Originally Posted by
GrayJay
You can purchase a 9 or 10 speed index plate (ebay) to convert your old 8-speed ergo shifters into either 9 or 10 speed ans then there are more options for making the shifters play well with shimano 8 RD.
Wrong.
You need
way more than the index ring. The pivot diameter changed. A conversion from 8sp to late 9 or 10spd requires nearly every single part from a 10spd lever. While it
can be done, buying an 8spd RD or selling the 8spd ergos and buying different ones will be
far cheaper.