I might have squeesed out another 500 mi from the orignal without killing myself but at 5600 miles I installed a Potenxa 165/65/14 today. But to the story...after a lot of sweat and tears I finally got the old tire off and much more sweat and big tears I got the ct on. Then came time to air it up. Fifty lbs and no seat, more air 70 lbs ...nothing, 100lbs!! Still nothing. Left it over night....The same. Broke it down again urbber the soap off of evey thing and gave tire and rim a good coat of valoline. Then same as above, so more air 120 lbs and the damed thing seated but sounded like two gun shots. Should have warned the neighbors. Took a 50 mile test run ( I have never riden a ct before ). What a difference!! I love it, and when its time I'll do it again. **** things are tough down here in Texas....