What size triathlon bike frame do I need?
Ava Richardson
Updated on February 25, 2026
What size triathlon bike frame do I need?
What’s the right TT bike size for me?
| Rider Height | Suggested Triathlon Frame Size | |
|---|---|---|
| Feet & Inches | Centimetres | Frame Size (cm) |
| 5’3″ – 5’6″ | 160cm – 168cm | 51cm – 53cm |
| 5’6″ – 5’9″ | 168cm – 175cm | 54cm – 55cm |
| 5’9″ – 6’0″ | 175cm – 183cm | 56cm – 58cm |
Can you convert a triathlon bike to a road bike?
The geometry is different on most tri frames but there are some bikes that are double-duty (Kestrels come to mind). Fit is key to making it work and due to your position on a tri bike, you may need a setback seatpost to get anywhere near a road bike fit.
Can you use a TT bike for triathlon?
TT bikes and triathlon bikes can both be used for triathlon racing. Especially for shorter races. And some just like the look of the TT bike — simple, streamlined. But if the bike portion of the race is long, especially something like a 70.3 or full Ironman distance, a tri bike will be much more comfortable.
Why are triathlon bikes heavier?
A triathlon bike is heavier than a road bike by 2- 4 lbs or 1 to 2 kg. The reason is that the aim is to make a triathlon bike more aerodynamic rather than lightweight as it is in road bikes. The triathlon bikes come with bigger aerofoils and bigger frames than the road bike.
Should I size down for TT bike?
I would consider that only 1/2 to 1 size down for my height. If you think a size 56cm is “normal”. Yes the 52cm top tube bike is a little small.
Can you put normal handlebars on a TT bike?
Make sure it is wide enough to accommodate aero bars. It will handle different than a pure road bike, but if you are just ridding it for fitness you should be ok. I’ve done road races on my mountain bike with drop bars and it worked too. Good luck!
Can you put road bars on a tri bike?
The answer is yes. On the bike leg of the triathlon, increasing your speed is all about reducing aerodynamic drag. And while there are dozens of small improvements you can make to your components and gear, the investment that gives the greatest returns is adding a good pair bicycle aero bars.
What’s the difference between a tri bike and a road bike?
How They’re Different. The most notable difference is the design, or geometry of the frame of each bike. Triathlon bikes have a steeper angle of the seat. Seats on a road bike are positioned at, on average, 78 degrees while the angle on a triathlon bike is closer to 72 degrees.
How much faster is a triathlon bike?
there have been many tests in the wind tunnel and these tests often show in an Ironman event that a TT or Triathlon bike can be up to 3kph quicker, while this is a general figure you may find this slightly more or less depending on your position, wheel choice and average speed.
Are triathlon bikes good for long distance?
Tri-bikes have steep seat tube angles and often don’t handle that well. They are made to go fast in a relatively straight line, with the rider in a very low aero position. Not a good bike for typical distance rides.
What’s the difference between a triathlon bike and a road bike?
