Any one know if sram x9 will run with shimano ultegra rear mech ?

Anything denoted X in SRAM won’t work with Shimano. Named (Rocket I think is one) will work with the Japanese S.

no it wont work if its any use i think i have a 8 and 9spd halfpipe shifter that works with shimano(attack iirc)

Mister P is right, SRAM rears have a different “actuation ratio” to Shimanos, and so the ‘x’ series which is designed for SRAM rears won’t work. SRAM and Shimano fronts are compatible tho’ so you can interchange changers on the front.

The highest Shimano compatible twist grips SRAM make are the ‘Attack’ – you can get 8 and 9 speed versions from wiggle or CRC. Be warned the ‘Amy’ grips on these aren’t very good for large sweaty hands like mine, so I upgraded them with a pair of chunky XO grips!