Back at this...

I believe the worst case bakfiets clearance is an 80" wheelbase with a 6" ground clearance. By my calculations (it's been a long time since I did geometry) then a 17° slope down from a flat sidewalk should be sufficient but for a bit extra clearance just in case maybe 16° max which would be a 28% grade or 1 in 3.5 rise/run. Does that sound correct?

Thanks,