Originally Posted by
DCB0
Also, modern bikes all have 'hook type' rims with a bump on the rim sidewall to better hold the tire on. Many older biked have straight sided rims which take more care to inflate AND can not tolerate the same pressure. Many good quality 27" tires say they can take 100 to 125 psi,. but with straight sided rims should probably not be inflated past 90psi.
i agree. this is most likely the problem. non-beaded rims have a max inflation that is quite a bit below that of beaded tires. you either need new rims or new wheels, preferably 700c, altogether.
if you live in the bay area, pm me, i've got a set of 27" araya 1/ 1/4 w/o alloy rims with freewheel hub that i could let you have. i doubt i will be needing them anymore and would like someone to get some use out of them. they even have tires and tubes on them!
i would hate to see somebody dump a nice old miyata just because the wheels are lousy.