I'm type II and bike riding helps me so much. I get to eat, no *have* to eat, lots more carbs when I'm riding. My A1c is about 5.2 thanks in part to riding 100+ mi./week. I just did my "ride your age in miles in a day" ride, 62 miles.
I always test before I go out and carry dried fruit & nuts to nibble, along with a few gels, just in case. Be careful, but do ride, it's a great way to help control your diabetes and generally stay healthy.