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Indeed. Rotor size has no effect on the maximum loading on the fork, on any bike where the brakes are powerful enough to lock up the front brake. Anyone who disagrees should immediately go out and buy L-shaped cranks. The limiting factor is how big a brake disc you can fit before it hits the inside of the fork leg. It's a geometric limitation, not a strength limit.
Brommers-
Rotor size has no effect on the maximum loading on the fork
If the caliper is further away, there's more leverage on the mounting post, no? I'm genuinely asking because physics was lost on me at school
The limiting factor is how big a brake disc you can fit before it hits the inside of the fork leg. It's a geometric limitation, not a strength limit.
On fork legs that taper, I get that. But on a straight legged suspension fork, the rotor will never touch no matter how large a rotor. Yet there's a maximum spec'd size from the manufacturer. I appreciate I'm including all forks in this debate, road and MTB
TooTallTim
The tire is always the limiting factor in braking force (or overturning in case of full front brake). So for a given torque, a larger rotor will put less force on the fork.