Richters Pass and the Rollers are well known in Triathlon as part of the Ironman Canada and Challenge Penticton Long Distance Triathlon Bike Course.
Testing yourself out on this 7km Hill at 4% grade is always challenging. Riding from Osoyoos is about 11km to the Summit. Follow it up with the Rollers on your way to Keremeos and you have a nice 90km out and back with some amazing views of the Similkameen Valley.
A good place to start for this is the gas station in Osoyoos. The information center here will also help you out for other activities in the area.
Riding from Penticton is 130km+ round trip depending your route.