I love the boot. I had to dremel a small spot for the second wheel, the footbed has a channel in it but it wasnt quite deep enough. I put the 76 in the front by choice, the rocker effect helps with tight turns and still allows good grip in the front. To put an 80mm on the front would require some dremeling but not as much as I initially thought, maybe a mm, because the 76 easily has 1 - 1.5mm of clearance now. As for drilling, a few holes were able to be re-used but I think a little over half had to be drilled new.