If you're searching for "how to attach a race number to your bike," you're probably either a few days away from your first race or you've crossed the finish line with your number hanging by a thread and you don't want it to happen again.
In this guide, we cover everything: what the rules say, where the race number goes depending on the discipline, the most common mistakes that damage the frame, and the cleanest and most durable way to solve this once and for all.
Where does the race number go on the bike?
The answer depends on the discipline:
MTB (XCO, XCM, marathon)
In mountain biking, the numeric race number is placed on the front, visible from the front. It is usually located between the handlebars and the head tube, or attached to the handlebars. Some events also require a rear number, but the front one is almost universal in XC.
Triathlon and Duathlon
In triathlon, there are two race numbers: one body number (on the race belt) and a numbered plate on the bicycle, which usually goes on the seat post, visible from the rear. It is mandatory in most federated competitions.
Road and Gravel Cycling
In cyclotourist events or rides, the bike's race number usually goes on the frame, attached between the head tube and the top tube. In federated races, UCI rules specify minimum position and size.
Practical tip: Always read your event's regulations in advance. Each organization may have specific requirements regarding the position, size, and attachment method of the race number.
The 4 most common mistakes when attaching the race number
1. Using nylon zip ties directly on the frame
Single-use zip ties are cheap and found in every drawer, but they have a serious problem: they rub the paint. With the movement and vibration of the bike, the plastic of the zip tie acts like sandpaper on the frame's finish. On carbon monocoques or special paints, the damage can be permanent in a single event.
2. Using elastic bands without any guide system
Elastic bands allow quick attachment and removal of the race number, but they don't immobilize it. On technical terrain, the number oscillates, can lean against the head tube and scratch it, and on hot days, the bands degrade and can break mid-race.
3. Punching holes in the race number in places that weaken it
If you punch holes in the corners of the race number, the paper or plastic ends up tearing outwards with tension. The correct way, if you're going to punch holes, is to do it in the center of each side, but even then, the race number ends up deformed.
4. Attaching the race number to cables or hoses
A classic on modern bikes with few reference points on the front: looping the zip tie around the brake or gear cable. Besides damaging the cable's coating over time, it limits travel and can interfere with the system's operation.
What options are there for attaching the race number?
Reusable zip ties
Better than single-use ones, but they still put pressure on the frame and require tools to adjust them correctly.
Generic elastic bands and Velcro
Economical, but without real immobilization of the race number. Valid for less demanding events or on flat roads.
Double-sided tape
Some cyclists stick the race number directly to the handlebars or tube. It works for one-off events, but leaves adhesive residue and isn't suitable for the next race number.
Specific race number holder
The most professional option and, in the long run, the most economical. A holder designed for this use is mounted once, lasts entire seasons, and doesn't damage anything. The best ones utilize existing anchor points on your bike.
The smartest solution: leverage the mounts you already have
Here's the trick very few people know: if you already have a GoPro or Garmin mount on your bike, you can hang your race number directly there without adding anything new to the frame or using zip ties.
Pedra race number holders are 3D printed in Alicante and work exactly like this:
→ Front Race Number Holder – compatible with GoPro mount If your integrated stem, handlebars, or GPS mount has a GoPro mounting point (increasingly common on modern XC handlebars), you simply snap the race number holder into that point. No tools, in seconds.
→ Rear Race Number Holder – compatible with Garmin mount If you have a Garmin GPS mounted on your seat post or rear area, this holder uses the same mount and positions the race number as required without rubbing anything.
The result: the race number stays fixed, without vibration, without touching the frame, and can be attached and removed in less than 30 seconds.
Quick guide: which holder you need according to your bike
| Situation | Recommended solution |
|---|---|
| You have a GoPro mount on your handlebars or stem | Pedra Front Holder |
| You have a Garmin GPS on your rear seat post | Pedra Rear Holder |
| You participate in triathlon, need a rear number | Pedra Rear Holder |
| You race in a club and do many races | Pack of 10 front holders |
| You don't have any standard mounts | Consult option with universal clamp |
Frequently asked questions about bike race numbers
Does the race number always have to go on the front? It depends on the event. In XC and marathon, it's usually front. In triathlon, a rear number is mandatory during the bike segment. Read the rules for each race.
Can I attach the race number to the bike with safety pins? Safety pins are for attaching the race number to your jersey, not the bike. There's no fabric on the frame to pin them to, and they could damage the finish or come loose with vibrations.
Are race number holders universal? The best ones are designed to utilize existing standard mounts (GoPro quarter-turn, Garmin mount). If your bike has one of these mounts, compatibility is immediate.
How much does a race number holder weigh? Well-designed 3D printed holders weigh between 10 and 25 grams. Less than a metal zip tie with its screw.
Can I use the same holder on several bikes? If all of them have the same mounting standard, yes. You simply unclip it from one and mount it on the other.
Summary
Attaching the race number to your bike seems trivial until you do it wrong and end up with a scratched frame, a torn race number, or sabotaged concentration before you even start. The solution exists, costs less than 15 euros, and installs in seconds if you take advantage of the mounts you probably already have.
View all Pedra race number holders → pedra.bike/collections/porta-dorsales
Pedra Components. Made in Alicante. Free shipping in Spain from 30 €.
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