As of now, i ride my bike everyday, mainly for fun, and to go to work. Being that im in san diego, when school starts in the fall, ill be going full time mon-th and also working 5 days a week still. I have about 4,000 miles on my stock BT0-15s. Hopefully by August 24th, when school starts, ill need some new rubber. Would it be better to get a comuting tire, BT0-21, as ill be going back to school and work all during the week, and not hitting the beach or canyons like i try to now, as opposed the BT0-16. I wanted to throw the 16s on, but back and forth to school and work come fall, i think it'd be a waste. even tho there are sunday rides. what do you guys think?