Special tyres required?

[whiskers]

Have I missed something?

A second tube has blown because the tyre has bulged and come off the rim.
I assumed it was the original old tyres on the bike that had perished, but it has a new set, and new tubes and it's burst again.
Everything looked seated and fine at about 60psi, at 100psi I left it and it burst.

 

[Midlife]

Are there "hooks" on the inside lip of the rim?

https://static1.squarespace.com/static/ ... improfiles

 

[cce]

what rims are they? "hookless" rims (which are back in vogue for mountain bikes....) are meant to run lower pressure

 

[whiskers]

No, the rims are completely smooth. They're weinmann rims on a raleigh record sprint.
No hooks at all.
So try again at a lower pressure!?
The old tyres that came off didn't seem special, but I didn't take a great deal of notice

 

[cce]

yup, I've been poking around the internet and "about 60 psi" is the best I can find for a limit for road tyres

the hooks came about to stop the problem you've been experiencing at higher pressures

 

[whiskers]

Thankyou very much.
At about 60psi I inspected them and they seemed ok.
I'll try that and see!

 

[Big Block]

are you using wire beaded tyres?
and what width are the tyres?

 

[Martin Rattler]

Re:

I have a couple of bikes with Weinmann unhooked rims and have experienced similar problems when inflated to higher pressures. However, in my experience these seem to work fine running at about 60psi.