im looking for a few words of advice, or a solution to a problem thats still eluding me. - new bike, as of yet unridden out of the workshop, with a nasty ghost shift under load.
frame - kinesis maxlight (easton ultra light) 18"
cranks - xt hollowtech II
chain - sram 99 hollowpin (no split link, chain is hard joined)
cassette - sram pg980 11-32
mech and shifters are sram x7
ive been working with bikes for a number of years now, put ive never had such trouble...
the chainline is set central (middle ring + 5th sproket produces straight chain line) ive removed the split link, ive tried a few different chain line spacings on the BB, rd is adjusted perfectly with brand spaking new clarks preium cables.
under load (load considerd to be hard in saddle acceleration, or climbing in the saddle) the chain will jump up the cassette onto a larger sproket, it does this in all 3 front rings, producing a potential face + stem smash.
the frame is a very lightweight (1600g ish) ride, it has got a fair amount of flex in it, but not so much to lengthen the gear cable run enough to cause an upshift.
now can anyone here think of anything ive missed out in hunting for the problem ? or have any other ideas how im going to sort out my new steed ?