What it exploded?

[knonist]

Why it exploded?

I was fitting a pair of Marthon Plus 700 * 32C to bontrager SSR today.

It supposed to be a stright forward operation; my previous tyres were Bontrager Race Lite Hardcase, 700x28C, with 28-32C tubes.

Not to mention the 6 hrs operation, I would like to find out why both 28-32C tubes exploded at 80-90psi? one of them expolded a few minutes after being inflated, and the other one exploded whilst inflating.

Then I changed to 18-32C tubes and it all went OK, anyone know why? these tubes are hard to find.....

 

[MajorMantra]

Maybe you trapped the tubes between the tyre beads and the rims. The 18-32 tubes may be a little smaller and hence less prone to getting trapped.

Matthew

 

[knonist]

Maybe you trapped the tubes between the tyre beads and the rims. The 18-32 tubes may be a little smaller and hence less prone to getting trapped.

Matthew

I have squeezed the tyre to checked the inner rim wall several times before inflating, it seems to be fine

 

[MajorMantra]

Maybe the tube was twisted? I'm guessing wildly here.

Matthew

 

[Theseus]

Explosions occur when the tube can expand beyond normal operating limits. Tubes can expand either through the spoke holes (check your rim tape) or where the tyre has come off the rim (check that the bead is properly seated before fully inflating).

It could be that there is a big enough hole in your tyre to allow the tube to poke through.

I once borrowed a bike that had tyres that were a pain to get properly seated on the rim, all would appear OK until the furthest point from home on a ride and then they would let go with an almighty bang. One time a car screeched to a halt as the driver thought she had hit me. After the 3rd time I started paying particular attention to the bead seating after every stroke of the pump.

 

[knonist]

Explosions occur when the tube can expand beyond normal operating limits. Tubes can expand either through the spoke holes (check your rim tape) or where the tyre has come off the rim (check that the bead is properly seated before fully inflating).

It could be that there is a big enough hole in your tyre to allow the tube to poke through.

I once borrowed a bike that had tyres that were a pain to get properly seated on the rim, all would appear OK until the furthest point from home on a ride and then they would let go with an almighty bang. One time a car screeched to a halt as the driver thought she had hit me. After the 3rd time I started paying particular attention to the bead seating after every stroke of the pump.

The rim tape on both wheel were fine, it think it must either be the bead or the tube (what can happen to a 28-32 tube on a 32C tyre?)