不用估,不要浪费金钱,使用parktool的Chain Wear Indicator,非常平宜USD15。骑了3000km, record 连条新的一样(0.25~0.5%),那里会这麽容易坏!
A worn chain shifts poorly and wears sprockets at an accelerated rate. The CC-3 is a "go, no go" gauge designed to accurately indicate when a chain reaches .75% and 1% wear, the points at which most chain manufacturers suggest replacement. Made from precision, laser cut steel. Fits derailleur and one speed chains including 9 and 10 speed.