I've got an older set of 700 wheels that should be replaced with a set I picked up recently. The problem is that the newer set has a 135mm rear dropout spacing axle and the old set is 126mm, which fits my older road bike frame. The newer set has a 9 speed cassette and the older is a 7 speed cassette.
Can I change the axle in the newer set to fit my older frame and will the older 7 speed cassette work fine or do I need to change the cassette freewheel??... or if there is a better way... ?
The entire hub is generally built for the wider spacing. If the hub does not have a total of 9 mm of spacers that can be removed then it's not possible in the front, and as already noted even if possible it's problematic. Otherwise the usual solution is to spread or "cold set" the frame (Google "cold set bicycle frame")
I actually got a chance to try the newer wheel for fit in my 126mm frame. The axle on the newer wheel is 130mm, not 135mm. It seems to go in and out of the frame with no problem. The wheel is square in the frame, so no dishing is needed.
What size spacer do I need now to get the cassette gears to line up perfectly??
Thanks again !!
Just Google 7 speed cassette on 9 speed hub.
Went to the local bike shop and picked up, what I thought, was the right spacer for this application. Told them what I was doing and with what model cassette, hub, ect., they gave me a spacer, but were not sure which one I needed... said, "They usually fit them for what ever was needed to get the right spacing."
So I bought the one they gave me and went to try it out. It was way to large in circumference and was wobbling around on the hub freewheel. I decided not to install.
Looked at the receipt and they had the spacer listed as a: Headset Spacer 1 1/8 5mm Black
Will this work?
Are they allowing for the rivets on the back of the cassette by having a larger circumference spacer to clear them??
Figured I would go and take another look to see, but wanted to ask you guys first.
That doesn't sound right. The spacer should fit fairly snug around the freehub. Take it back and take the wheel with you to test fit for diameter and thickness.