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Bigger Size and Shorter Stem or Smaller Size or Longer Stem?

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Bigger Size and Shorter Stem or Smaller Size or Longer Stem?

Old 12-15-17, 07:58 AM
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Bigger Size and Shorter Stem or Smaller Size or Longer Stem?

The geometry charts of a bike I want to buy are below (its a french bike).

I normally ride a bike with an ETT of 54cm and 100mm stem which matches the "M" size.

But this is a very upright geometry (stack is quite large) so I was thinking of going with an "L" size and put a 90mm stem or a "M" size and a 120mm stem.

Thoughts?
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Old 12-15-17, 11:52 AM
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Originally Posted by raria
The geometry charts of a bike I want to buy are below (its a french bike).

I normally ride a bike with an ETT of 54cm and 100mm stem which matches the "M" size.

But this is a very upright geometry (stack is quite large) so I was thinking of going with an "L" size and put a 90mm stem or a "M" size and a 120mm stem.

Thoughts?
Two considerations which are completely missing from your post:
1. Saddle setback. What are you used to, and what are you targeting; would either the M or the L size bike allow you to get there?
2. Handlebar height. What are you used to, and what are you targeting; how much of a limitation would either size bike impose? Particularly the high stack of the L size would concern me as my bikes have the h/bars @ 40 - 60 mm below the saddle.

You could play a bit with current/desired/offered geometries here to visualize the differences:
Stack and reach calculator
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Old 12-16-17, 03:11 PM
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what kind of riding do you plan? racing tuck or touring comfort?
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Old 12-16-17, 04:15 PM
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Originally Posted by raria
The geometry charts of a bike I want to buy are below (its a french bike).

I normally ride a bike with an ETT of 54cm and 100mm stem which matches the "M" size.

But this is a very upright geometry (stack is quite large) so I was thinking of going with an "L" size and put a 90mm stem or a "M" size and a 120mm stem.

Thoughts?
It is unclear from your post whether you wish to change your position from your current bike or not.

If you want to sit up more and the ETT is the same, then you wouldn't go up to a 120mm stem. As you sit up your torso pulls back, shortening reach. So you would generally use the same stem length (100mm) or shorter, not longer.

Why would you go to a Large if you already ride a M and the new M has a higher stack? I don't understand why you would want even more stack AND reach by going up a frame size.
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Old 12-24-17, 04:12 PM
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It might look clearer to us if you could measure those dimensions on your usual bike and show them as a comparison. If your current ETT is 540 mm, I’d target the small frame for you. For some of those dimensions the difference between S and M is rather large.
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