Thanks Tony for the reply, dont know how true this is but when i got the wheels (Second hand) they were terrible (wobble/vibration) I had them balanced and the issue was more or less resolved, the tyres were buget tyres by the previous owner. When the wheels were checked out it was found that 2 of them were slightly out of true, the guy spent a lot of time sorting them for me (I took the to a chap in Melton Mowbray) he also refitted the tyres, he said that one of the tyres could not be seated correctly on the rim due to them being badly fitted by the previous person? and he also said that it had a flat spot. Since he did the job they have been great but at about 65 - 70 the wobble/vibration comes back, i have fitted the wheel on the rear, it is strange because the wobble/vibration is not always apparent, it sems to be ok when the tyres are cold, its only when they warm up that i get the problem on the one wheel.