P-clamps issue
09-10-21, 01:24 PM
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P-clamps issue
I want to attach a rack to a bicycle but the bike frame does not have eyelets. I plan to use p-clamps but the the frame at the clamping point is not completely round. It flattens out about where the wheel begins. Can a p-clamp tighten on a more rectangular surface?
09-10-21, 01:38 PM
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Probably, yes, but it might move around a bit and require tightening after a few rides and it has found its natural resting place. However, P clamps are not great for holding a load - they will probably eventually break if you are using them as structural supports at dropouts. This is not a problem with using p clamps on the seat stays for the upper supports because these don't hold any weight. But at the dropouts they're best for only light loads.
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09-10-21, 09:10 PM
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What kind of bike are you clamping on? Carbon is a no go and if the frame isn't designed for a rack probably that is the manufacturer saying maybe not a rack. Remember if you do end up using p-clamps you will likely void the warranty, and won't be able to hold as much weight.
09-10-21, 11:04 PM
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For road bikes, look at something like this:
https://www.axiomgear.com/products/r...iner-road-dlx/
It attaches via the rear QR skewer and the seatstay bridge eyelet.
https://www.axiomgear.com/products/r...iner-road-dlx/
It attaches via the rear QR skewer and the seatstay bridge eyelet.
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09-11-21, 09:26 AM
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For road bikes, look at something like this:
https://www.axiomgear.com/products/r...iner-road-dlx/
It attaches via the rear QR skewer and the seatstay bridge eyelet.
https://www.axiomgear.com/products/r...iner-road-dlx/
It attaches via the rear QR skewer and the seatstay bridge eyelet.
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09-13-21, 11:30 AM
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one might use some padding around the frame part so that the p-clamp will be snug
this is a home made clamp, on the right
I use p-clamps to hold the rack on my road bike, but it's not ideal. they are strong enough but there are more elegant ways to do it
this is one of mine. it is not quite tight enough but there is minimal movement due to it's location, but the frame does show some wear
this is a home made clamp, on the right
I use p-clamps to hold the rack on my road bike, but it's not ideal. they are strong enough but there are more elegant ways to do it
this is one of mine. it is not quite tight enough but there is minimal movement due to it's location, but the frame does show some wear
Last edited by rumrunn6; 09-14-21 at 01:09 PM.
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09-13-21, 04:32 PM
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Use them at work.
Yes they’re strong enough.
But all the work applications clamp around much thicker wall thickness than a bike frame. FWIW.
Also, if clamping around something not actually round, might have to experiment with the next size down than you might think and re-bending and re-tightening after awhile.
Yes they’re strong enough.
But all the work applications clamp around much thicker wall thickness than a bike frame. FWIW.
Also, if clamping around something not actually round, might have to experiment with the next size down than you might think and re-bending and re-tightening after awhile.
