London Fixed-gear and Single-speed SJS Cycles

mechanical_vandal · 17th November 2008

Despite the fact that it'll b total marmite when finished iv been toying with the idea of putting a disc on my Genesis. Not gonna go into the reasons or get into any arguments about how wrong it'd be to do this i just want peoples opinions on whether a cxp30 will be up to the stresses produced by a disc brake? I know the cxp30s are meant to be pretty tough so i'm thinking it'll be all gravy? Btw its on the front im talking about.

DFP · 17th November 2008

Ive seen hub brakes on bikes with basic plain single wall aluminium rims before. Which seem to last forever. CXP30 are good rims, should be more then tough enough. Can a disc brake cause much more strain than skid stopping?

MrSmyth · 17th November 2008

the rim is irrelevant.
it's all about the hub, spokes and the disk mount on the fork.

scott not scot · 17th November 2008

As usual mr smith is right.
The only difference regarding the rim is that you can use ones with no braking surface for a much smoother shape.

RPM · 17th November 2008

Quote:

Originally Posted by deadly fanny pack

Can a disc brake cause much more strain than skid stopping?

no tyre is grippy enough, and no rider heavy enough, for the forces acting on a rim through braking to be an issue.

it's all about the fork, hub and mounts.

if you bodge a disc mount to a fork not meant for it, you may experience some turbulence followed by a taste of tarmacadam.

TheBrick(Tommy) · 17th November 2008

Quote:

Originally Posted by scott not scot

As usual mr smith is right.
The only difference regarding the rim is that you can use ones with no braking surface for a much smoother shape.

As usual Scott is right. The only difference regarding the rim is that you can use ones with no braking surface for a much smoother shape.

mechanical_vandal · 17th November 2008

Yeah i suppose the forces would be really quite similar to a fixed rear wheel.
I will be changing the forks not bodging.
I want to use the cxp just now but may respray it when i unlace it and may change for a non machined rim in the future.

Momentum · 18th November 2008

I've got a disc wheel built up on a cxp33 which is fine - have taken it out on single track as well as riding in london's famous london and it hasn't been a problem. My 29er has beefy touring rims with a 200mm disc on the front and they're fine, so a cxp30 on the roads will be absolutely no problem.

johnnyhotdog · 20th November 2008

Quote:

Originally Posted by mechanical_vandal

Despite the fact that it'll b total marmite when finished iv been toying with the idea of putting a disc on my Genesis. Not gonna go into the reasons or get into any arguments about how wrong it'd be to do this i just want peoples opinions on whether a cxp30 will be up to the stresses produced by a disc brake? I know the cxp30s are meant to be pretty tough so i'm thinking it'll be all gravy? Btw its on the front im talking about.

don't worry - you're secret is safe with me. will this be up and running by december? i'd like to see how it works out.

are you still running freewheel with an invisible rear brake? i thought that combo was far more radical than what you're planning - are you adding a rear brake or going fixed?

17th November 2008	#1
mechanical_vandal	Disc brake on a cxp30? Gonna kill it? Despite the fact that it'll b total marmite when finished iv been toying with the idea of putting a disc on my Genesis. Not gonna go into the reasons or get into any arguments about how wrong it'd be to do this i just want peoples opinions on whether a cxp30 will be up to the stresses produced by a disc brake? I know the cxp30s are meant to be pretty tough so i'm thinking it'll be all gravy? Btw its on the front im talking about.
	quote reply

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17th November 2008	#3
MrSmyth	the rim is irrelevant. it's all about the hub, spokes and the disk mount on the fork.
	quote reply

17th November 2008	#4
scott not scot	As usual mr smith is right. The only difference regarding the rim is that you can use ones with no braking surface for a much smoother shape.
	quote reply

18th November 2008	#8
Momentum	I've got a disc wheel built up on a cxp33 which is fine - have taken it out on single track as well as riding in london's famous london and it hasn't been a problem. My 29er has beefy touring rims with a 200mm disc on the front and they're fine, so a cxp30 on the roads will be absolutely no problem.
	quote reply

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