With 6% blend there is no galling

"It's complicated, it all depends on how the caliper is attached to the chassis, but in practical terms it doesn't make much of a difference. Set you kart on a stand, get the engine running, give it gas, then brake: you'll see the rear end 'lift' unp. This is the effect that brakes have on the chassis and it doesn't change much from a traditional assembly to one with radial attachment. The only difference is that radial calipers are anchored tight onto the chassis, so their deformation under stress is minimal."