Arrrgh - tyre keeps exploding!

[Paulus]

Front tyre/tube on my 1977 Galaxy keeps exploding. I have changed the tube three times now, and when pumped up to the max for the tyre, 85psi the things goes off and blows the tyre off of the rim. Is it time for a new set of tyres??

 

[vernon]

Check that your rim tape is covering the spoke holes....

 

[pauldavid]

To be fair youve done well if they've lasted since 1977, treat yourself to a new pair

 

[Tim Hall]

It's the other way round. The tyre blows off the rim, allowing the tube to explode. So yes, it might be a knackered tyre bead allowing the tyre to blow off, or it could be a worn out rim flexing as pressure increases again allowing the tyre to blow off.

 

[MichaelW2]

Is it 27" or 700c tyre and rim? Are you mixing them?

 

[shouldbeinbed]

It's the other way round. The tyre blows off the rim, allowing the tube to explode. So yes, it might be a knackered tyre bead allowing the tyre to blow off, or it could be a worn out rim flexing as pressure increases again allowing the tyre to blow off.

+1

 

[Ian H]

Assuming it's a hook-bead alloy rim, it may well have got thin enough to be on the verge of failing.

 

[Accy cyclist]

I'm not too sure ,but i think the OP is saying his tyres are the original ones from 1977? If they are then surely the rubber is knackered, and that's the problem.

 

[Smurfy]

Clincher tyre on non clincher rim?

 

[deptfordmarmoset]

Clincher tyre on non clincher rim?

If it's a 1977 Galaxy, I'd be surprised if it was a non clincher rim. An overtired tyre seems far more likely to me. (I've been very impressed with Marathon Supremes on my tourer. Pricy though.)

 

[earlestownflya]

clincher rim or not ,if the rims are 1977..i very much doubt they were designed to take a tyre with a rating 85psi...

 

[deptfordmarmoset]

clincher rim or not ,if the rims are 1977..i very much doubt they were designed to take a tyre with a rating 85psi...

True enough but rims don't shrink, beading can stretch. (Just to hold to my tired tyre theory....)

 

[earlestownflya]

very possibly could be tired tyres,new tyres would be my 1st port of call too

 

[Smurfy]

beading can stretch

I'd say yes for foldable tyres (kevlar beads), and no for non-foldable tyres (steel bead).

Have you ever tried to cut a non-foldable tyre? The bead is like piano wire. It is immensely hard and strong.

 

[earlestownflya]

and it's a tw@t to get off the rim