I fitted 10mm spacers to the front,and 12mm to the rears during the week,all seemed ok,but i've only been driving locally. I took the car out on the motorway this weekend,and noticed quite bad vibration,seemingly coming from the front,as i felt it in the steering,most noticeable between 70-80,and ok at 85. Could it be wheel balance exaggerated by the spacers (H&H hubcentrics)? I haven't noticed it before though! Or maybe that the locking bolts were 5mm too long on the front,and i didn't bother cutting them down? I've checked that the bolts are tight,and the wheel balancing weights are still stuck on....and i haven't bumped over a kerb or potholed them,so balance should 'theoretically' be ok. Any ideas guys?