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Shimano Centerlock Lockring - MTB vs Road?

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Shimano Centerlock Lockring - MTB vs Road?

Old 03-20-19, 06:15 PM
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TimothyH
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Shimano Centerlock Lockring - MTB vs Road?

Question: Is there any difference between Shimano road and MTB lockrings?

My new road wheels (Industry 9 Torch) use 15 mm thru axles and the internal spline lockring which comes with the rotors will not work.

I need the Shimano SM-HB20 external spline lockring for 15/20 mm thru axles but inadvertently ordered ones which do not say SM-HB20 anywhere on the product or in the description. The description says "XT M8010" which indicates it is for mountain bikes. Searching for the actual SM-HB20 lockring yields nothing outside of Germany and eBay.

https://www.backcountry.com/shimano-...rotor-lockring

I'm pretty sure the one labeled XT will work but hoping someone knows for sure. Photos below appear the same.

This is the SM-HB20 lockring


This is the XT M8010 lockring


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Old 03-20-19, 06:34 PM
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wschruba 
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You may need a low-profile lockring, but if it clears the fork, there's no functional difference.
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Old 03-20-19, 06:43 PM
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Originally Posted by wschruba View Post
You may need a low-profile lockring, but if it clears the fork, there's no functional difference.
Thanks.

It is a gravel fork so I think I'll have plenty of clearance.


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