My bike wheel was recently stolen and I found this old Bontrager AT-550 wheel in my shed. It's a 29er from my research and I'm wondering what size tyre would fit that would be decently smaller than the current tyre. My bike is a hybrid with a 700cx42c back tyre and the front tyre is 29x2.2 and it would look ridiculous to have a big tyre in the front and small one in the back. I'm sorry for mixing the units the measurement but I'm new to this and would appreciate some help. Thanks!