I have 4 different size bikes - 1 girls 20", 1 girls 24", 1 girls 26" and a man's mountain bike. The process of getting these 4 bikes onto a bike rack isn't easy. I'm pretty good at it now that I've done it a few times but it still isn't fun. That's the reason I returned this version of the Allen 4-bike trunk rack and purchased the Allen Sports Premier 4-Bike Trunk Rack.