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Frustrating lack of published info on freehub length

pwarren3030pwarren3030 Posts: 5
edited October 2019 in MTB workshop & tech
Hi Forum,
This is my last resort if anyone can find info on freehub length necessary to upgrade from 7 speed to 9 or 10 speed.
My 7 speed Shimano hyperglide is 35mm long but at some point the standard length seems to have been increased to 39-40mm. No suppliers give out this info. Hoping someone has solved this dilemma.

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