I want to buy a bike. I have a bike who may interest me, it is a Tri Bike 51cm. I was wondering if it was OK for me. I know that for my height 53-56 cm is better but I'm only 115 pounds. Would that be OK for me?

  • 56 even might be too small. My road bike is 58 and I'm 5'11".
    – Batman
    Sep 2, 2016 at 14:02

2 Answers 2


A 51cm frame sounds too small for you, assuming you're average limb length for your height.

You can put the saddle up really high, but that makes it a more aggressive body position, and your seat post is not as well embedded in the frame.

You don't mention your age - I'm guessing you may still be growing, in which case the too-small frame will be getting smaller as you grow.

Answer Pass on this bike - there will be another.


I am 5'10" and had the use of a 53cm while I decided what to buy. This was clearly too small - had some knee discomfort and felt "bunched up" on the bike. I bought a 58cm and can most definitely feel the difference. My arm may be a little longer than normal, but I am happy with the 58. Don't settle for one that is not the right fit.

  • Welcome to Bicycles @larry. As with all new members we recommend that you take the tour to make best use of the site, and since you're writing an answer see How to Answer also. Good to see you here
    – andy256
    Sep 3, 2016 at 3:20

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