An accurate way to check for wear of roller and pin on chains
1% of wear is enough to affect chainrings and sprockets, and allow shifting performance to deteriorate
Just insert the chain Checker's pins into two links, press the swing arm gauge, and then check the gauge window for an accurate reading
Reads wear from 0.25% to 1%
5,6,7,8,9,10,11 and 12 speed compatible
Made in the USA and covered by Park Tool's legendary limited lifetime warranty