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Old 06-16-09, 05:10 AM   #1
mommus
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Maximum frame width

hi everyone,

was just reading the post by pannierpacker on widening the Q factor with adaptors.

I've been thinking a lot about the width of bike frames.

I've got my folding bike design down to 135mm across where your knees would be. Is this too wide? I was cycling my mountain bike the other day (without toe clips) and reckoned my knees were about 250mm apart. However when I see race bikes going past, the riders seem to keep their knees very close indeed.

Am I just a bow-legged yokel or are most people happy cycling with a bit of 'gait'.

I'm only asking as the design I'm working on pretty much necessitates a wide twin-spar frame.
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Old 06-16-09, 09:24 AM   #2
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Go for an early morning walk on the beach or in new snow. Imagine a line connecting all of your left footprints and one connecting all of your right footprints. How far apart are those two lines? I'm thinking that would be the ideal spacing for your pedals but I don't think it's possible to get them that close.
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Old 06-16-09, 10:16 AM   #3
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hmmm... I have neither a beach nor new snow in London (boo). But I guess you're right about the optimum spacing.

What I really meant to say was, could you live with a frame 140mm wide if it meant you could have a full size folding bike that would pack up smaller than a Brompton?
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Old 06-16-09, 10:34 AM   #4
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only way to find out is to make a prototype and have a few test riders ride it.

I for one wouldn't really like 140mm wide where my knees will be, but if it's at the BB area or cranks, I don't think it would be that bad.

check out surly pugsly for instance.
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Old 06-16-09, 12:29 PM   #5
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I'd want to see and ride a prototype too.

People ride horses and they're a lot wider than 140 mm. I'm not sure what that extra width might do to the angle of the rider's knees.
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