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Bike fitting and used bikes



 
 
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  #31  
Old May 2nd 08, 08:29 PM posted to rec.bicycles.tech
landotter
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Posts: 6,336
Default Bike fitting and used bikes

On May 2, 2:16 pm, wrote:
You must be misshapen to be 6'2 and fit on a 56 bike. At 5'11 I'm
severely cramped on most 54's. Compact frames suck. It is difficlt
and costly to get the bars near saddle height even on large frames. I
only buy traditional frames


I *thought* that was a mounting peg.

woosh
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  #32  
Old May 2nd 08, 09:06 PM posted to rec.bicycles.tech
Ron Ruff
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Posts: 1,304
Default Bike fitting and used bikes

On May 2, 1:16*pm, wrote:
You must be misshapen to be 6'2 and fit on a 56 bike. *At 5'11 I'm
severely cramped on most 54's. *Compact frames suck. *It is difficlt
and costly to get the bars near saddle height even on large frames. *I
only buy traditional frames


I don't understand what the "problem" is with sizing compact frames.
It could only be an issue if you are accustomed to sizing via crotch
clearance or seat-tube length, and are unwilling to think about it for
two minutes. Size by headtube length... problem solved.

And as I showed earlier, there is no sane reason to have sizes in 1cm
increments. The reach measurement goes up slowly and generally the
headtube length increases pretty dramatically... but they always do so
in concert. What if you want the reach of a 54 and the height of a 60?
Or vise versa? You are screwed because only a custom frame would have
these proportions. If I spec'd my own brand of road bike or frame, I'd
have 3 reach measurements and 2 height measurements... ie S,M or L
with regular and tall options for headtube length. The would span the
typical range of ~52-62cm on normal frames. The reach would increase
~2cm between each size, and the height ~3cm, and with the "tall"
option the headtubes would all be 3cm longer. It would be a more
functional and universal sizing scheme than what is currently offered.
 




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