er, iirc…
isn’t there a difference between roadie 10spd, and mtb 10spd?
ie. roadie 10 cassettes are narrower than mtb 10 cassettes – which are the same width as 9spd.
the roadie10 cassettes are available in a size that an mtb may well consider ‘adequate’ – so we’ll buy them, only to find they’re not *quite* right… (i may or may not have found this out the hard way)
(i think is right, it certainly explains a few things…)
anyway, i’m not sure 10spd really counts as an upgrade for a road bike. it was sort of a short-lived dead end. imho, upgrade properly, to 11spd 105, or just get new(ish) Sora, which is cheap, back-dateable, and really really really good.