Hope someone can help,
After replacing tires and the tubes on an old 10 speed with 27" wheels. I had two blow outs in three days. I am convinced that when I put air in the tires the tubes are actually lifting the tires off the rim slowly and when it lifts enough the tube comes out and BANG!!!.

One went BANG while I was eating dinner last night.

The guy at the LBS when selling me the tires showed me two tires one was smaller and lighter and the other was larger and much cheaper. I went with lighter and smaller. I asked him how much air should I put in them. He said just put in what it says on the tire.

Tire: Cyclepro Discovery 27" x 1 1/8. 105 lb.

Tube: Cyclepro on the tube box:
700X28-35C
27x1/8 - 1 1/4

Rim: ARAYA 27 X 1 1/4 W/O HP. Japan

Last night I put just 85 lb's in and this morning I can see a white line starting to show just below the gumwall. With time this white line gets bigger. I am convinced that the tube is actually lifting the tire off the rim even at 85lb's

I asked the guy if it was OK to use tires that say 27"x 1 1/8 when the rim says 27"x 1 1/4 and he said it was fine.

I have attached a picture of the blow out. Both tubes went the same way.


Any thoughts about this?

Thanks for your help,
J B