I tried to mount the 32 mm SKs on Sun CR 18s with tubes. I couldn’t do it - first time in my life to fail to get a tire on a wheel. I finally got them to fit on Mavic Open Sports using soapy water, Pedro’s steel reinforced levers, and every other technique I coulf find. Then had a flat, probably due too overly aggressive use of the tire levers. They went on easier the second time and have worked fine since.