well as usual it seems my post wasn't clear enough for everyone,so in case you read it wrong, i have just bought a new lrp x11BRUSHLESS MOTOR, and hadn't realized it came with sintered rotor as standard, i haven't measured it myself but from the guys advice above it seems the WIDTH of the sintered rotor is 14mm,which is what i was asking,thanks for the answers, ttt theres always one isnt there. lol