-
If it's the same bcd could you swap chainrings?
9 speed has inner ring slightly over to the outside so the thinner chain can climb onto the big ring. This is the potential issue if you run a 8 speed chain in that it might rub when using the inner ring as 8 speed has slightly wider plates in its links, though irl it's normally fine.
If it does rub you could use a 9spd chain - I've done this with a 9spd fsa chainset friction shifting over a 7spd block with no issues. However if you're using indexed shifters I imagine it might make shifting at the back a bit tardy.
Yukirin-
I've done this with a 9spd fsa chainset friction shifting over a 7spd block with no issues
Although you're not guaranteed to have 'no issues' when using 9-speed chain on 8-speed sprockets, as the transition from 8 to 9 was the major change from 3/32" roller width to 11/128". In most cases, the 7/8-speed sprockets were already thin enough, but there's bound to be an exception out there.
gbj_tester
William.
Cross posting from bottom bracket thread.
Sorry if this has been covered before, but I've tried searching and can't find it.
I run an 8 speed drive, but want to upgrade my crankset as they are heavy, wide and too long. Will my 8 speed chain and 8 speed Claris FD run ok with this 9 speed tiagra chainset?
ebay.co.uk/itm/111221124445?_trksid=p2055119.m1438.l2648&var=410241060291&ssPageName=STRK%3AMEBIDX%3AIT
From other forums I've read, the general consensus seems to be "it might work but you might get chain rub". Wondered if anyone on here had direct experience of the issue. Thanks x