i tried sun m14 a and matrix iso c 2 ,
narrowest ones i know.
they still work
i have never seen a roadracerim that doesnt work with 35 mm tires
i know some people which use rigida dp 18 witzh 47-622 tires.
UKCyclocross is simply here for you. It's not-for-profit, and there's no joining fee, and never will be. I've set it up because I wasnt to make the most of the community I see out there at the weekend races and give them a place on the www that people can post their own content to easily.