Stock rear on the 73a is 140/60/18, i have got a 150/60/18 on right now, and it great.. misses the hugger by about 10-12mm, but has anyone tried a 140 or 150 with a 70 profile? Avon do the road rider in this size, and the price is great.. about £87 ish.. would be great if they fitted, has anyone tried it?

It will be very close and will screw with the gearing.
Bt90 or Bt92 in 140 or 150 is best tyre giong.