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I reckon I need to use some spacers on the middle (big) ring to move it slightly closer to the small ring to stop the 10 speed chain slipping between the two.
Are 0.6mm spacers likely to be what I need, or bigger? At a quid a go, I dont really want to use trial and error.
In case anyone picks this up this evening...
I've now got a few 0.6mm spacers to reduce the gap between the 2 chainrings - does anyone know if I need to move the big ring towards the small ring, or vice versa? Maybe just trial and error to see which option achieves the best chain line.
I assume that you have put a larger granny and or middle ring on. How many teeth are there on the 2 chain rings as the front mech will have a maximum number of teeth difference that it can cope with.
For example a front mech that works with a 22/32/44 triple may have a max capacity of 12 teeth, that being the difference between the middle an outer ring. If for example you now have a 22t granny and a 38t middle you may have exceeded the capacity of your front mech.
The rings are 26t and 39t, plus the bash that has replaced the big ring.
But shifting isnt the issue, just the occassional slipping of the chain between the 2 rings.
I'm assuming that the the spider differs a little between 9 speed and 10 speed chainsets, in that the 9 speed rings are set a little further apart?
9 and 10 speed triple cranksets have the same spacing. The difference is the outer edges of a 10 speed chain are narrower than a 9 speed. The inner dimensions of the chain are the same. So a 10 speed chain work fine on 9 speed chainrings and 9 speed chain will work on 10 speed chain rings if you had the correct 9 or 10 speed cassette.
Thanks. So I will be creating a slightly false chainline to sort out my problem.
Spacing the chainrings is not necessary. Setting the front mech up correctly for a 10 speed chain is what is required as long as you have the correct mech to cope with your 13t range.