wow, i was running 101 GI i think and now im at like 93. come fall, when i go back to school in pittsburgh ( a super hilly city) im going to swap out my 15tooth for my 17 tooth cog. philly is a great city to ride fixed in but when you get out of center city there are some hills and those hills kill my knees. well, id assume its a good thing to be about 20 years old and have daily knee pains attributed to tendonitis.