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sizing question(5 posts)

sizing questionGall
Mar 19, 2002 5:01 PM
hello,

i also posted this in the triathlon board. i thought it might get more attention here....

i ride a 52cm trek road bike. i am looking to buy a y foil and i think i found one but in a 48cm. with the foil i would be turning it into a TT bike etc.

is it better to get a smaller frame with a shorter top tube when setting up a bike with aerobars?

thanks!
What size bike WERE you looking for?Spoke Wrench
Mar 20, 2002 6:22 AM
It sounds to me like you are asking for permission to buy a bike that you think might not fit you well. You're not going to get it from me. Fit affects your performance, comfort and enjoyment every single minute that you are on the bike. Fit is the first cut. Nothing else even comes slose in importance. If the size isn't right, look no farther, the bike just isn't right for you.

There are lots of used bikes out there that have cool frames, great component groups and attractive prices. If they don't fit, however, its just something that you have to sell before you can buy the bike you really need.
re: sizing questionjtolleson
Mar 20, 2002 8:27 AM
That's a pretty significant difference, and 48 cm with 700cc wheels is the borderline in my mind of too much toe overlap. I'm no whiz on TT setups, but I've used aerobars for long plains rides (Wyoming's Tour de Prairie, for example) and never had top tube length issues.
re: sizing questionGall
Mar 20, 2002 9:28 AM
hello,

well the deal is that the y foil size 48cm compares pretty close to the 52cm 5200. the top tubes are almost the same size.

so what i was asking was what areas should i compare in size with my 5200 when looking at a bike. should i try to get the TT etc the same on both bikes no matter what the over all size of the bike is listed as?

does this even make sense :-)
re: sizing questionjtolleson
Mar 20, 2002 11:57 AM
Similar effective TT lengths will definitely be important, but the other problem people have with small frames is the drop from saddle to bars. If you jack your saddle up to get the right leg extension, you may find that the bars are too low.

If this has a quill stem, that's no biggie, but on a threadless set up you only have so much to work with. Plus once you dump money on stems and spacers, or a set back seatpost, or whatever you need to make the geometry right, the bike may or may not still be a good deal.