Quoted post said:Originally posted by boudreaux
Actually you don't know,but have just had some hooey blown in you. Alot of it is personl preference in additiion to some other factors. Some do better on bigger,others on smaller,within reason. I see it just the opposite, and prefer smaller.I've ridden too small and too big and too big just feels awkward, and terer is nothing you can co about it. A bit small can cause problems getting the bars high enough if you have flexibility problems. So, just remember, everyone is different.
I agree that it depends on the rider's build and preferences. I am 6'3" with a long torso, and reach, and a relatively short inseam. Looking at just my inseam, I'd probably be fit on a 57cm bike. But, even with the 57.5cm toptube on my 59cm litespeed, I still need a 130mm stem to get the proper reach! If I had a 57cm frame, I could never get the proper reach.
Get a good bike fit. Figure out what you need in terms of a toptube/stem combination. Then, work backwards from stem length. In other words, assuming a stem lenght in the 110-120mm range, figure out what length toptube you can use to give yourself the proper reach. I recommend initially using a 110 or 120, if possible, because then you can go longer if you decide later that you prefer a more stretched out riding position, or shorter if you prefer a more compact position. This may not, however, be possible, and there is nothing wrong with using a 130mm stem, especially on a 57/59cm bike if it is necessary.
Lastly, while all the rage is to ride compact frames, I personally think it stupid, especially for larger riders. While you may gain some stiffness in the frame itself, any incremental gains are offset by flexing in the seatpost. Moreover, the drop from the handlebars to the stem tends to be too drastic for most riders. As a rule, I wouldn't ride any bike that had more than 5" (12.5cm) of seatpost exposed.
just my 2 cents!