5 and 6mm hexes

Volume (Per Stroke): 90

BBS02 Mid Drive motor lockrings

Recommended Chain: PC-1090R

JetBlack S1 Sport Magnetic Trainer with Lite App Envelope Shipping 5 and 6mm hexesThe JetBlack S1 Sport Trainer is a magnetic resistance bicycle trainer that is perfectly tuned for fitness riding The S1 is an economy package that has a fixed resistance mode When used with the full range of JetBlack sensors You'll be able to fine tune your entire training experience You can even upload your session to Training Peaks and Strava All JetBlack trainers come with a lifetime warranty. Out of the box, it only works with QR end caps.