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How important is Frame Size?(6 posts)

How important is Frame Size?spazzion
Jul 19, 2001 8:10 AM
HI-
I am buying my first road bike and I found a decent bike at a really good price. The only problem is the frame is 47 cm and I fit perfectly on a 50 cm. I will be using this bike for commuting to work and I want ot get into triathlons. I am 5'5 and 125 lbs. By increasing the length of the stem and having a high seat, do you think that there are ways to make this bike work for me? It is a little small, but it is the best option that I have at the time. Any suggestions? Thanks
Don't buy a frame that doesn't fit!sidley
Jul 19, 2001 8:38 AM
It will cause you pain and possible injury. 50 cm is probably too small for you, certainly 47 would just be a disaster.
re: How important is Frame Size?LC
Jul 19, 2001 8:57 AM
I have one frame that is 2 sizes smaller than the rest and it still fits fine because the top tube is about the same length as my other bikes. I do have to have the seat adjusted higher though and a stem with more rise. The main problem is that the stem might be too low and you might have to get a longer stem with more rise. Until you ride a bike for a long time, you will not really know what size you need. Even those custom sized bikes that people pay top dollar for may not fit because it is someone elses idea of "proper fit". You may find that the 47cm fits better than the 50cm and that one brands 47 is really the same as another brands 50cm. For a triathlon bike you would probally want one that is little shorter on the top tube anyway, so that when you get aerobars it will put you in a better position.
Not enough information...Cima Coppi
Jul 19, 2001 9:14 AM
You really have not provided us with enough informantion to know if a 47cm is too small. Your height and weight mean nothing in frame sizing; what really matters is your inseam length, arm length, and upper body measurements (breast bone to crotch). Also, we would need to know the top tube length on the frame in question to help you make an informed decision. NEVER buy a frame that does not fit!!

Check out: http://www.coloradocyclist.com/bikefit/ for how these measurements are to be taken.

CC
very!quinroo
Jul 19, 2001 9:40 AM
ii believe you asked this question a few days ago, so it sounds like you really don't want to pass up on this good deal you've found! but i would be really wary of buying it if you "fit perfectly on a 50cm". have you ridden the 47cm? have you ridden any other 47cm? how do they feel? try riding a 47cm in the same brand at your LBS if you can't get to that one, have them raise the seat and all and see if it feels ok. if you're having a hard time passing it up because of how good a deal it is, remember that there are a lot of other great deals on bikes that will fit you out there. check the classifieds, here and on triathlete.com. find a last-years model bike that you like and look for it on closeout. you will be able to find a bike that fits for a good price. and you probably won't have to wait a while either, some hardcore searching is all thats needed (if you want more places for classifieds, email me-- i recenly poured through quite a lot)! buying a bike that does not fit is never the best option.
re:What is it that makes this bike such a good deal?Spoke Wrench
Jul 20, 2001 7:58 AM
Fit is the one thing that affects both your performance and your enjoyment every single moment that you are on the bike. What could possibly be more important than that?