Multi-tool for bikes and compact multitool

What is a multifunctional bike tool for?

A multitool is used to fix and adjust a bike away from the workshop: tightening a loosened stem, re-seating a slipped saddle, realigning a brake caliper, adjusting a derailleur stop, or cutting a bent link. It replaces the toolbox that you can’t take along, at the cost of a shorter lever arm. It fits into a saddle bag or a backpack. It does not replace tools dedicated to heavy operations, such as removing a cassette or bottom bracket.

What functions are really useful?

• Hex keys: from 2 to 8 mm depending on the model. The 4 and 5 mm are most commonly used (stem, saddle clamp, handlebars, calipers), while the 6 and 8 mm are found on crankarms and certain pedals.
• Torx bits: the T25 has become standard on brake disc screws, while the T30 is found on some transmission components.
• Flat and Phillips screwdrivers: for the stop and tension screws of derailleurs.
• Chain breaker: to remove a damaged link and close the chain, ideally with a compartment for a spare quick link.
• Spoke wrenches: for tightening a loose spoke and making a warped wheel usable until you can get back.
• Tire levers, plug and tubeless insert: to repair a puncture without needing to dismantle everything when the sealant is no longer enough.

Count the screws on your bike before comparing the number of functions: a tool with 20 functions, half of which are useless for your bike, weighs unnecessarily in your pocket.

Chain breaker, spoke wrenches, tubeless: check compatibility

The chain breaker must accommodate the width of your chain. Some claim compatibility up to 12 or 13-speed transmissions, but certain hollow-pin chains require a specific tool: the manual specifies exceptions. If your chain closes with a quick link, carry one of the correct speed, as several multitools provide a magnet or a slot to keep it.

The spoke wrenches can be identified by the size of the spoke head, most often 3.23, 3.3, or 3.45 mm, plus profiles specific to certain brands of wheels. For a tubeless tire, the reamer enlarges the hole before the insert pushes the plug into the casing. These functions are mainly found on tools designed for mountain biking and gravel.

Compact or complete: choose according to your practice

On the road, a tool with 6 to 10 functions, without a chain breaker, is sufficient for most adjustments and fits in the back pocket of your jersey, usually weighing less than 100 g. In mountain biking and gravel, where a broken chain or a cut tire can happen far from anything, a model with 15 to 20 functions, including a chain breaker and tubeless tools, is justified. When bike touring, a complete model avoids carrying multiple tools. Fixed-gear cyclists have their own models, with a 15 mm wrench for wheel nuts and a locknut wrench.

A multitool clamps less precisely than a torque wrench. On a carbon stem or seat post, tighten gradually and check the torque engraved on the part as soon as you return, using the appropriate tool.

The other tools in the workshop

For home maintenance, hex keys with handles provide better leverage, and a tool kit collects the essentials in a case. Transmission operations have their dedicated tools: chain tools to measure wear or open a quick link, cassette tools to remove cogs. All of this is gathered in the bike tools. Some specialized workshop tools are also listed on this page: check their compatibility with your equipment before ordering.

Which brands of multifunction tools to choose?

crankbrothers offers its multitools made from high-strength steel from multi-5 to multi-20; the F15 stores its 15 tools, including a chain breaker, in a magnetic case that also serves as a handle and includes a bottle opener.

Pedro's brings its workshop tool experience into its multitools: the ICM 15 and ICM 21 combine treated steel keys, two tire levers, and a composite body, while the RX Micro-9 features a 6061 aluminum body, and the Trixie, designed for fixed gear, attaches to water bottle mounts with its locknut wrench and 15 mm key.

Topeak has thirty functions in the Mini PT30, including a removable chain breaker compatible with up to 12 speeds, a clamp for quick links, and the necessary tubeless repair kit; the Ninja Master+ PT30 stores the same tool in a case attached under the bottle cage, and the range includes everything from Mini 6 to Alien II and Alien III.

Birzman won an Eurobike Award for its M-Torque, which signals a click for a 5 Nm tightening on its 4 and 5 mm bits and its Torx T25; the brand also offers the Cicada, Diversity, and E-Version.

Lezyne designs and manufactures its multitools in-house: the RAP II mounts its anticorrosive treated steel bits between two machined aluminum plates that magnetically hold a quick link, while the SV Pro switches to stainless steel.

Multifunction tools on sale

The multitools that have a change in color or version go to the clearance sale, and the newly arrived models wait in the new arrivals. To replace a worn tool or keep a second one at home, also watch for Black Friday.

Frequently asked questions

What multitool should I take cycling?

One that covers the screws on your bike: check the sizes of hex keys and Torx bits on the stem, seat post, calipers, and derailleurs. Add a chain breaker if you’re cycling far from roads, and tubeless tools if your tires are equipped with them.

Can a multitool replace a torque wrench?

No, it allows for fixes but does not measure the tightening, except for a few models that indicate a fixed torque. For carbon parts and sensitive tightenings, check the torque specified by the manufacturer using a torque wrench.

Is a multitool's chain breaker suitable for a 12-speed chain?

Only if it is noted as compatible with that chain width. 12-speed chains are most often closed with a quick link that needs to be replaced after opening: carry a new link of the same speed with your tool.

Where to store a multitool on the bike?

In a saddle bag, with the inner tube and tire levers, or in the back pocket of the jersey for a lighter model. Some tools can be attached under the bottle cage or on the frame inserts, freeing up the pockets.

How to maintain a multitool?

Dry it after a ride in the rain, then put a drop of oil on the joints and the chain breaker screw. Periodically tighten the axis that holds the keys, without locking it, so they stay firm without being difficult to pull out.