help with gears please

theraggyone
theraggyone Posts: 147
edited April 2016 in Workshop
I built my latest road bike last October with full Sram rival 22 (GXP compact chainset,11-32 cassette , force 22 front mech and rival 22 mid cage rear mech) and i had no issues at all with set up etc it all worked flawlessly .

For my 40th birthday in march i got a Sram red 22 GXP compact chainset , force 11-26 cassette, new GXP BB and force 22 short cage rear mech with a new 11 speed Sram chain.

i fitted all of this with no problems at all and it shifts brilliantly .Overall im really pleased but there is one thing that bugs me. in the big - big combination and second biggest - big ( i know cross chaining is bad) if i back pedal half a turn my chain comes off of the inside of the big chainring .This isnt usually a problem except when stationary and moving the pedals to position to set off but it is starting to annoy me as it never happened with the rival set up and i dont seem to be able to stop it, does any one have any suggestions?

is the sram red 22 chainline differant to the rival 22 one?

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