Changing Wheels and Spacers

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Hi,

After much soul searching I decided to buy a new road bike and update my ageing mountain bike, not being flush enough to buy both new. As my rims are wearing out I need to replace the wheels (my first time). Being an older bike, I have a 7 speed XT cassette, and the wheels I am looking at take an 8/9 speed cassette, so I believe I will need to use a spacer. In realtion to this I would be much appreciated for some expert input on the following uncertanties:

1. Does the spacer go onto the hub before the 7 speed cassette?
2. Will I need to any other adjustments to the derailleur set up e.g. to stop the chain from slipping off the first gear?
3. Will performance be impacted at all by using a spacer?

Cheers,

Rusky

1) Yes, a 4.5mm spacer should be installed onto the hub before the cassette.
2) Possibly, but you should be OK if using the same cassette.
3) No.

Check out this link for more info:
http://sheldonbrown.com/k7.html

Much obliged!



1) Yes, a 4.5mm spacer should be installed onto the hub before the cassette.
2) Possibly, but you should be OK if using the same cassette.
3) No.

Check out this link for more info:
http://sheldonbrown.com/k7.html

Check that the drop out (over lock nut) distance is the same for both wheels, 135mm.

You could use an 8 speed cassette and no spacer, the 7 speed shifters will work the high 7 speeds of the 8 ok. I do this on the GF's 7 speed bike when I use 650c wheels. ;)

Interesting alternative idea. Thanks also.



Check that the drop out (over lock nut) distance is the same for both wheels, 135mm.

You could use an 8 speed cassette and no spacer, the 7 speed shifters will work the high 7 speeds of the 8 ok. I do this on the GF's 7 speed bike when I use 650c wheels. ;)