MTB tyre blow out

[CuanL]

I had a blow-out on my MTB on Sunday – have you ever had one? Tyre came off the rim, tube then exposed itself and exploded. I was only doing about 15kph. What causes this – pumped my tube to 3.5 bars, tyre says it can take 5 bar?? Maybe the tyre wasn’t properly seated in the rim? Could it have been caused by riding into a hole in the road – I didn’t notice anything before it just came off the rim.

 

Could I have your thoughts to avoid this next time?

 

Thanks

Edited February 9, 2011 by CuanL

[david16v]

One word: TUBELESS!

[Mojoman]

3.5 Bar is quite hard, I ride 2.1 Crossmark and 2.0 larsen and pump to around 2.8-3 Bar. What size is the tyre and tube?

[Top Fuel]

Faulty Towers I mean Faulty tyres?!

[CuanL]

Bike is a Schwinn Hybrid, only ride on tar.

Wheels are Alexrims PC 19

Tyres are Continental double fighter 2 code 37-622 (nearly slicks, slightly bigger than racing bike tyres)

Size 28 x 13/8 x 15/8

Max pressure is stated as 5 bar/70 psi

 

Tube that had blow out after tyre came off wheel was 700 x 28/32C (has large valve).

It is slightly smaller than the original tube which was a 700 x 35/43C (small valve), not available at local bike shop with large valve (much easier to pump up at garage).

The tube had a seam and was about a year old. It popped and split down the seam for about 100mm after it was exposed to the tar.

Is it possibly a problem using the slightly smaller tube in this size of tyre?

[Mojoman]

Prehaps there was an issue with the seam on the tube, I have had a couple of Kenda tubes split on the seam.

[levett]

My suspicion is that the tyre was not seated properly, and came off the rim. A tube will only stand significan pressure if it is 'contained' once it is not, the tube will try to expand to equalise the pressure inside and outside and it can not stretch that much, so will 'explode'.

 

I had one once where I didn't seat the tyre properly, and inflated the tyre to max to 'push' the tyre up onto the bead (crossmark tyres on my rims are difficult to 'push up' to seat right against the rim sidewall) and as I watched, the tyre started to 'peel off', the tube started to appear, and then there was a big bang! The tube had slime in - I was covered in slime, as was the kitchen!

 

So eirther a trapped tube (but that would have burst sooner I think), or the tyre not seated properly.

 

The only other thought, it to make sure that the rim is not too wide for the tyre!

[CuanL]

Thanks everyone for your input!

Edited February 9, 2011 by CuanL

[Inusc]

once had and mtb blow out Fell my gat off!!

[Just Keep Pedaling]

"The tube had slime in - I was covered in slime, as was the kitchen!"

 

Awesome!

 

Photo?

[Hardtailrider]

"The tube had slime in - I was covered in slime, as was the kitchen!"

 

Awesome!

 

Photo?

 

There are people willing to pay a lot of money for that sort of thing...