This extremely handy little dandy will add or subtract 1/2 a link (1/2") from your chain, allowing you to move the axle 1/4" forward or backward to dial in chain tension or slam that rear wheel.

Available in two versions - black works with all standard 1/8" KMC chains (S1, Z410), nickel plated works with K1 Wide (K710) and K1SL Wide (K710SL) chains.

The standard (black) version is also compatible with Izumi 410 ECO and Miche 1/8" track chains.