Cassette change 9 to 10 speed

StillGoing

I have a spare rim with a Shimano 9 speed cassette on it that I want to use as a turbo wheel for my main bike which is 10 speed. I've tried fitting the 10 speed Shimano cassette but when I fit it to my main bike the rear derailleur touches the spokes. I've read about fitting a spacer but that then prevents me fitting all 10 cogs of the cassette securely (the 11 tooth just spins as it can't fit on the splines of the hub.) My LBS has suggested fettling with the derailleur each time I change wheel but I can't see that that is either practical or the answer to the problem. A wheel change should be a simple thing in my book. I assume there's plenty on here who may have gone from a 9 speed to a 10 speed cassette on a rim and just wondered if it is the hub itself that needs changing too or is there a trick I'm missing somewhere?

smidsy

Depends how the other wheel hub sits in relation to your current set up. Sounds like it is spaced differently so changing the relationship between your cassette and rear mech.

Also when fitting the 10 speed to a freehub that currently has 9 speed you would generally need the spacer to make the stack height fit securely.

sungod

if the hub is shimano 9 speed compatible, then...

sram 10 speed cassette, use without a spacer

shimano 10 speed cassette must use the 1mm spacer (unless it's a tiagra 4600 cassette, which doesn't use one)

if the rd is touching the spokes when you simply fit the wheel, seems odd, is the cassette on your normal 10-speed wheel correctly fitted with any necessary spacer?

StillGoing

The Mavic cosmic I have my SRAM 10 speed cassette fitted on works perfectly, the spare rim I have is a Shimano rim that originally had an old 9 speed Shimano 105 cassette fitted. I picked up a 10 speed Shimano Tiagra cassette and tried it without the spacer, which is when the SRAM RD interfered with the spokes when put on the bike. I then tried fitting the 10 speed Shimano Tiagra with a 1mm spacer but then had the problem of the 11 tooth cog not securing on the hub splines? I'm baffled as to the problem but slowly resolving myself to maybe having to convince the wife I need some more wheels instead.

nicklouse

So. You have a Tiagra 4600 cassette. You do not need a spacer. But you will need to reset your rear mech to suite this "new" set up.

Have fun.

StillGoing

That doesn't make much sense; how can the rear dérailleur be perfect when using a 10 speed SRAM cassette but not with a 10 speed Tiagra cassette when Shimano and SRAM are interchangeable? Surely both cassettes are the same size and would logically fit the same hub, yet for some reason I have to adjust the rear dérailleur each time I change wheels.

Your's very confused but thanks all for the responses.

nicklouse

As the hubs are different.

The Mavic hub requires a spacer to use any other cassette than a Mavic one. So inf you used a shimano cassette other than the one you have you would need two spacers.

As the geometry of the Mavic hub is special you will need to reset the mech stops.

In fact you do with most hub swaps as they wear at different rates they are all different.

Finally as the part that holds the cassette (body) on the Mavic hub is longer it means the the flang is further away from the drop out so yes I would expect the mech to contact the shimano hubbed wheel (or any other hubbed wheel) ad that is the way it would be.

Re fit the wheel and set the mech stops and it will be fine.

If you don't want to do this get a new wheel with the same hub and fit the shimano cassette with the Mavic spacer and it should be close to the same as before. But you may still need to tweak the mech a bit.

Have fun.

StillGoing

Excellent thanks for clarifying that for me. New rims needed then.

nicklouse

philthy3 wrote:

Excellent thanks for clarifying that for me. New rims needed then.

Rims?

Just set your mech.