I'm also curious about this, but more specifically, if anybody has put mtb, studded winter, or gravel tires on the Pace. I would expect the clearance to be slightly smaller for tires that have knobs on them like mtb or especially winter tires on them. For that matter, I would suspect there would also be clearance issues with fenders if you have them -- I actually don't have any fenders yet, but I would surely need them if I'm thinking of taking the local trail connectors to the bike paths; I imagine larger tires might mandate using a third-party "universal" alternative rather than the Aventon-branded ones?