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Confused by 10 speed cassettes and spacers.

 
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JaRok2300




Joined: 01 May 2014
Posts: 210
Location: Worcester, UK

PostPosted: Sat Aug 19, 2017 5:06 pm    Post subject: Confused by 10 speed cassettes and spacers. Reply with quote

Whenever I swap wheels between bikes I find the indexing is out and I have to adjust the gears and/or the high/low stops to get them working.

Having read up on 10 speed cassettes and spacers it seems a bit of a minefield with variations according to the type of wheel and cassette (E.g. no spacer on Tiagra cassettes)

I have 3 back wheels currently in use so measured the distance from the smallest sprocket to the face of the axle that butts up against the frame/hanger. This seems to be the obvious datum that decides gear adjustment.

On 2 wheels this was 5mm and the other was 4mm. I'm proposing to put a 1mm spacer behind the 5mm ones to make them all 4mm.

Am I missing some other detail and/or does anyone else still run Shimano 10 speed and can tell me what that dimension is on their wheels?

Thanks
Jase
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Cat5 in the Hat




Joined: 14 Mar 2011
Posts: 1070
Location: Berks

PostPosted: Sun Aug 20, 2017 8:03 pm    Post subject: Re: Confused by 10 speed cassettes and spacers. Reply with quote

JaRok2300 wrote:
Whenever I swap wheels between bikes I find the indexing is out and I have to adjust the gears and/or the high/low stops to get them working.

Having read up on 10 speed cassettes and spacers it seems a bit of a minefield with variations according to the type of wheel and cassette (E.g. no spacer on Tiagra cassettes)

I have 3 back wheels currently in use so measured the distance from the smallest sprocket to the face of the axle that butts up against the frame/hanger. This seems to be the obvious datum that decides gear adjustment.

On 2 wheels this was 5mm and the other was 4mm. I'm proposing to put a 1mm spacer behind the 5mm ones to make them all 4mm.

Am I missing some other detail and/or does anyone else still run Shimano 10 speed and can tell me what that dimension is on their wheels?

Thanks
Jase


IME SRAM and Shimano Tiagra don't need spacers. Other Shimano 10spd do. The positions of the cassettes on the freehub should not change as the spacer is effectively build in.

The risk of putting a 1mm spacer behind your 5mm offset combination is that the outboard of the cassette will then be 1mm further from the end of the freehub and the lockring may not get enough purchase to remain on. The exception to the rule is something like a Mavic freehub where an extra spacer is needed as Mavic freehubs were slightly longer.
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Jorgan




Joined: 12 Nov 2007
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PostPosted: Mon Aug 21, 2017 9:01 am    Post subject: Reply with quote

I always find I need to tweak the indexing slightly when changing between my training & race wheel (cassette is always permanently fitted to both). Plus my TT and road bike also have different mechs (SRAM/Shimano) so there's inevitably a tiny difference there too when I move wheels about.

All of the above mechanical shifting obviously.
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stenard




Joined: 04 Sep 2013
Posts: 1311

PostPosted: Mon Aug 21, 2017 10:07 am    Post subject: Reply with quote

Agreed. Whilst the cogs will be the same distance apart on all 10sp cassettes, that's not to say the freehub location is precisely the same laterally on all wheels.

Between my deep rear and my disc, through trial and error, I now know I need 11 clicks on the barrel adjuster to get the indexing back in alignment on my TT. I haven't found the need to bother adjusting high/low limit screws.
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kevb




Joined: 11 Aug 2010
Posts: 768

PostPosted: Tue Aug 29, 2017 1:41 pm    Post subject: Reply with quote

If you have an 11-speed freehub and want to fit a 10-speed cassette, you need to fit the 1.85mm spacer that (possibly) came with the wheel plus a 1mm spacer that came with the cassette. 9/8 speed cassettes don't need the 1mm spacer.

Different hubs will have slightly different end caps and the position of the cassette will be effected each time a different while is put in the drop-outs. it should only require a little tweek of the mech. Putting an 11-speed hub wheel with a 10-speed cassette on with have a noticeably different cassette position to a 10-speed hub/cassette combo
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JaRok2300




Joined: 01 May 2014
Posts: 210
Location: Worcester, UK

PostPosted: Tue Aug 29, 2017 3:07 pm    Post subject: Reply with quote

Thanks for the replies.

All of mine are 10 speed so it's the difference between Tiagra, other Shimano and SRAM cassettes.

I think I've got the right hub, cassette, spacer combinations so it's probably down to the minor variations in the hubs as you describe.

Having said that if I can get them all within a gnat's of 4mm from the end of the axle then adjustment should be unnecessary when swapping.

This assumes there is enough thread engaging once I add the 1mm spacer otherwise I will just have to accept them as they are which is hardly a disaster. #1stworldproblems
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