How-To
What to Actually Carry: Flat Repair Kit and Multitool
A flat on your commute isn't a big deal if you're carrying the right handful of small items. Here's what actually earns a spot in the kit.
A flat tire is one of the most common things that can strand a bike commuter, and it's also one of the cheapest to prepare for — a real repair kit fits in a small saddle bag or jersey pocket and costs a fraction of a single rideshare home. Here's what actually belongs in it, and what to look for in a multitool without overbuying.
The Core Flat Kit
At minimum: a spare tube that matches your wheel size and valve type (Presta vs. Schrader — check your current tube before buying), tire levers to get the tire bead off the rim without pinching the new tube, and a way to inflate it — either a compact hand pump or CO2 cartridges with an inflator head. CO2 is faster and lighter; a hand pump never runs out and works for topping off pressure on days you're not fixing a flat at all.
A patch kit is a reasonable backup or primary option if you'd rather patch than swap tubes, but valve type and tire bead stiffness (some tires are much harder to remove by hand than others) matter more to a smooth roadside fix than most people expect — it's worth practicing a tube swap once at home before you need to do it for real on the side of the road.
What a Multitool Actually Needs
A good commuter multitool covers the hex sizes your bike actually uses (commonly 4, 5, and 6mm for stem, seatpost, and brake/derailleur adjustments), a flathead and Phillips screwdriver, and — if you run a chain, not a belt — a chain breaker for an emergency chain repair. Beyond that, most of the extra tools bundled onto larger multitools (spoke wrenches, bottom bracket tools, disc-brake-specific bits) are rarely used on the road and mostly add weight and cost.
Match the multitool to your specific bike's hardware rather than buying the tool with the most total functions — a 15-function tool that's missing the one hex size your seatpost clamp actually uses is less useful than a simpler tool that covers exactly what your bike needs.
- Spare tube matched to your wheel size and valve type
- Tire levers
- Hand pump or CO2 inflator (or both)
- Multitool covering your bike's specific hex sizes, plus a chain breaker if you run a chain
Where to Keep It
A small saddle bag mounted under the seat keeps the kit on the bike at all times, so it's there even on days you forget to think about it — which is exactly when you'll need it. Loose items in a backpack or pannier work too, but they're easier to accidentally leave behind on the one day you grab a different bag.