If I start a slow process of changing over to ten speed, can I start with a new chainset and run it in my existing 9 speed set up? ie 9 speed chain on 10 speed rings. Anyone doing it? Any problems? Ta.
9-sp chain on 10-sp rings will be fine.
10-sp chain on 9-sp cassette will be fine.
10-sp cassette needs 10-sp shifter and 10-sp chain to work properly.
10-sp chain has same internal sizing as 9-sp but thinner plates.
Some triple 10-sp chainsets may have different spacings and your front mech may need adjustment, but should be made to work as they only have the middle ring indexed....lower is limited by end-stop and large can be limited by end-stop. Suck it and see.
PaulD
Cheers for reply 😀 The closer ratio chainset appeals to me, might just give it a go.