Best Bike Multi-Tools to Fix It and Keep Riding (2026)
Three proven multi-tools, from a full-featured trail kit to a pocket-sized hex set, and which functions matter on the road and trail.
Why Carry a Multi-Tool?
Bolts loosen, saddles slip, chains break and derailleurs get knocked out of line. A bike multi-tool puts the tools for these common fixes in your pocket so a small problem doesn't end your ride. The trick is choosing one that matches the bolts on your bike: most need 4, 5 and 6 mm hex keys, many brakes and rotors use T25 Torx, and mountain bikers should carry a chain tool.
Crankbrothers M19
Best full-featured
- Hex 2 to 8 mm
- Chain tool for 8 to 12 speed
- Spoke wrenches and screwdrivers
Topeak Mini P20
Best for mountain bikes
- 20 functions
- CrMo chain breaker
- Master link tool
Park Tool IB-2
Best compact
- Hex 1.5 to 8 mm
- T25 and flathead
- Compact fold-up design
Multi-Tools Compared
| Tool | Hex Keys | Chain Tool | Extras |
|---|---|---|---|
| Crankbrothers M19 | 2, 2.5, 3, 4, 5, 6, 8 mm | Yes, 8 to 12 speed | 8 and 10 mm wrenches, spoke wrenches 0 to 3, Phillips #1 and #2 |
| Topeak Mini P20 | 2 to 6 mm | Yes, CrMo | 8 mm socket, T15/T25, spoke wrenches, master link tool |
| Park Tool IB-2 | 1.5 to 8 mm | No | T25, flathead |
The Best Bike Multi-Tools
1. Crankbrothers M19
The M19 is a full roadside kit in one tool: hex keys from 2 to 8 mm, 8 and 10 mm open wrenches, spoke wrenches (sizes 0 to 3), Phillips #1 and #2 screwdrivers and a chain tool for 8 to 12 speed chains. It's a good choice if you want to be ready for almost anything.
Good to Know
- Very complete
- Covers modern chains
Watch Out For
- Heavier and bulkier than minimal tools
2. Topeak Mini P20
Topeak packs 20 functions into a forged aluminum body, including 2 to 6 mm hex keys, an 8 mm socket, T15 and T25 Torx, spoke wrenches, a CrMo chain breaker and a master link tool for opening and closing quick links on the trail.
Good to Know
- Master link tool included
- Great for mountain bikes
Watch Out For
- No 8 mm hex key (has an 8 mm socket)
3. Park Tool IB-2
A compact fold-up tool from the bike-shop tool maker, with hex keys from 1.5 to 8 mm, a T25 Torx and a flathead screwdriver. It covers most adjustments without the bulk, which suits road riders and commuters.
Good to Know
- Small and light
- Wide hex range
Watch Out For
- No chain tool
Which Functions Do You Need?
| Function | Used For | Who Needs It |
|---|---|---|
| 4, 5, 6 mm hex | Stem, seatpost, saddle, brakes, shifters | Everyone |
| T25 Torx | Disc rotors, some brakes and stems | Most disc-brake bikes |
| 8 mm hex | Some pedals and crank bolts | Many riders |
| Chain tool | Fixing a broken chain | Mountain bikers, long rides |
| Spoke wrench | Straightening a wobbly wheel | Mountain and touring riders |
| Screwdrivers | Derailleur limit screws | Riders with derailleurs |
Build a Ride Repair Kit
- Multi-tool
- Spare tube or tubeless plug kit
- Tire levers
- Mini pump or CO2 inflator; see bike pumps
- Spare quick link for your chain speed
- A few zip ties
For bigger jobs at home, a bike repair stand helps a lot. Learn the basics with how to adjust bike brakes and how to remove a bike crank.
Frequently Asked Questions
What should a bike multi-tool have?
At minimum the hex sizes on your bike (usually 4, 5 and 6 mm), a T25 Torx if your brakes or rotors use it, and a chain tool for longer rides.
Do I need a chain tool on my multi-tool?
For mountain biking and long rides, yes. A broken chain can end your ride without one. Carry a spare quick link too.
Which is better, a big or small multi-tool?
Small tools are lighter and fit a saddle bag; bigger tools have more functions and more leverage. Match it to your bike and the rides you do.
Can a multi-tool replace a home tool kit?
No. Multi-tools are for roadside fixes. At home, proper tools give better leverage and are less likely to damage bolts.
How do I carry a multi-tool?
In a saddle bag, jersey pocket, hydration pack, or a frame-mounted tool holder.