So....to sum up....Bike 50lb and 62In = $150, Bike up to 70lb and 115in = $150.
Over 70lb up to 100lb = Overweight fee + $150. Over 115in = Oversize fee +$150, You could be charged Overweight/Oversized and the $150 base fee.
Any questions? This is how it's "supposed" to work. YMMV whether or not you get charged anything.