How to Attach a Race Number to a Trisuit | DTR

Attach a triathlon race number to a trisuit with a race belt rather than safety pins: the belt clips on over the suit, keeps the number flat and leaves the fabric untouched. This guide covers belt versus pins, which way round the number goes, and how to set it up so it never costs you time in transition.

Race belt or pins: which should you use?

Use a race belt. A belt holds the number at your waist without piercing the fabric, so there are no pulled threads or pin holes in a technical lycra trisuit, and you can move the number from your back to your front in seconds. Pins are a fallback for races that insist on them. DTR does not sell race belts, so any triathlon belt that fits your waist will do.

Which way round does the number go?

It depends on the race and the federation, so read the athlete guide before race day. A common pattern: the number sits on your back on the bike and on your front on the run, with separate stickers for the bike frame and helmet. A belt makes that swap a one-second job as you leave T2. Some events only require it on the run, so check before you set anything up.

How to set up a race belt

Thread the number onto the belt through the pre-punched holes or loops, clip the belt round your waist over the trisuit and slide the number to your back for the bike. Set the belt snug enough that it cannot ride up, with the clip off to one side. Put the whole setup on at home first, in your transition kit routine, not in the changing tent.

What if the race requires pins?

Pin only where the rules demand it. Use thin pins at the four corners, keep the fabric slack rather than stretched so it does not pucker, and avoid pinning through the seams or the chest area where the suit takes the most tension. Expect a few tiny holes afterwards: a belt avoids that entirely, which is why most triathletes use one.

Will a belt rub or move on the bike?

A snug belt over a well-fitted trisuit should not rub. If it does, the suit is usually the issue, not the belt: see how a trisuit should fit and how to prevent chafing. Test the setup on a brick session, not for the first time on race morning.

Race-morning checks

Pick up your number at registration, read the placement rules, thread the belt and test the swap once. Keep it with your race kit so it is in the bag before you leave. For a short first race, our sprint triathlon kit guide and first triathlon guide cover the rest of the list, and washing the suit properly after race day keeps the fabric in shape.

FAQ

Can you pin a race number to a trisuit?

You can, but it is not ideal. Pins can leave holes or pull threads in technical fabric. A race belt avoids both and is the standard choice.

Does the race number go on the front or back?

Usually the back on the bike and the front on the run, but rules differ by race. Check the athlete guide.

Do I need a race belt?

Not required by every race, but it is the cleanest way to carry a number and to swap its position between bike and run.

Ready to pick your race suit? The DTR trisuits are at /collections/trisuits.

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DTR — performance cycling and triathlon apparel, designed and developed in Ukraine.