By way of a BTTT and i shouldve paid attention in Maths class.........
Can someone work out a Final Drive ratio for me ; well two actually depending on tyre availablity

630 & 645 profile ( roling Radius )

7000 revs and i'll need between 145- 150 mph .
this is 1.1 final drive from gearbox , please

sorry to hijack your post .!
tony