I think I may have out of ignorance ordered my Mark V with a 48/14t, or was it 16t? I cant remember and Tony is at the hospital with his wife having a baby so I can't ask right now. Reason is I was talking with an aquaintance who is himself pretty new to fg bikes and I was describing the IRO that I ordered when he said I may have some serious issues with wearing through tires fast with a 48/14 or 16t set up because when i skid or skip I will be wearing the same part of the tire. If this is true I want to email Tony and have him switch it to a more suitable ratio. I live on the east side of SLC Utah and I will be dealing with some hills at times. I am 5'8 and ordered a 53" bike. What are your suggestions?