In May I'll be going to Southern Illinois for 10 days to stay with some friends of mine. I will mostly be riding around the town, but one day I am going for a ride with a friend. It's a gravel trail, and she has an mtb, but I want to ride my Trek 610 which has 27x1 1/4 tires. I've ridden on bits of gravel before, and it seems fine. I just wanted to know if this is bad for my tires. They're pretty cheap Forte GT2s (slicks), which may be replaced by Armadillos by then.
Thanks for your input. If this will trash the tires then I can take the tank instead of the roadie.