What size ring are you running in the front? I'm thinking of converting from XTR to this setup but I'm concerned that the gearing may not be flexible enough for my "early season out of shape climbing" ability! Also, how much of an effect is the wheel size on the gearing compared to a 26'er? Currently quite happy with my 5 Spot but it's 2 years old now and I'm starting to get the itch for a new bike.