Tri Bike Sizing?

[SSP]

I'm 6' tall and currently ride a 58 cm Trek road bike.

I'm in the market for a Tri/TT bike (I want one that's legal for both USCF and USTA).

Question: is tri/TT bike sizing much different than standard road bike sizing? If so, should I be looking for a smaller or large frame? Or, is the answer that "it depends"?

TIA.

[cslone]

Really, it depends. MOST of the time it will be a smaller frame, sometimes the same size. I can positively say it will never be larger than a properly fit road bike. Just as road bike companies have different measurements, the same goes for tri bikes. The rule of thumb I've always gone by is 2cm shorter on the toptube. That has worked well for my friends that don't want to be fitted, but it's not exact.

You have to take into account that your torso will be farther over the front of the bike, and your elbows will be on the pads, so a shorter toptube(or stem in some cases) will provide this.

And for comparison, I'm just over 6' and ride a 56 road bike with a 120 stem, and a 54 tribike with a 76 degree seattube angle, pushed forward to around 80 degrees, with a 110 stem.

[james57]

Go to wrenchscience.com, select the TT or TRI sizing calculator, input your body measurements and this should at least give you a point of reference.

[james57]

This one is even better ..

http://www.competitivecyclist.com/za/CCY?PAGE=FIT_CALCULATOR_INTRO&INTRO_LINK=NOREDIR&SITE.CODE=TRI