Crankbrothers

Crankbrothers M19 Multi-Tool

The M19 packs the bits most riders actually need — hex keys from 2 to 8 mm, Torx T25, screwdrivers, spoke wrenches and a chain breaker — into a tool small enough for a jersey pocket or a top tube bag. The build is solid with steel bits and a flask-style case. On an e-bike, the common roadside jobs are tightening a loose stem, adjusting a rattling rack bolt, or re-seating a dropped chain, and the M19 handles them. The 8 mm hex is handy for some crank bolts and axle nuts on folding bikes. The chain breaker works but is slow; it is there for emergencies.

Best for: Saddle bag or top tube bag carry · Riders who want a chain breaker on board · Stem, rack and accessory adjustments