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@lsegeorge
I am back home so I had the chance to investigate further.
Cassette spacing:
Was not easy to confirm with calliper but I am quite sure that spacing is consistent as the calliper fits snugly in-between all the rings.
Before rebuilding or acquiring new ergos I wanted to establish that they are the cause of the problem. I have noted the following which may be useful for confirming that the ergos are the problem:
1) When shifting up there are times when the dérailleur shifts into gear but does not stay there (it shift back down).
2) To shift up from the smallest ring I either need to overshift or to overtension the cable (hence messing up the rest of the gears).
3) When I pull the naked cable the shifters clicks and dérailleur shifts down.
Any feedback appreciated.
Also if anyone has a spare set of ergos pls let me know. I will also post in classifieds/wanted. Could be interested in 9 and 10 gear as well as I am also considering upgrading my wheels!