Mavic Wheels Rebuild

[icemanvw]

Hi all

 

I need some assistance. I have been to w few cycling shops in the Centurion area and nobody can help. All response I receive is that I have to buy new wheels. Here is what I have.

 

I have Mavic Cosmic rims that have Shimano 8spd Tiagra clusters on it. I also have the Campag rigida rims which has Campag 10spd clusters on it. I want to rebuild the Mavic rims with the 10spd Campag clusters but the shops in Centurion advised me that this cannot be done. Surely there must be a way. Can someone please assist me or send me in the right direction.

[Wannabe]

PM Johan Bornman. He's the man you are looking for.

[RodTi]

PM Johan Bornman. He's the man you are looking for.

 

+1

[Johan Bornman]

PM Johan Bornman. He's the man you are looking for.

I just happened to stumble across the man this afternoon and he had this to say:

 

The Cosmic rim in interesting in that it looks like a fancy rim but it is just a box-section rim with a fairing on. Like a Fifty* with mags.

 

 

The only trick to building with it is to find nipples that can be turned by a hex driver inserted from the outside of the rim, since you cannot access the nipples in the normal way, them being obscured by the fairing.

 

Johan says that provided the two wheels have the same number of spokes, the rebuild will not be a problem for any competent wheelbuilder that's willing to get off his arse and tackle the job.

 

He says he can do the job provided the rim is in a good condition, the OP realises that it will require new spokes and relatively expensive nipples. He also says the OP must tell those bike shops that said....nevermind.

 

 

* Fifty. Apparently this is what they used to call little motorbikes in the old days.

Edited March 27, 2011 by Johan Bornman

[gummibear]

The Cosmic rim in interesting in that it looks like a fancy rim but it is just a box-section rim with a fairing on. Like a Fifty* with mags.

 

What rim do they use?

 

Kids now ride 125 and no more 50cc they now for collectors.

[Wannabe]

 

Kids now ride 125 and no more 50cc they now for collectors.

Then I must be ancient. My first "fifty" was a Honda SS four stroke. Next one was a two stroke (aircooled). Only a good couple of years down the line the watercooled two strokes (Yamaha RZ50) came out. The rest of the the manufacturers then followed suit. If you had your fifty bored out to sixty cc's and you could break 100km/h, you were the man. Ah, the good old days.

Edited March 27, 2011 by Wannabe

[gummibear]

I had a MBX 50

[Johan Bornman]

What rim do they use?

 

Kids now ride 125 and no more 50cc they now for collectors.

 

Here's a Cosmic in cross section. The rim looks a bit like an Open Pro, but it isn't.

 

 

 

Here I've attempted to peel away the fairing to show that the rim is slightly modified. They've created a recess in the side of the alu rim so that the glued-on fairing can lie flush with the side of the rim.

 

 

 

This is a neat way of creating a lightweight deep section rim, in my opinion. Deep sections are notoriously heavy and if they're not heavy, they're very expensive to manufacture a-la Zipp.

 

In the case of a Zipp, the entire rim is structural and the nipples are actually supported by the sharp end of the rim. Quite a remarkable bit of design and manufacturing.

 

In the case of the Cosmic, only the alu part is structural and the fairing is just that, a fairing.

Edited March 27, 2011 by Johan Bornman

[gummibear]

Thanks Johan.

[Ghostface]

Unless I've mis-read something here I think all you need to do is buy a Campaq Freebody for the Cosmic wheel. They should be about R850.00 from any good bike shop.

[icemanvw]

Hi all

 

Thank you for your response, I appreciate it. I have been sent up and down by Cyclelab and Cajees without any help. At least I know now what I need.