When the light detects that you're on the brakes the light becomes solid like the brake lights on a car and then changes back to the previous mode when you get going again

Action Fit Retention Dial System

Cons: If you are running Campag these won't work

Cannondale

And there's no need to worry because Muc-Off Dry Lube is biodegradable*

Mons Royale Women's Diversion Merino Bike Short Sleeve Jersey - XS - MR Grunge / Black NoAusPost When the light detects thatDesigned for the longer ride and trails in between, the women's Diversion Merino Bike Jersey has a fully articulated fit that has been optimised for on bike performanceensuring that people will love riding in this new staple. Featuring their proven Merino Shift material for additional wicking and bike performance. Features Merino Wool regulates temp, wicks moisture, and resists odour On bike fit designed to move with you, with side slit and dropped