what is the measured chain line in the back ? parallel line to the CL thats where that 1 cog would be so chain bends no more to the tiny cog than to the big one.

thats why the middle chainring lies where it is..


wonder away .. Or buy several lengths and try each .. No clue what crank you have and I cant help over the web anyway,,

Drop by a Shop ... 1st hand in Person is Better.