If you're searching for "how to attach a race number to your bike," you're probably just days away from your first race, or you've crossed the finish line with your race number hanging by a thread and don't want a repeat performance.
In this guide, we cover everything: what the rules say, where the race number goes depending on the discipline, 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 bike's numerical race number is placed at the front, visible from the front. It's usually positioned 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 a race belt) and a numbered plate on the bike, usually on the seatpost, visible from the rear. It is mandatory in most federated competitions.
Road cycling and gravel
In cyclotouring events or marches, 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 for the position, size, and attachment method of the race number.
The 4 most common mistakes when attaching your race number
1. Using zip ties directly on the frame
Single-use zip ties are cheap and found in every drawer, but they have a serious problem: they scratch 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 monocoque frames or special paints, the damage can be permanent in a single race.
2. Using elastic bands without any guide system
Elastic bands allow you to attach and remove the race number quickly, but they don't hold it firmly in place. On technical terrain, the race number will oscillate, it can rub against and scratch the head tube, and on hot days, the elastic 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 will eventually tear 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 attachment points at the front: looping the zip tie around the brake or gear cable. Besides damaging the cable's coating over time, it restricts movement 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 exert pressure on the frame and require a tool to adjust them correctly.
Elastic bands and generic velcro
Economical, but without real immobilization of the race number. Valid for non-demanding races or on flat roads.
Double-sided tape
Some cyclists stick the race number directly to the handlebars or frame. It works for one-off events, but it leaves adhesive residue and isn't suitable for the next race's number.
Specific race number holder
The most professional option and, in the long run, the most economical. A purpose-designed holder is mounted once, lasts for entire seasons, and causes no damage. The best ones utilize existing anchor points on your bike.
The smartest solution: leverage existing mounts
Here's the trick very few people know: if you already have a GoPro or Garmin mount on your bike, you can attach 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, handlebar, or GPS mount has a GoPro mounting point (increasingly common on modern XC handlebars), simply snap the race number holder into place. No tools, in seconds.
→ Rear Race Number Holder – compatible with Garmin mount If you have a Garmin GPS mounted on your seatpost or rear area, this holder uses the same mount and positions the race number according to regulations without rubbing against anything.
The result: the race number stays put, without vibration, without touching the frame, and can be removed and reattached in less than 30 seconds.
Quick Guide: Which holder do you need for your bike?
| Situation | Recommended solution |
|---|---|
| You have a GoPro mount on your handlebar or stem | Pedra Front Mount |
| You have a Garmin GPS on your rear seatpost | Pedra Rear Mount |
| You participate in triathlons, you need a rear race number | Pedra Rear Mount |
| You compete in a club and go to many races | Pack of 10 front mounts |
| You don't have any standard mounts | Consult for universal clamp option |
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 at the front. In triathlon, a rear number is mandatory during the bike segment. Read the regulations for each race.
Can I attach the race number with safety pins to the bike? Safety pins are for attaching the race number to your jersey, not to 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 multiple 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 your 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 leverage the mounts you probably already have.
See 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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