The Crank Brothers M17 packs seventeen functions into a folding tool that fits in a jersey pocket or saddlebag. The body is high tensile steel with textured side grips that provide purchase even when you're wearing gloves or your hands are wet. At 89mm long and 168 grams, the M17 sits in the middle of Crank Brothers' M-Series lineup, balancing capability against packability.

The hex wrench selection covers most bolts you'll encounter on a modern bike. Sizes 2, 2.5, 3, 4, 5, 6, and 8mm handle everything from derailleur limit screws to crank arm bolts. A T-25 Torx fits rotor bolts and some stem faceplates. Phillips #2 and flat #2 screwdrivers round out the fastener tools. The 8mm and 10mm open wrenches work on pedal flats and older component hardware.

Four spoke wrenches cover the common nipple sizes: #0, #1, #2, and #3. If you develop a wobble mid-ride, you can at least true the wheel enough to get home without brake rub. The chain tool breaks and rejoins 8, 9, 10, 11, and 12-speed chains, so it works across the full range of modern drivetrains. For quick link chains, you can still use the tool to remove a damaged link and shorten the chain to limp back.... Read More