Interesting; my road bike knowledge dwindles significantly past the era of 7 speed. So not wishing to derail the thread too much but that suggests that the correct 10 speed cassette is literally just an extra cog; with the same spacing yes?
No, the sprockets on 10 speed are closer together but the clicks on the shifter are also closer together by proportionally the same amount. Thus it pulls less cable and moves the mech less distance per click.
Interesting; my road bike knowledge dwindles significantly past the era of 7 speed. So not wishing to derail the thread too much but that suggests that the correct 10 speed cassette is literally just an extra cog; with the same spacing yes?