If you own the Park Tool TSB-4

What does it fit

Backing plate material: The EXOTherm 2 compound features a finned alloy backing plate

Wheel size compatibility: There are model for both 27

If it drops into the chain

Deity Copperhead Stem - 1 1/8th Inch Steerer - 31.8mm - 42mm - 0 Degree - Silver Exclusive If you own the ParkDEITY's goal with the all new Copperhead 42mm length steerer mounted stem was to design a lighter sidekick to their beloved Cavity Stem, but the results delivered a stronger, refined, and lighter super hero that they just could not break. All their designs are tested to failure, but the Copperhead refused to give up! After millions of cycles on both stress and impact testing, this stem refused to give an inch. Don't get it confused the Copperhead is