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  1. #1
    Senior Member stevegor's Avatar
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    26" to 700c conversion?

    I have a hybrid type tandem that I've converted to a 26' wheel roadie which I'm thinking about changing to use 700c wheels. I've got a Velocity 36 hole rim with a 9 spd Ultegra rear hub that fits ok, I just need a set of Ultegra long reach calipers then it should all work. The front is a 36 hole Velocity rim with a Ultegra hub also, and I can swap out the 26" fork for a suitable 700c one. I have a set of Shimano 105 triple shifters, 9 spd long cage RD and a 9 spd Ultegra triple crank set, so my questions are these.

    1: Would the Ultegra hubs be strong enough?

    2: Would the long reach calipers have too much reduced braking capacity?
    (If I use a 700c fork, a normal reach caliper can be used, if I use the standard one then long reach is the one I have to use).

    3: The spokes are strong stainless steel, but is 36 hole enough in 700c rims?
    (My riding is mainly taking a VI guy on 2 hr rides, but we're hoping to do longer Audax rides in the future, so we're not touring or racing.)

    I have too many other bikes to start spending big $$$ on a good tandem right now, that will come later I hope, but for now is this project feasible or just plain silly?
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  2. #2
    MB1
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    1: Would the Ultegra hubs be strong enough? Probably.

    2: Would the long reach calipers have too much reduced braking capacity? Should work fine except for long downhills where you may find you are overheating your rims.
    (If I use a 700c fork, a normal reach caliper can be used, if I use the standard one then long reach is the one I have to use). I would be worried about changing the steering of your tandem by switching fork and front wheel sizes.

    3: The spokes are strong stainless steel, but is 36 hole enough in 700c rims? Depends on how much the team weighs, the tire width, the road surfaces and the quality of the wheel build.

    If it were my bike I would just go for the best quality 26" wheels and tires and forget the 700c conversion.

  3. #3
    Senior Member stevegor's Avatar
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    Thanks MB1,

    I have fairly good 26" rims now, so I might stay with it as you say.
    Being an ex racing roadie I like speed so I've changed the big ring from a 48 to 52 and will shortly move up to a 54, which should bring it closer to a 52 on a 700c wheel.
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  4. #4
    Senior Member Retro Grouch's Avatar
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    1. What's your rear dropout spaceing?

    2. After you do all that, and assuming you get it to work, what will you have accomplished?

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