rims bellowing out

[Old timer]

A member on another forum has a problem on an electric bike. Part of his rear rim is bellowing out. He has fitted Marathons a while ago and inflates to 75psi. I keep mine to 60psi which I find fine.

could it be that extra pressure, they are the later double skinned wheels.( the type where the spokes are down inside the inner section)

 

[TheDoctor]

If they're bellowing out, that sounds a bit dangerous to me. You don't want to be riding a rim when it breaks. New rim / wheel time IMHO

 

[Old timer]

If they're bellowing out, that sounds a bit dangerous to me. You don't want to be riding a rim when it breaks. New rim / wheel time IMHO

Do you think it`s because he has over inflated? he quotes that the tyre show max 75psi but I said to him that is the tyre max not the wheels.

 

[Tynan]

are the rims badly worn? they don't last forever

 

[PatrickPending]

as said before sounds dangerous, are the rims worn as suggested - are they significantly concave when the tyre is deflated? 75 psi isn't terribly high in the grnd scheme of things - the tyre would normally give way first anyway - if inflated above the recommended pressure...

 

[02GF74]

electric bike? probably some cheap chinese junk of crap with rims made from noodles.

75 psi is not that huge; road bike tyres can go to 120 psi and above but doing the old F=PA thing, the froice onthe rim will depend on the area of the rim.

if the rims are new, then as above, else they are worn to beyond their normal wear limits.,