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PostPosted: Tue Nov 09, 2010 9:36 am 
Dirt Disciple

Joined: Sun Oct 31, 2010 4:22 pm
Posts: 16
Location: Hampshire
Have a pair of wheels, unhappy Mavic GP4 rims on Campagnolo Record nice big flanged hubs with stainless spokes.
I've been looking for an oppurtunity to build a pair of wheels and am wondering if the Mavi Open Sport would be a direct swap.
The Open Sport seeming to be a nice budget rim to get started with and going onto a single/5-spd bike.
Thanks


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PostPosted: Tue Nov 09, 2010 10:38 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8220
Location: New Forest, UK
You need to check the internal diameter, I assume that what you intend is to tape the rims together and then transfer the spokes across?

If the ID is the same (or within a couple of mm) you should be OK.


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PostPosted: Tue Nov 09, 2010 11:30 am 
Dirt Disciple

Joined: Sun Oct 31, 2010 4:22 pm
Posts: 16
Location: Hampshire
that's what I was figuring.
I picked the open sport a. because of value and b. it dosen't seem to have evolved (in shape).
Internal diameter, good idea, see if I can find that out.
Anybody got a tape measure handy.


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PostPosted: Tue Nov 09, 2010 11:49 am 
Dirt Disciple
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Joined: Sat Sep 18, 2010 4:16 pm
Posts: 98
Location: In the Ghetto Walthamstow
Check out this thread I did it has almost eveything you will need to know about wheel builds..

http://www.retrobike.co.uk/forum/viewtopic.php?t=122089


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PostPosted: Tue Nov 09, 2010 2:24 pm 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5785
Location: Lost in Translation
Classic sprint rims like the GP4 tend to have a much larger effective diameter than modern clincher rims, even relatively shallow ones like the Open Sport. If they're currently built 3-cross, you might get away with going to 4, but I think you'll need to replace the spokes.


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PostPosted: Tue Nov 09, 2010 3:22 pm 
Dirt Disciple

Joined: Sun Oct 31, 2010 4:22 pm
Posts: 16
Location: Hampshire
one-eyed jim, that's the conclusion I seem to be coming to looking at the online spoke calculator like the one in triniriderz link. An erd of 615mm seems relatively large. Obviously going to have to investigate further.
Or sell the nuovo hubs and look for a complete second hand set.


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PostPosted: Tue Nov 09, 2010 11:28 pm 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5785
Location: Lost in Translation
Large-flange Record hubs are popular in the second-hand market.

If you can track down some older clincher rims you might have a better chance of getting things to work without a change of spokes. The MAVIC MA2 or MA40 and Sun CR18 would probably fit the bill, though you're unlikely to find either except by trawling eBay, and the MAVICs can fetch quite serious money.


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PostPosted: Wed Nov 10, 2010 9:55 am 
Dirt Disciple

Joined: Sun Oct 31, 2010 4:22 pm
Posts: 16
Location: Hampshire
I'm in no rush at the moment so I'll sit back and trawl. Need to finish my Raleigh off first and see if anything else comes along which might sway my decision one way or the other.
Thanks for all the responses though, gained some useful information through them.


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PostPosted: Wed Nov 10, 2010 11:47 pm 
Gold Trader
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Joined: Wed Jun 20, 2007 11:19 pm
Posts: 7006
Location: Odense, Denmark
Tub rims like yours normally need spokes a couple of mm longer than similar clincher rims.

Do the measurements first though.


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PostPosted: Thu Nov 11, 2010 9:45 am 
Retro Guru
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Joined: Thu Jul 26, 2007 11:22 am
Posts: 351
Location: Sideways in Wellington, New Zealand
Keep the hubs take the hit on the new spokes and build the wheel it will last longer anyway!


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