Birzman Chain Wear Indicator - 1-12 Speed winteressential Silicone gel leg gripper

Silicone gel leg gripper

13T flat sprocket fixed with lower gears

less maintenance

What you get is graduated compression of 20-30mmHg to reduce impact related muscle fatigue

silver-black/braze-on: 110 g

Birzman Chain Wear Indicator - 1-12 Speed winteressential Silicone gel leg gripperThe Birzman chain wear indicator tool measures wear and stretching on single to 12 speed chains, so that you know when its time to replace it. A worn chain causes poor shifting performance and reduces the service life of sprockets and chainrings by wearing down the teeth. Regular checking for chain wear and a timely chain replacement prevent costly premature replacement. 11 and 12 speed chains should not be stretched more than 0. 5%. When using