Accessories

Multi-Tools

Compact hex/Torx tools with chain breakers for on-the-go adjustments.

A multi-tool lives in your bag for the day a stem twists in a crash, a rack bolt works loose, or a brake lever rotates on the bar. E-bikes add a few wrinkles: heavier frames and hub motors use bigger, tighter fasteners, many components use Torx rather than hex, and there is wiring you want to avoid snagging. The right tool covers the sizes on your bike and has enough leverage to actually turn them.

Start by walking around your bike. Typical e-bike fasteners include 4, 5 and 6 mm hex for stems, seat clamps, racks and brake calipers; Torx T25 for rotor bolts and many stem and lever bolts; an 8 mm hex for some crank bolts; and often a Phillips or flat screwdriver for derailleur limit screws and accessories. Many hub-motor bikes use 18 or 19 mm axle nuts that no multi-tool handles, so if your wheels are bolted on, carry a compact wrench or a dedicated axle tool separately.

Chain breakers are worth having on a tool if your bike has a chain, and a spare quick link for your chain speed makes the repair complete. Beyond that, more functions mean more weight and bulk; a tool with 10 to 12 well-chosen bits is usually better than one with 25 you never use. Look for side-loaded bits that reach recessed bolts, a body that gives you some leverage, and steel that does not round out. Carry it in a frame bag or trunk bag where you can reach it.

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Multi-Tools

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

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How to choose multi-tools

Bit coverage

At minimum 2 through 6 mm hex, an 8 mm hex, T25 Torx, and a flat and Phillips driver. Walk your bike and confirm the sizes you actually need; e-bikes vary more than pedal bikes.

Leverage and reach

Short tools cannot torque a 6 mm bolt properly. Look for a body long enough to grip, bits that extend far enough to reach recessed stem and rack bolts, and a shape that clears cables.

Chain breaker and quick-link

A chain breaker plus a spare quick link for your chain width turns a broken chain into a five-minute fix. Make sure the breaker matches your chain speed.

Build quality

Hardened steel bits, tight pivots, and a frame that does not flex. Cheap tools round bolt heads, which turns a small fix into a shop visit.

Extras that matter

Tire levers, a spoke wrench, a valve core tool and a small knife are useful additions. Skip bottle openers and things you will not use.

Frequently asked questions

What sizes do I really need for an e-bike?

Most e-bikes use 4, 5 and 6 mm hex and T25 Torx across the cockpit, rack and brakes, with 8 mm for some crank bolts. Hub-motor axle nuts are often 18 or 19 mm and need a separate wrench. Check your bike.

Do I need a chain breaker?

If your bike has a chain and you ride far from home, yes. Pair it with a quick link for your chain speed. Belt-drive bikes do not need one.

Can a multi-tool remove a hub-motor wheel?

Not usually. Bolt-on hub motor axles use large nuts, often 18 or 19 mm. Carry a compact wrench sized for your nuts or a dedicated axle tool if you expect to pull the wheel on the road.

Where should I keep the multi-tool?

In a top-tube bag, frame bag, or trunk bag where you can get to it without unpacking. Some riders strap a small tool to the frame or under the saddle.