of your strength in the Power Zone, while having easier pedaling in the Recovery Zone. Compatibility: - These rings are for use with 110 BCD 5 arm cranksets. - Crank arm clocking arrow will be rotated 180 degrees from normal on cranksets that have 4 bolts visible and 1 hidden bolt behind the crank arm like for SRAM. - Wolf Tooth's patented Drop-Stop® wide/narrow tooth profile for the ultimate chain retention and mud shedding ability - Chainline - varies - these rings can be mounted in either the big or small ring position on a double cranksets. The most common mounting is in the big ring position because of chainstay clearance. The ring centerline is ~2mm from the ring's mounting face so they usually sit about 2mm closer to the frame than the stock big ring (depends on the stock ring) - Can be mounted in either the big or small ring position of a double crankset given chainstay clearance in the small ring position. - Stock 2x bolts will not work. You will need bolts like our 6mm bolts which are optimized for single ring mounting. - Use Drop-Stop B for all SRAM Eagle, SRAM Road and Transmission (T-Type) Flattop chains, 9, 10, and 11spd chains or 12spd KMC, Connex, Wippermann, Campagnolo. DROP-STOP B - Compatible 9, 10, 11, and 12s SRAM Eagle, 12s SRAM Transmission (T-type) Flattop, 12s Campy, 12s KMC - Not compatible with 12s Shimano HG+ chains Recommendations - - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur! Without these precautions, you may experience chaindrops and/or chainsuck. - Recommend the use of a clutch style rear derailleur for the best chain security. Tech Specs: - Weight: 36t/58g | 38t/66g | 40t/74g | 42t/81g - Material: 7075-T6 aluminum - Made in the USA

Looking for a 1X chainring for your Shimano compact triple crankset - models M782, M672, M622, or M612 – with the proven chain retention of our Drop-Stop® chainrings? Wolf Tooth has what you need in this beautifully machined chainring with threaded standoffs that proved and ideal chainline. - Fits any 96 BCDShimano Symmetric 4-bolt crankset - Drop-Stop technology. On Wolf Tooth’s patented wide/narrow chainring, the wide side of the tooth has maximum contact on the drive side which spreads the load and improves chainring life. The narrow side allows clearance for mud and debris which reduces friction. - Alternating wide/narrow tooth pattern prevents chain derailment Compatibility: - These rings fit any 96 BCD Shimano Symmetric bolt pattern crankset, and here are instructions on how to measure your BCD. - Compatible with the following Shimano crankset models: M782, M672, M622, M612 - Not compatible with XTR M9000 or XT M8000 - If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention) - Chainline - 49mm. Provides a great chainline on most boost bikes. Use Drop-Stop A or B for all 9, 10, and 11spd chains or 12spd SRAM Eagle, KMC, Connex or Wippermann chains DROP-STOP A - Wolf Tooth Drop-Stop A is the original patented wide/narrow chainring compatible with multiple drivetrain brands including 9, 10, 11, and 12spd SRAM Eagle, KMC, Wippermann, etc. - NOT compatible with 12spd SRAM Transmission (T-Type) Flattop, 12spd Shimano HG+, or 12spd Campy Recommendations - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck. Tech Specs: - Weight: 30/41g | 32t/50g | 34t/59g - Material: 7075-T6 aluminum - Made in the USA

SHIMANO's SM-CRE70-B chainring for STEPS E7000 E-MTB drive system features a modern design for 9/10/11-speed drive units. - Chainline 53 mm - Chainring teeth: 34T - Without chain guard type

The megatooth design allows you to put all of your power through without worrying about dropping your chain. All sizes of these chainrings are steel and range from 32T to 34T. - CNC machined 7075/T6 aluminum with thick and thin tooth design for maximum chain engagement - Long tooth profile enhances chain retention - Shifting ramps and stainless steel pins on outer rings - Black anodized with CNC silver - Laser-etched logo

More power, better traction, less shifting. Wolf Tooth oval chainrings use our proprietary PowerTrac design that has all the benefits of oval, but without the funky, uneven pedal stroke. Ride one once and you'll wonder why you waited so long to try oval. Think of an oval chainring as two chainrings in one. A major benefit of oval is how the shape of the chainring alters your gearing in two important phases of your pedal stroke by harnessing your body's natural biomechanics. Here's how it works. The area of the chainring with the larger diameter engages with the chain at the optimal point on the downstroke, which is what's known as the Power Zone. If you were to look at a clock, the Power Zone would be between 1-5 and 7-11. Conversely, the Recovery Zone – back to the clock face, between 11-1 and 5-7 – is the weakest part of the pedal stroke, when the oval maximizes your efficiency. A 34T oval chainring behaves like a 36T chainring when you want power while behaving like a 32T chainring when you're climbing. We've also engineered our oval chainrings to provide smoother, more efficient pedal rotation. This equates to better traction because of steadier torque on the rear wheel. With a Wolf Tooth oval chainring, you can harness more of your strength in the Power Zone, while having easier pedaling in the Recovery Zone. These chainrings are for Shimano direct mount cranks. The Wolf Tooth chainrings feature our patented Drop-Stop® design for the best wear life, chain retention, and mud clearance. Compatibility - Shimano XTR M9100, XT M8100, and SLX M7100 series 12 speed cranksets. - Our chainring offset matches the offset of Shimano chainrings to replicate the intended chainline for the crankset. - Available in multiple tooth profiles for optimal performance based on your chain type. Use Drop-Stop ST for use with Shimano 12-speed Hyperglide+ and 12spd KMC chains. Use Drop-Stop A for all 9, 10, and 11spd chains or 12spd SRAM Eagle, KMC, Connex or Wippermann chains. Drop-Stop B is optimized for SRAM 12 spd Transmission (T-type) and Road Flattop chains but is compatible with all chains that work with Drop-Stop A. DROP-STOP A - Wolf Tooth Drop-Stop A is the original patented wide/narrow chainring compatible with multiple drivetrain brands including 9, 10, 11, and 12s SRAM Eagle, KMC, Wippermann, etc. - NOT compatible with 12s SRAM Transmission (T-Type) Flattop, 12s Shimano HG+, or 12s Campy DROP-STOP B - Compatible 9, 10, 11, and 12s SRAM Eagle, 12s SRAM Transmission (T-type) Flattop, 12s Campy, 12s KMC - Not compatible with 12s Shimano HG+ chains DROP-STOP ST - Compatible with 12s Shimano Hyperglide+ chain and 12s KMC chain only - Symmetric Trapezoidal (ST) tooth shape is optimized for Shimano HG+ chain Recommendations - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck. Tech Specs: - Weight: 32/65g - Material: 7075-T6 aluminum - Made in the USA

Shimano XT M8000 11-Speed Chainrings - Chainring BCD: 96 Shimano Asymmetric - Color: Black - Drivetrain Speeds: 11 - Material: Aluminum - Ring Position/Type: Inner - Tooth Count: 34

Shimano XT CRM80 1x11 Chainrings - Hollow gear construction for optimized rigidity, weight, and rigidity - Durable teeth using plated steel construction supported by a carbon composite (CFRP) carrier body - Dyna-Sys11 HG-X11 11-speed chain compatible - Chainring BCD: 96 Shimano Asymmetric - Color: Black - Drivetrain Speeds: 11 - Material: Steel/Carbon - Ring Position/Type: Chain Retaining Single Ring - Tooth Count: 30

Original equipment on SRAM and Truvativ cranks, these chainrings also work well with other drivetrains. - Medium Overshift Pin - 104mm BCD - Use with 22T

The Shimano R9100 series crankset achieves the ultimate in optimal power transfer. It does this through a more reinforced outer chainring on its unique asymmetrical four-arm spider construction. - Chainring BCD: 110 Shimano Asymmetric - Drivetrain Speeds: 11 - Material: Aluminum - Ring Position/Type: Outer

Origin-8's Alloy Ramped Chainrings are CNC-machined in the USA out of tough, light and durable 6061-T6 aluminum and are compatible with 8-, 9- and 10-speed drivetrain components. They have ramped teeth and are pinned for superior shifting and durability, and feature an attractive and corrosion-resistant black anodized finish.

SRAM X-SYNC 2 1x chainrings provide a high level of performance and durability. The aggressive teeth design provides better chain retention for a smoother, more efficient pedal feel. With a focus on long wear-life, the design reduces friction and the accumulation of mud, grit, and grime. - The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain - X-SYNC 2 chainring design increases chain retention, improves durability, and reduces friction and noise - Designed to be used with Eagle chain - 104mm BCD

Origin8's Thruster 104mm BCD 4-bolt chainrings are great for MTB, Boost, and Fat applications. Their Narrow/Wide tooth design provides chain retention on 1x systems, and they are 10, 11, or 12 speed compatible. - Forged and hard anodized AL6061-T6 alloy construction - BCD: 104mm 4-Bolt - Type: 1x - Chain Compatibility: 10/11/12s - Tooth Type: Narrow/Wide

Looking for a SRAM XO1, X1, GX, and NX chainring with the proven chain retention of our patented Drop-Stop® chainrings? Wolf Tooth has what you need in these beautifully machined 94 BCD bolt-on chainrings. - Fits any 94 BCD SRAM crankset - Drop-Stop® technology. On Wolf Tooth’s patented wide/narrow chainring, the wide side of the tooth has maximum contact on the drive side which spreads the load and improves chainring life. The narrow side allows clearance for mud and debris which reduces friction. - Alternating wide/narrow tooth pattern prevents chain derailment Compatibility: - These rings fit any SRAM mountain bike crankset with a 94 BCD. Note that we also offer SRAM direct mount chainrings for standard, boost and BB30 short spindle cranksets and some stainless steel versions. - If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention) - Chainline - 49mm - Provides a great chainline on most boost bikes. Use Drop-Stop A or B for all 9, 10, and 11spd chains or 12spd SRAM Eagle, KMC, Connex or Wippermann chains DROP-STOP A Wolf Tooth Drop-Stop A is the original patented wide/narrow chainring compatible with multiple drivetrain brands including 9, 10, 11, and 12spd SRAM Eagle, KMC, Wippermann, etc. NOT compatible with 12spd SRAM Transmission (T-Type) Flattop, 12spd Shimano HG+, or 12spd Campy Recommendations - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck. Tech Specs: - Weight: 30t • 44g | 32t • 54g | 34t • 63g - Material: 7075-T6 aluminum - Made in the USA - US Patent 958123

These chainrings are for Easton or Race Face Cinch cranks. Updated tooth profile works with SRAM Flattop chain. The Wolf Tooth Cinch chainrings feature our patented Drop-Stop® design for the best wear life, chain retention, and mud clearance. Compatibility: - Easton Cinch™ cranksets including EC90SL - Works with SRAM Flattop chain - Wolf Tooth's patented Drop-Stop® wide/narrow tooth profile for the ultimate chain retention and mud shedding ability - Use Drop-Stop B for all SRAM Eagle, SRAM Road and Transmission (T-Type) Flattop chains, 9, 10, and 11spd chains or 12spd KMC, Connex, Wippermann, Campagnolo. DROP-STOP B Compatible 9, 10, 11, and 12spd SRAM Eagle, 12spd SRAM Transmission (T-type) Flattop, 12spd Campy, 12spd KMC Not compatible with 12spd Shimano HG+ chains Recommendations - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck. Tech Specs: - Weight: 38t/80g | 40t/91g | 42t/96g | 44t/113g | 46t/129g | 48t/139g | 50t/149g - Material: 7075-T6 aluminum - Made in the USA

• Replacement for one-piece crank • Steel

Original equipment on SRAM and Truvativ cranks, these chainrings also work well with other drivetrains.

SRAM's X-Sync 11-speed chainring features tall teeth with an alternating tooth profile to hold the chain amazingly well and still provide space for mud to clear. - Drivetrain Speeds: 10, 11 - Material: Aluminum - Ring Position/Type: Chain Retaining Single Ring

Origin-8's BMX/SS/Fixie Chainrings are CNC-machined in the USA out of tough, light and durable 6061-T6 aluminum and are compatible with BMX, fixie and track drivetrain components. They have an attractive and corrosion-resistant anodized finish.

Origin-8's BMX/SS/Fixie Chainrings are CNC-machined in the USA out of tough, light and durable 6061-T6 aluminum and are compatible with BMX, fixie and track drivetrain components. They have an attractive and corrosion-resistant anodized finish.

- Precision CNC-machined AL7075/T6 - Shifting ramps and stainless steel pins on outer rings - Laser-etched logo - Crankset Compatibility: Gossamer ABS 2019

Shifting performance has helped Full Speed Ahead to become a world leader for high-end chainrings. No one studies the design and manufacturing of each system, and each tooth, as carefully as we do. Our dedication shows in every revolution of the crank, and every perfect shift achieved. To meet or exceed the needs of any drivetrain, Full Speed Ahead has developed sophisticated design, testing and manufacturing protocols. This allows Full Speed Ahead to match your needs as perfectly as our chainrings match a chain. We offer more options, levels, and finishes than our competitors. We use the best materials available, imported from the USA, Europe, or sourced from our qualified vendors in Asia, to guarantee the durability, performance, and appearance will out-perform, and outlast the competition. Full Speed Ahead chainrings have powered multiple World, Tour de France, and Olympic champions, and will exceed your expectations. - Stamped AL7075/T6 - Chainrings are compatible with all 10-speed drivetrains, and compatible with FSA, SRAM, and Shimano 11-speed drivetrains - Drivetrain Speeds: 11, 10

Shimano Ultegra R8000 Series Chainrings are designed for use with Shimano's 11-speed Ultegra crankset.

These chainrings are for Shimano GRX cranks. They feature our patented Drop-Stop® design for the best wear life, chain retention, and mud clearance. Drop-Stop ST is specifically for the Shimano 12-speed Hyperglide+ chain, which is used by GRX 12-speed. Drop Stop-B works with all other 9, 10, 11, and 12-spd chains, including SRAM Flattop. Compatibility: - Shimano GRX cranksets including RX600 and RX810 - Drop-Stop ST is designed for Shimano 12-speed Hyperglide+ chains - Drop-Stop B tooth profile is compatible with SRAM Flattop chain - Wolf Tooth’s patented Drop-Stop wide/narrow tooth profile provides the ultimate chain retention and mud-shedding ability - Use Drop-Stop B for all SRAM Eagle, SRAM Road and Transmission (T-Type) Flattop chains, 9, 10, and 11spd chains or 12spd KMC, Connex, Wippermann, Campagnolo. DROP-STOP B Compatible 9, 10, 11, and 12spd SRAM Eagle, 12spd SRAM Transmission (T-type) Flattop, 12spd Campy, 12spd KMC Not compatible with 12spd Shimano HG+ chains

The EX1 drive train was designed specifically for the demands of electric-assist mountain bikes: a wide gear range with bigger jumps between gears and sturdy components to handle higher torque loads. Liberal use of features found on SRAM’s high end MTB parts provide high value, quiet operation and ease of service. - X-Sync (wide-narrow) tooth profiles for great chain management - Compatible with Bosch mid-drive E-bike systems - Material: Steel - Size/BCD: Direct mount - Recommended Group: EX1

12 Good Reasons If you're looking for a bomber new chainring that can run with your Shimano 12 speed drivetrain, then look no further. This direct mount ring has the versatility of RF CINCH integration and the stiffness to turn all your "push" into straight-up "go". Built to Last Created from 4mm-thick 7075-T6 alloy plate for big-time stiffness and strength. Its NW tooth profile is Shimano 12-speed specific and provides secure chain retention All-Round Performer The Race Face CINCH interface makes this direct mount chainring fast and easy to swap for different sizes to customize your Shimano 12-speed drivetrain. - Compatible with Cinch Direct Mount Cranks - 7075 Aluminum - Direct Mount

This is a 96mm BCD chainring for a 1X chainring for XTR M9000 crankset with the proven chain retention of our Drop-Stop® chainring. They fit only the Shimano XTR M9000 and M9020 cranksets (race and trail respectively). They have an asymmetrical 96 mm BCD with built-in threaded standoffs to provide the ideal 1X chainline. - Fits 96 BCD XTR M9000 and M9020 cranksets - Drop-Stop technology. On Wolf Tooth's patented wide/narrow chainring, the wide side of the tooth has maximum contact on the drive side which spreads the load and improves chainring life. The narrow side allows clearance for mud and debris which reduces friction. - Alternating wide/narrow tooth pattern prevents chain derailment Compatibility: - These rings fit on the Shimano XTR M9000 and M9020 1x or 2x cranksets - Use only the stock Shimano XTR chainring bolts (M7x.75) - You will not use the stock bolt caps when mounting this ring. The stock bolts will thread into the chainring's standoffs from the outside of the crankset - For 1x9, 1x10, 1x11 and 1x12 drivetrains (including SRAM Eagle) If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention) - Chainline - 49 mm for 30-34T and 50 mm for 36T. Provides a great chainline on most boost bikes - Available in multiple tooth profiles for optimal performance based on your chain type. Use Drop-Stop ST for use with Shimano 12-speed Hyperglide+ and 12spd KMC chains. Use Drop-Stop A for all 9, 10, and 11spd chains or 12spd SRAM Eagle, KMC, Connex or Wippermann chains. Drop-Stop B is optimized for SRAM 12 spd Transmission (T-type) and Road Flattop chains but is compatible with all chains that work with Drop-Stop A. DROP-STOP A - Wolf Tooth Drop-Stop A is the original patented wide/narrow chainring compatible with multiple drivetrain brands including 9, 10, 11, and 12spd SRAM Eagle, KMC, Wippermann, etc. - NOT compatible with 12spd SRAM Transmission (T-Type) Flattop, 12spd Shimano HG+, or 12spd Campy DROP-STOP ST - Compatible with 12spd Shimano Hyperglide+ chain and 12spd KMC chain only - Symmetric Trapezoidal (ST) tooth shape is optimized for Shimano HG+ chain Recommendations - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck. Tech Specs: - Weight: 30/41g | 32t/50g | 34t/59g | 36t/69g - Material: 7075-T6 aluminum - Made in the USA

Wolf Tooth was first to market with Cyclocross 1x specific chainrings because we saw Cyclocross as the perfect use for our Drop-Stop® technology. Since their release, the uses for these rings has expanded beyond Cyclocross to commuting, gravel riding, mountain bikes with 5-arm crank power meters, and even full on-road applications with the giant 50t rings. Fits 110 BCD 5 arm cranksets Drop-Stop technology. On Wolf Tooth’s patented wide/narrow chainring, the wide side of the tooth has maximum contact on the drive side which spreads the load and improves chainring life. The narrow side allows clearance for mud and debris which reduces friction. Alternating wide/narrow tooth pattern prevents chain derailment Compatibility: - These rings are for use with 110 BCD 5-arm cranksets. - Stock 2x bolts will not work. You will need bolts like our 6mm bolts which are optimized for single ring mounting. - Chainline - varies - these rings can be mounted in either the big or small ring position on a double cranksets. The most common mounting is in the big ring position because of chainstay clearance. The ring centerline is ~2mm from the ring's mounting face so they usually sit about 2mm closer to the frame than the stock big ring (depends on the stock ring) Recommendations - Recommend the use of a clutch-style rear derailleur for the best chain security. - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur! - Without these precautions, you may experience chaindrops and/or chainsuck. Tech Specs: - Weight: 34t/44g | 36t/58g | 38t/66g | 40t/74g | 42t/81g | 44t/90g | 46t/107g | 48t/115g | 50t/125g - Material: 7075-T6 aluminum - Made in the USA

Wolf Tooth was first to market with cyclocross 1x specific chainrings because we saw cyclocross as the perfect use for our Drop-Stop® technology. Since their release, the uses for these rings has expanded beyond cyclocross to commuting, gravel riding, and even full on-road applications with the giant 52t rings. - Fits 130 BCD 5 arm cranksets - Drop-Stop technology. On Wolf Tooth’s patented wide/narrow chainring, the wide side of the tooth has maximum contact on the drive side which spreads the load and improves chainring life. The narrow side allows clearance for mud and debris which reduces friction. - Alternating wide/narrow tooth pattern prevents chain derailment Compatibility: - These rings are for use with 130 BCD 5-arm cranksets. - Do NOT fit on the cranksets for Shimano DA 9000 / Ultegra 6800 - Not compatible with Campy CX10/11. - SRAM Exogram cranksets with inset nut must use stock fifth bolt + spacer(s). The Force CX1 bolt features a fifth bolt with 1x specific shoulder. This kit can be found online. - 38T important note: The chain may contact the spider arm slightly when using the 38T chainring (see last photo in the product images). We recommend filing a small chamfer on the spider arm but you can also just install it and let the chain do the work. This is only an issue with the 38T as the 130 BCD was designed for 39T smallest ring. - Stock 2x bolts will not work. You will need bolts like our 6mm bolts which are optimized for single ring mounting. Tech Specs: - Weight: 38t/52g | 40t/60g | 42t/62g | 44t/79g | 52t/132g - Material: 7075-T6 aluminum - Made in the USA - This 1x chainring and can be mounted in either the inner or outer ring position of a double crankset but can not be used in a 2x setup. - Chainline - The most common mounting is in the outer ring position because of chainstay clearance. The ring centerline is ~2mm from the ring's mounting face so they usually sit about 2mm closer to the frame than the stock big ring (depends on the stock ring) Use Drop-Stop B for all SRAM Eagle, SRAM Road and Transmission (T-Type) Flattop chains, 9, 10, and 11spd chains or 12spd KMC, Connex, Wippermann, Campagnolo. Recommendations - If you plan to ride in very muddy conditions, we recommend a chainguide or chainkeeper in addition to a clutch-type rear derailleur. Without these precautions, you may experience chaindrops and/or chainsuck.

Wolf Tooth Direct Mount Chainrings for Trek TQ E-Bike Motors are compatible with all Boost and Super Boost bikes that use the Trek TQ Motor. This brings a lightweight chainring with patented Drop-Stop® technology to e-bike chainrings for the first time. Direct Mount Chainrings for Trek TQ E-Bike Motors are machined with 7075-T6 aluminum at Wolf Tooth in Minnesota, USA. Compatibility: - Chainring is compatible with only TQ Motor drive systems - 55 mm chainline - Available in two different tooth profiles for optimal performance based on your chain type. Use Drop-Stop ST for use with Shimano 12-speed Hyperglide+ and 12spd KMC chains. Use Drop-Stop B for all 9, 10, and 11spd chains or 12spd SRAM Eagle, SRAM Flattop Road or Transmission (T-Type), KMC, Connex or Wippermann chains. DROP-STOP B - Compatible 9, 10, 11, and 12s SRAM Eagle, 12s SRAM Transmission (T-type) Flattop, 12s Campy, 12s KMC - Not compatible with 12s Shimano HG+ chains DROP-STOP ST - Compatible with 12s Shimano Hyperglide+ chain and 12s KMC chain only - Symmetric Trapezoidal (ST) tooth shape is optimized for Shimano HG+ chain Tech Specs: - Weights: 30t/64g | 32t/69g - Material: 7075-T6 aluminum - Made in the USA