BMX - frame sizing factors

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mx_599
03-04-06, 06:51 PM
1) does height of the individual really matter that much?
2) what other factors should one consider?
3) the range seems narrow...not as critical as a MTB sizing. is this true? so what is actually changing? the wheelbase?

i am 5'4" and was probably going to get a 20" frame...but what is so different than a 21" frame? would it hinder me in any way to have a 21"?

KinetikBiker
03-04-06, 07:04 PM
Your frame should suit the type of riding you do and your size and style...



Since your 5'4 i would get a 20.5" tt nothing bigger.
snugent
03-04-06, 08:56 PM
if you got a frame that was too big, it would be harder to do things on your bike that you sould normally be easy on a bike that fits you (manual, jump). The 21"tt would be too long for you, I agree with kinetikbiker that 20.5" would be as long as you should go.

mude
03-05-06, 07:32 AM
then why are you getting a 20.75...?
enormungus
03-05-06, 10:56 AM
im 5'4" also and i ride a 20" STA. i rode my friends 21" STA and it just didnt feel right. it really does make a difference
KinetikBiker
03-05-06, 11:05 AM
then why are you getting a 20.75...?
if your talking about me, thats because im like 5' 7"ish
hypersnazz
03-05-06, 02:53 PM
The longer the frame is, the longer your wheelbase becomes, and the more stable the bike gets (to a point). Shorter riderds have less leverage against a longer frame and taller riders sit higher between a smaller wheelbase on a short frame.

Other factors to consider are things like HT angle and rear triangle length. Like a mountain bike, road bike, anything, head tube angle translates directly into how quick or stable the steering is. And a short rear triangle puts your weight further over the rear tire...making steering and front wheel moves trickier but rear wheel stuff easier.