Wheel & Cassette Width

[steve23]

ok, i bought some new wheels (campag shamal) that i intend to use on my road and time trial bike, and use my old wheels (mavic aksium) to train on.

but, i think that they are different widths on the rear wheel. both have the same cassette on, but when i put my shamals on my road bike, i had to move the brakes, and re-adjust the gears. when i then put the aksiums in, now they are not changing gear correctly.

i hope this is making sense!

so, my question is, if i buy a pair of cheap campag wheels to train on, will they have the same spacing and width as my shamals, so i can then swap the wheels as and when trouble free???

thanks

 

[mickle]

The main issue is whether your wheels share the same OLND (over lock nut dimension, which should correspond to the distance between the inside surfaces of your rear drop-outs). Assuming this is the case your brakes shouldn't need adjusting as each rim should sit bang in the middle, if not one of your wheels is dished incorrectly.

Shifting is a different matter. Although cassette spacing itself is standardised there is no standard for how far the cassette sits from the drop-out. They're all within a few fractions of a mm of each other but even a few fractions of a mm difference between the two wheels will put your gears out.

 

[fossyant]

As the man above says - wheels should sit in the middle, but you will have to adjust the rear mech trim slightly as they are not all the same !

 

[steve23]

thanks for the advice.....

but i just tried my mates vento rear wheel and it worked fine!!!

the other wheels that i have are "planet x model b" maybe they just wont work.....???