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The KOPS have it in for me!

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The KOPS have it in for me!

Old 10-31-05, 06:11 PM
  #1  
crash66
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The KOPS have it in for me!

Ok, with my bike firmly on the trainer, I've been trying to dial in my riding position.

The facts: I'm 5'7", 31.5" cycling inseam, size 9.5 US shoe size, bike size 52 on a compact frame.

My problem is it seems absolutely impossible for me to NOT violate KOPS. My front knee is around 1.25-1.5" past the crank arm (meaning it's wayyy past the pedal spindle.)

Zinn says the end of the crank arm is the relevant landmark, so that's somewhat comforting, but not enough so. I've also read that KOPS is an unreachable myth given the steep seat tube angles of modern frames (especially on my size 52). These seat tube angles mean you are that much farther forward, and no amount of saddle movement backward can compensate (and will only end up making your arse uncomfortable too.)

Is there hope? I don't feel entirely uncomfortable riding in this position, but I'm sure I could be more comfortable and efficient if I could somehow make the necessary adjustments. But how??

Should I have bought a larger frame? Dave Moulton's site suggested that I might have big feet for my size (though my wife would argue I don't....) and that I should possibly be on a 53-54 frame. I can't imagine that would push me back far enough, and would probably introduce other fit issues.

Any thoughts? Is there anything else I can tweak?
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Old 10-31-05, 06:58 PM
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How fast do you ride? A forward seat is not necessarily bad if you are hammering all the time. To far forward can, however, lead to back problems if you are a slower rider. That is one reason why slower riders generally prefer more relaxed frame geometries.

How much setback does your seatpost have? Most road frames are designed to be used with setback seatposts. Some posts have an inch or more of setback.

Last edited by johnny99; 10-31-05 at 07:58 PM.
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Old 11-01-05, 05:33 AM
  #3  
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I would reccomend buying a seatpost with a larger rear offset and giving it a go. It's way cheaper than buying a new bike just to play arround with fit. Truvativ makes a reasonably priced seatpost with 40mm rear offset rather than the usual 25mm. Oval make this post, https://www.ovalconcepts.com/products...i=48&idProd1=2 with up to 50mm of offset.

My experience suggests that it's deffinitely worth giving it a try.

Regards, Anthony
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Old 11-01-05, 05:41 AM
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Any thoughts? Is there anything else I can tweak?
new seatpost.
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Old 11-01-05, 05:00 PM
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Dude, you're all LEG!!! You're only 2" taller than me but you've got an inseam that's 4" longer! It would appear from that inseam-length that you'd want to be riding a 54-56cm bike?

Yah, more rear-set seatpost will work. However, it will cause your bike to have more rearward weight-distribution than a more optimized frame with more laid-back seattube angle (and longer rear-triangle).
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Old 11-01-05, 06:02 PM
  #6  
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Originally Posted by crash66
Ok, with my bike firmly on the trainer, I've been trying to dial in my riding position.

The facts: I'm 5'7", 31.5" cycling inseam, size 9.5 US shoe size, bike size 52 on a compact frame.

My problem is it seems absolutely impossible for me to NOT violate KOPS. My front knee is around 1.25-1.5" past the crank arm (meaning it's wayyy past the pedal spindle.)

Zinn says the end of the crank arm is the relevant landmark, so that's somewhat comforting, but not enough so. I've also read that KOPS is an unreachable myth given the steep seat tube angles of modern frames (especially on my size 52). These seat tube angles mean you are that much farther forward, and no amount of saddle movement backward can compensate (and will only end up making your arse uncomfortable too.)

Is there hope? I don't feel entirely uncomfortable riding in this position, but I'm sure I could be more comfortable and efficient if I could somehow make the necessary adjustments. But how??

Should I have bought a larger frame? Dave Moulton's site suggested that I might have big feet for my size (though my wife would argue I don't....) and that I should possibly be on a 53-54 frame. I can't imagine that would push me back far enough, and would probably introduce other fit issues.

Any thoughts? Is there anything else I can tweak?
Try dialing in on the real road, not a trainer. A trainer will often promote a less than natural riding position, partly because of the lack of gyroscopic balance. As for the size of your bike, saying you have a "52 compact" is practically meaningless. What are the other specs? If you can get to within 2 cm of KOPS with a normal setback seatpost, you should be good to go. I suspect that you may be sitting in a too forward postion on your saddle.
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Old 11-01-05, 07:01 PM
  #7  
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Originally Posted by DannoXYZ
Dude, you're all LEG!!! You're only 2" taller than me but you've got an inseam that's 4" longer! It would appear from that inseam-length that you'd want to be riding a 54-56cm bike?

Yah, more rear-set seatpost will work. However, it will cause your bike to have more rearward weight-distribution than a more optimized frame with more laid-back seattube angle (and longer rear-triangle).

Danno-

I too am 5'7'', and ride a Roubaux Elite 52cm. My inseam is 32.5, and my seat is almost all the way back. Right now im about .5cm behind the pedal spindle.

I think if I went with a 54cm frame, I would be too stretched out over the top tube. I actually had to go from the stock 100mm stem to a 90, due to my set-back. It seems that us short, all leg guys/girls would need a bike with a shorter top tube.

~Rich
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