Hy,
I did mine myself, i had 7,5*
In fact, i did a couple;
1.-Honda 450cc 1969 chopper (at the end of 70`s :eusa_dance: )
2.-My Vmax 1998; 7,5* (in 20011, + or - 50,000Km ago)
3.-Flat-Black-Fazer project with VMFnet member ``SPEEDCOSTSMONEY`` wich i had 7* or 7,5* (i can`t recall) combine to 3 inch extended swing-arm (in 2012)
4.-Kawasaki 1000 drag-bike 7,5* with extended swing-arm, I will redo this one this winter; 7,5* was`nt enought for drag (9,5* or 10* should be better) (in 2012)
for my Vmax, i ride avon venom am 41 -- 120/90/18 and am 42 --170/80/15 with 1 1/2`` shorter progressive rear schock with front fork tube lower of 1`` and it goes realy FKN well, short cornering have not realy change, curve is also almost the same. Only have to cut the kick-stand, and WATCH FOR STREET BUMP because it is verry low now.
The only thing i can tell; Don`t be scared for your bike, just find the right guy to do it,