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Old 06-11-09, 07:40 AM   #1
Spin4fun
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Please Help...TT bike size (everyone has an opinion, which is right)

I am 5 10 with an inseam of 31...I currently ride a 54cm Madone and am looking to buy a frame for a TT bike...I have a great opp to get a Specialized Transition Pro that is also a 54...

I have heard, size down for a tri..Ive heard keep the same size...what should I do

One thing I read (which was probably the most logical point that I have seen is ...
Your tri and road bike should be the same size...The point was Tri Bike frames are designed for TT therefore they are already putting your body in different angles than your road bike...So if you ride a 54 road bike and size down for tri, you could potentially be going down 2 or more sizes since the tri is made differently...

Any thoughts
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Old 06-11-09, 07:47 AM   #2
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I'm 5'9" with the same inseam. I ride 54 in road sizing. I was professionally fitted once and measured by a different shop before buying my current tri frame. It'a a 52. Fits perfectly.

I suggest you look at the pro riders. Small frame and a lot of seatpost is the norm. A tri isn't really "made differently" as much as it's optimized for the aero position - where your bones actually support your form versus depending on core strength.
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Old 06-11-09, 10:42 AM   #3
RonH
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Welcome to BF.

This is the Introductions forum.
Ask the folks in the Road Cycling forum or the Triathlon forum for help on the bike and sizing.
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Old 06-11-09, 12:20 PM   #4
king-tony
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Agreed, you'll get better response on the road or tri forum. As for frame size, generally speaking, go with the smallest frame size that fits. You can't use top tube length as the standard for measurement and that is why stack and reach are commonly used. Also, if the bike is for TT's you will be wanting a more aggressive position compared to a long distace triathlon position.
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Old 06-12-09, 11:51 AM   #5
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Welcome to bike forums...
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