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Shimano 1mm spacer for 10sp cassettes - when is it needed.

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Shimano 1mm spacer for 10sp cassettes - when is it needed.

Old 12-08-13, 10:50 PM
  #1  
jtolive
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Shimano 1mm spacer for 10sp cassettes - when is it needed.

Had some cracks on a Shimano WH-7800 rear rim. Decided to replace the wheelset with DA C24 clinchers. It came a 1.85mm spacer to use other cassettes.

When I removed the DA cassette(10sp) from the WH-7800 there was no spacer in use.

I installed the DA cassette on the DA C24 clinchers using only the 1.85mm spacer. It seems be just fine shifting wise - probably have ridden a few hundred miles.

Some things I have read indicate that you should use the 1 & 1.85 spacers with 10 speed cassettes on a 11 speed hub.


Should I have used a 1mm also?
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Old 12-08-13, 11:55 PM
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Rule No.1 for cassette installation.

The outermost sprocket must overhang the front of the cassette slightly so the lockring can compress the cassette without bottoming against the face of the freehub.

Rule Nos. 2-10 ---- see Rule No.1

Rules' covering when to use a spacer or not, see Rule No.1.

Rule No.11 --- As long you've met the condition of rule No.1 you may add or subtract thin spacers or shims, so the relative position of the cassettes on various wheels to the dropout face matches on all of them. This allows switching wheels without needing to adjust RD trim.

So in answer to whether to add a spacer, or which to use ----- See rules No.1 - 11
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Old 12-09-13, 09:32 AM
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+1 to Francis! I've installed cassettes that were otherwise the same (brand, cog count, range) but did/didn't need the spacer to positively secure the cogs when the previous cassette didn't/did need the spacer. Figure that one... Andy.
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Old 12-09-13, 09:36 AM
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I've been using 2mm spacers for 10 speed Shimano cassettes on 11 speed Shimano hubs, works fine.
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Old 12-09-13, 12:05 PM
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As a rule, Shimano 8/9/10-speed freehub bodies require the 1 mm spacer behind a 10-speed cassette. Shimano 10-speed only freehub bodies do not require the spacer. 11-speed freehubs do require at least one spacer to use 8/9/10-speed cassettes but I don't know if the 10-speed cassette requires both. However, as Francis detailed, if it's tight, you are good.
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Old 12-09-13, 06:13 PM
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Thanks for the help!

Guess I have too much extra time. When installed it was good and tight but I was second guessing myself.

But now that I know to only worry about Rule #1 - problem solved. I was getting worried about Rules 2-10. My bad!

Thanks again,
Jay
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Old 12-09-13, 07:26 PM
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Originally Posted by jtolive View Post

....But now that I know to only worry about Rule #1 - problem solved. I was getting worried about Rules 2-10. My bad!.....
I only added rules 2-10 because so many people can't stand anything so simple. However Rule 11 is important for team mechanics, who platoon rear wheels, and anyone else who mover wheels bike to bike. Otherwise rule 1 covers everything.
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Old 12-10-13, 01:12 AM
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One more little tid bit. 10 speed tiagra cassettes do not fit Shimano 10-speed only free hub bodies. They don't have enough clearance to fit over the over sized splines on the 10 speed only free hub body and the tiagra cassettes have the spacer built in. Just found that out and had to order a 105.
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