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bike fit...(7 posts)

bike fit..._Marty_
Feb 22, 2002 11:34 AM
on my bike, when in the drops.. or on the hoods.. i can see the axle in front of my handlebar/stem clamp.. longer stem to correct? i know the fram isnt the short culprit.. its a 60cm.. i have only about 1 in clearance.. so it has to be in the stem right? its about 100 mm quil.. give or take a few mm.. any help would be nice.. thanks
re: bike fit...guido
Feb 22, 2002 12:44 PM
This might be a little off the wall, but if your top tube is 60 cm. then the seat tube must be 60 cm, too, or a tad longer. Proportionally, a 10 cm stem might be a bit short. A 60 cm frame might come with an 11, 12, or 13 cm. stem. If you can straddle the bike with 1" clearance, the bike isn't too big for you. A longer stem would probably be proportionally right.
re: bike fit..._Marty_
Feb 22, 2002 12:53 PM
seat tube is 60cm center to top... no idea what top tube is.. never bothered to measure it out.. stem looks lik 100mm.. not sure either.. feels good when on the bike.. but can see my front axle it front of handlebar/stem clamp..
re: bike fit...guido
Feb 22, 2002 1:18 PM
Do you have long legs proportionally to your upper body? If so, you might be about right. Otherwise, I'd go with at least a cm. longer stem. This Spring, think about how your upper body feels on long rides. How flat can you make your back? A humped back, typically accompanied by lower back pain, is a symptom of not enough reach. I went through two stem extensions before I got it right. My handlebars are only 2" lower than the saddle, a non-racing positioning, but lengthening the reach helped my lower back, spine, and breathing. I went from a 10 cm. to a 12 cm. stem on a 54 cm. bike.
Are you comfortable with you current setupDave Hickey
Feb 22, 2002 1:09 PM
Unless you feel like you are too upright, why change? The handlebar vs front hub is a general fit rule. If you feel like you need a longer stem than try one but if your comfortable with your current setup, leave it the way it is.
Fit is personalKerry Irons
Feb 22, 2002 4:38 PM
So you have to decide whether that stem is too short. If your proportions are typical, and the 60 cm is the right size for you (how much seat post showing?) then it is likely that the 10 cm stem is too short. However, if you have a more upright position, a short torso, or short arms, then it might be OK. The "bars hide the hub" has been a good rule for my, but my body proportions are "textbook average". I'm riding a 59 cm frame (57.5 top tube, 73 seat tube angle) with a 13 cm stem, and could be using a 14 without much stretch. Ask yourself if it feels right, not if it looks right. If you can easily imagine the bars farther forward without feeling stretched, then that is the way to go. Depending if/how cramped you feel, you might consider a 12 or 13 cm stem.
functional test...C-40
Feb 22, 2002 5:04 PM
Having the bars visually obscure the view of the bike's front hub is coincidental and meaningless.

A functional check for sufficient stem length is knee to elbow clearance when riding in the drops, with fingers in reach of the brake hoods. If your knees and elbows overlap, it's a sign that your stem's too short. Better to have a small amount of clearance. Pros might run several centimeters of clearance.

Your saddle posiition will also affect knee to elbow clearance. Have you ever read about knee over pedal posittion (KOP)? If not, it's an interesting topic of considerable debate and misunderstanding. I won't elaborate here. Try for more info.