As mentioned previously on this blog, this is a motard style conversion of a Honda CRM 250 using a 2007 model Aprilia RS-125 wheels, discs and front brake caliper.
A custom bracket was designed in Solidworks to adapt the radially mounted caliper to the original brake caliper mounting holes. Designing in 3D allowed the part to be simulated (FEA) with heavy braking loads and calculate the factor of safety, stress, strain and distortion.
One of the advantages of using the Aprilia wheels over the popular wire spoke wheels is that they incorporate a cush-drive to reduce driveline vibrations.
Testing found the brakes to be more than adequate. The bike was a lot quicker to turn into corners due to the increase in headset angle created by the switch from 21″/18″ wheels to 17″/17″ wheels. The bike also stood up out of corner leans much quicker too. If desired the characteristics could be toned down by making custom extended dog-bone suspension links to drop the rear of the bike and reduce the headset angle.
The biggest improvement was the cush-drive. This gave a slightly softer feel to the power delivery but really smoothed out the “snatchiness” felt when cruising or decelerating.
Overall a brilliant motard.