DanielMaia
Member
My first thought was --> yey, an expansion chamber into a tyre
The problem I have had with curtain tires on older rims is that the specks for the rim on a hook bead tires have changed. Now I noticed this on a much older rim and a new tire but the same holds true I think.
If you take the tire off the rim there should be a ridge that goes around the inside of the rim. this is known as a "hook bead" rim If your rim does not have these "hooks" the modern mountain tire will blow off. The same thing happened with road bike tires a few years earlier. I can't say for sure if this is the case but that might well be the problem with your rim.
mike
Exactly. Bike tires are the case where 2.125 does NOT equal 2-1/8... Tires made for 26" that are marked in fractional sizes (26" x 1 1/2, 1 3/8, etc) are for the non-hooked rims such as found on on old 1970's 10 speeds. Millions of these bikes abound in cities, backyards, and scrap heaps everywhere.
Tires made for 26" that are marked in decimal sizes (26" x 1.5, 1.95, 2.1, 2.25) are the NEW mountain bike size, and are what is sold on mtb and beach cruisers all over USA now except possibly the cheapest or old-stock dept bikes such as K-mart or Toys R Us...