Isn't the Roam more of a mtb style hybrid vs a true mtb? I think they come with pretty skinny tires like 35 or 40mm so there's not a lot of mud clearance. You might want to try the fattest XC (cyclocross) tire you can find, prob 35 or 40mm max. CX tires have knobs like a mtb tire but will work for you on pavement too. For mtb tires, you might look at Specialized's Fast Trak 2.0, knobby but not so aggro its noise on pavement won't drive you nuts--their Renegade 1.95 is good too. However, I'm thinking a 1.95 or 2.0 might not fitů As for changing tires for street and trail, it's a pain and a huge hassle. My friend does it and hates it so much he just leaves his knobbies on for his commute.
Last edited by bikeme; 01-27-14 at 11:47 PM.