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ACK!!! I've been doing it all wrong!

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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

ACK!!! I've been doing it all wrong!

Old 08-29-12, 05:51 PM
  #1  
Lewis_Moon
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ACK!!! I've been doing it all wrong!

Well, it's indoor season here in AZ, you know, not enough time between sunrise and rush hour to get a reasonable workout in, and still blazing hot in the PM. So, I broke down and bought a trainer and decided use the opportunity to take a look at my bike position. Crap. Crap, crap, crap. In my most comfortable position, I dropped a plumb from right under my knee cap and, lo and behold, my knee is ~4+ cm in front of the spindle at the 90 degree position. I like a forward saddle position, but I didn't know it was that much. I looked to ease the saddle back a bit...and there's no more rail. I'm a big boy: 6'4" tall.

I need some crowd sourcing on this...I think I've always ridden in (sorta) this position, but may have made it worse with the new frame after a 20 year layoff. I'm also worried that this might not be the "best" position. If I try to move the seat back I'll need a setback post and a new stem. How hard should I pursue this?
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Old 08-29-12, 05:56 PM
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I wouldn't worry about it if you're not having any problems. The plumb bob technique is just a decent place to start.

If you really want to change it, you'll need a seat post with more set back
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Old 08-29-12, 07:08 PM
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Did you put a block under the front wheel? The bike needs to be level when you do the plumb bob thing.

something I do to make this an easier check. I run the plumb bob up from the pedal spindle inside the crank arm, then I mark a piece of tape I place on the top tube. It a lot easier to check when you are doing this by yourself. Once you are close you can recheck with the bob to get a real accurate reading.

Last edited by ls01; 08-29-12 at 07:13 PM.
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Old 08-29-12, 07:08 PM
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Did you have the front wheel raised to match the trainer height?
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Old 08-29-12, 07:16 PM
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Lights are cheaper and much more fun to ride with than on a trainer. Too late, I know, but "just sayin'".
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Old 08-29-12, 07:21 PM
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How large is your crank? That's another fine way to fix your KOPS situation...
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Old 08-29-12, 07:23 PM
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That's what I was thinking...a 210mm crank will solve this problem!
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Old 08-29-12, 07:24 PM
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Originally Posted by RollCNY View Post
Did you have the front wheel raised to match the trainer height?
Yes.
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Old 08-29-12, 07:25 PM
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Originally Posted by TrojanHorse View Post
How large is your crank? That's another fine way to fix your KOPS situation...
They're 175s. I've ridden 180s...
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Old 08-29-12, 07:26 PM
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Originally Posted by datlas View Post
That's what I was thinking...a 210mm crank will solve this problem!

Indeed.
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Old 08-29-12, 07:28 PM
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As mentioned, the knee over pedal spindle method is just a place to start and not necessarily the right answer for everyone. If you have long femurs, you might like a position which allows you to sit further back (like I do).

Why not buy a cheap setback seatpost and play around a bit to see if you like a further back seating position? Just make sure you carefully record your previous position in case the experiment doesn't work out.
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Old 08-29-12, 07:34 PM
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Originally Posted by fa63 View Post
As mentioned, the knee over pedal spindle method is just a place to start and not necessarily the right answer for everyone. If you have long femurs, you might like a position which allows you to sit further back (like I do).

Why not buy a cheap setback seatpost and play around a bit to see if you like a further back seating position? Just make sure you carefully record your previous position in case the experiment doesn't work out.
...and a stem..
This is what I was thinking...anyone point a brotha to cheap 27.4 with at least 2cm more setback than my Thomson with zero?

PS: I'd at least like to explore a more "usual" position on the bike. Always a searcher in the Halls of Power.

Last edited by Lewis_Moon; 08-29-12 at 07:52 PM.
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Old 08-29-12, 07:37 PM
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Originally Posted by MegaTom View Post
Lights are cheaper and much more fun to ride with than on a trainer. Too late, I know, but "just sayin'".
agreed...I just have to ride on an actual 65mph hiway to get anywhere. I live in the sticks.
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Old 08-29-12, 07:44 PM
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Yikes !
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Old 08-29-12, 07:50 PM
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Originally Posted by MegaTom View Post
Yikes !
..but the drafts are superb.
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