wheels carbon or alu

[sebunya]

Is a carbon-rimmed clincher better than an aluminum clincher? <?: prefix = o ns = "urn:schemas-microsoft-com:office:office" />

[ORCA]

 go all carbon or all alu

and if you go all carbon, go tubbie

there is no ?/? here

[The Saint]

Disagree, if you go Carbon go carbon with an Alu braking surface.

 

 

[TNT1]

Can I go alu with a carbon breaking surface

[ORCA]

Disagree' date=' if you go Carbon go carbon with an Alu braking surface.

 

 

[/quote']

 

 

Why?

 

Isn?t the id?e behind carbon to go as light as possible?

just asking

[sebunya]

heard that extreme braking can generate a surprising amount of heat, which warms the tire on the carbon rims. so if this is the case the rim gets hot & tire pressure and can climb high enough to cause a tube blow-out. may this be true?

[ORCA]

heard that extreme braking can generate a surprising amount of heat' date=' which warms the tire on the carbon rims. so if this is the case the rim gets hot & tire pressure and can climb high enough to cause a tube blow-out. may this be true?

[/quote']

 

 

Only if you going down Alpine passes in 40deg heat

[willy]

I noticed that Mavic were talking up their R-Sys wheels saying it gave Ricco and co and advantage. Little did they know 

[jabbathemutt007]

 

I noticed that Mavic were talking up their R-Sys wheels saying it gave Ricco and co and advantage. Little did they know 

 

Hollow spokes are convenient for hiding stuff.

 

[Speed Devil]

I noticed that Mavic were talking up their R-Sys wheels saying it gave Ricco and co and advantage. Little did they know 

Hollow spokes are convenient for hiding stuff.

 

Yeah, get a puncture every few km's. loosen a spoke and take a quick snort

[The Saint]

Disagree' date=' if you go Carbon go carbon with an Alu braking surface.

 

 

[/quote']

 

 

Why?

 

Isn?t the id?e behind carbon to go as light as possible?

just asking

 

Sebunya kinda summed it up. Carbon does not disperse heat very well and in fact retains heat. You don't have to be going down an Alpine slope to generate a lot of heat in a carbon rim but just going down a gentle hill breaking in the bunch will cause sufficient heat build up in the rim - probably not to the extent to blow the tube but the risk is there.

 

The alu breaking surface on a carbon rim helps to a degree to disperse the heat but these have also been known to overheat and from personal experience I can vouch for that.

[sebunya]

 Sebunya kinda summed it up. Carbon does not disperse heat very well and in fact retains heat. You don't have to be going down an Alpine slope to generate a lot of heat in a carbon rim but just going down a gentle hill breaking in the bunch will cause sufficient heat build up in the rim - probably not to the extent to blow the tube but the risk is there.

 

The alu breaking surface on a carbon rim helps to a degree to disperse the heat but these have also been known to overheat and from personal experience I can vouch for that.

thnx MuXmAn so heat may be a problem & considering weigh difference is not  a problem + better price will than go Carbon with Alu surface brake

[ShortLegs]

Check out the Corima all carbon clinchers if tubbies are not an option.

 

Paired with decent brake pads (Corima/Swisstop) the braking is fine.

 

Where Swift? He should pay me commission....

[Johan Bornman]

The mechanisms by which carbon rims fail in prolonged braking has been discussed here often and in much depth. Search for a thread with carbon and Suikerbosrand in the same post and you'll get to it.

 

The summary of it all is that carbon fares poorly when prolonged braking is required. The flipside of that is that the only place in Gauteng where you can possibly do that is in the Suikerbosrand nature reserve.  However, extended wheel draggin on a tandem with carbon rims will produce the same scary result on lesser hills.

 

Going for carbon-specific pads doesn't solve the fundemental problem.

 

Here's the link. MuxMan described the phenomena elegantly in this post.

 

https://www.bikehub.co.za/forum_posts.asp?TID=16937&KW=suikerbosrand+carbon

Johan Bornman2008-07-19 09:55:48

[grosjoster]

you must be or too heavy or going down a looong hill with lots of sharp turns too burst a tyre because of heat from braking. if you are under 80kg then go for full carbon, you won't be dissapointed. or go for the easton ea70 wheels. propably the lightest carbon wheels with an alu braking surface.

[The Saint]

I'm 60Kg's explain that????? And other than dispersing heat with an Alu breaking surface exacly what difference is a full carbon rim going to make??