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Fit Question - Klein Quantum(7 posts)

Fit Question - Klein Quantummbologna
Jul 10, 2002 6:56 PM
Hi! I'm pretty new to riding, but I'm sorta freaking out about whether my bike fits or not. I know there is no perfect science, but I'm just looking to see if I'm in the ballpark. I'm 5'8 1/2" tall, and my inseam is 31 inches. I'm riding a 54cm Klein Quantum. I did get fit at my LBS, though since it's my first bike, I don't know exactly what they are supposed to do.

I've ridden about 500 miles in 10 weeks. The bike feels ok, but I still feel really stretched out. Also, I read a lot on this board about sitting on the 'sit bones' but I feel like I'm riding on my crotch! I also tend to be riding on the nose of the saddle a lot. I've adjusted the saddle up and down, and moved it as far forward as I can (my seatpost has a setback on it, too).

The saddle is just about the same height as the hoods, which seems low compared to other riders setups that I see.

Any guidance or input would be greatly appreciated. I don't know if what I'm feeling/experiencing is just part of getting used to riding, or if maybe the bike isn't the right size.
It sounds pretty closePdxMark
Jul 10, 2002 8:10 PM
The only issue seems to be that the saddle/handlebar distance might be a bit too long for your level of flexibility. (What is too long now might not be so after taking up yoga, but that's for another message thread...). Ignore the high saddles of many other bikes... it's an arrangement that usually suitable for fairly flexible folks.

The seat clamps on many seat posts are set back from the center of the post. Odds are that your seat post is off-set in this way. A seat post with a centered seat clamp should let you get the seat forward enough so you can sit back on the saddle.

The alternative is a shorter stem. I think a shorter stem would more likely keep you in a good position over the pedals than a centered seat post, but if you already have a short stem you might need to try the centered seat post. If things are WAY out of whack, you could always do both.

Nnone of this addresses "Knee-Over-Pedal" (KOP), which some folks think is important and other dismiss as irrelevant.

Good luck.
bad advice...C-40
Jul 11, 2002 5:11 AM
The saddle fore/aft adjustment should only be used to place the knee in the optimum position relative to the bottom bracket. Placing the knee directly over the pedal spindle is a good starting point, but from there, adjustments should be made to find the position that best balances the torque and cadence.

After a resaonable knee position is established, the proper stem length can be selected. Beginners will generally use a shorter stem. As experienced and strength is gained, the stem length is often increaased. As long as the stem provides some knee to elbow clearance when riding in the drops, its long enough. Additional length is entirely optional.
I agree with C-40Spoke Wrench
Jul 11, 2002 5:30 AM
The bottom bracket is the one fixed point regarding bike fit. Everything else has to be adjusted in relation to that.

First step is to position the saddle relative to the bottom bracket. You'll probably need help to get it close. Make sure the saddle is level.

After that's done, you can position the handlebar relative to the saddle. This is a very individual adjustment based upon your flexability and riding style as much as your skeleton dimensions.

It sounds to me like your handlebar is too low or too far away, maybe both. The cure may be as simple as flipping the stem over.
I agree with C-40mbologna
Jul 11, 2002 8:22 AM
Thanks to everyone for the advice!

I'm pretty comfortable with the knee position, and that was one of the reasons I moved the seat forward. The stem is already flipped over, and the bars are pointed upwards pretty agressively, at least compared to the traditional position. It sounds like some of it might just come with more time on the bike.

Any thoughts about the issue of how I seem to be riding on my crotch rather than the sit bones? Does this tie into the other issues? Could it be that I'm having to reach too far, or is it a matter of getting used to the position, or maybe changing out the saddle?

Thanks again!
Everything's related.Spoke Wrench
Jul 11, 2002 10:02 AM
Stretching too far forward causes you to rock forward on your hips. If it was my bike, I think that I'd try a shorter stem.
ok... well I tried & learned... :) nmPdxMark
Jul 11, 2002 10:28 AM