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Thread: Tandem Issue

  1. #1
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    Tandem Issue

    Hi, I have a few problems that need addressing any help would be great.

    I'm currently stuck in the La Hume in southern France. We have a Longstaff tandem tricycle which has 700c Mavic 3D rims that were discontinued in 1990. They are the older type with the flat inside surface (which the spokes go through) not the slight v shape that are common now. We recently had new DT swiss 2.34 by 296 spokes put on which are brilliant but there was a bit of corrosion around the rim which lead to the eyelets coming out and a pretty buggered rim.

    The trike has two specialist drum brakes and hubs so I can't change them and the spokes fit the flatter rim and won't fit anything in the local bike shops.

    Are there any manufacturers who make the older style rims anymore? Is it better just to right off the 80 euro spent on the spokes and get new rims in the newer style?

    Any other help would be fine.

    cheers

  2. #2
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    Get the spokes cut down for modern rims.

  3. #3
    Nigel nfmisso's Avatar
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    Use SPOCALC or similar program; you will need to know the measurements of your hubs, number of spokes, and ERD of candidate rims. If you are running 40 or 48 spokes, you can also look at X3 vs X4 lacing.

    Spocalc, by Damon Rinard. A free Excel spoke length calculator.

    I use the express version.

    I do not know of anyone who will cut and re-thread spokes. And to do that, you will have to cut off the threads entirely; plus about 1mm past. But if you can find someone to do it, it is possible. You'd end up with something like 284mm spokes max, and possibly a bit shorter.
    Nigel
    Mechanical Design Engineer

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