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So I might be missing something very obvious by why is it that to fit an 11spd cassette onto a mountain bike we would need to buy a new compatible free hub body, yet on a road bike they can make them to fit onto a standard free hub?
Something to do with the larger 42T ring??
Shimano's new 11 speed XTR fits a standard freehub.
SRAM's 11 speed doesn't, because the smallest cog is a 10t which is a smaller diameter than a standard freehub will allow
You cannot fit 11 speed Shimano on a standard 10 speed freehub body. You will need a new freehub.
I'm not sure what happens with the new XTR because I've only seen internet reports, but I think this fits on standard 10speed because the 40T is big enough to fit around the spokes and it uses a normal 11t small cassette sproket.
I see so it's because of the 10t cog. Good to know that Shimano 11spd will fit a standard freehub.
Personally I dont think I would ever benefit from having a 10t over an 11t as my smallest. Would much rather be able to keep my standard freehub.
@traildog - you can with 11spd road cassettes, have just done it with my new Ultegra groupset. I had an older wheelset and just used a thinner spacer* (goes on before the cassette). Newer road wheelsets are 9/10/11spd compatible.
*worked on my Mavic free hub anyway, not sure if this applies to others 😕
Something to do with the larger 42T ring??
Other end - the 10t needs the special freehub body.
11 speed road needs a wider freehub body, 11 speed XTR doesn't, because the largest sprocket is so large it's offset toward the spokes, so it all fits in.
Mavic always used a non-standard sized freehub from the start so you needed a spacer even with 9 speed. I think it was maybe campag sized, but with the shimano pattern on.
'Standard' 8/9/10 speed shimano freehubs require a new one for 11 as it's slightly larger.