rik wrote:
Adam wrote:
If the tyre's off the rim, then a proper mushroom plug could be fitted from the inside. What's the difference between that and the fit of the valve, or in fact, the valve itself? Ever seen the tiny sealing surface in a Schrader valve?
Properly repaired, I'd have no problem with it either.
The difference (to my mind) is that the valve is part of the wheel, moreover it is designed from the outset to be part of the wheel, it is perfectly sealed to the wheel where it matters, it does not have to flex and does not alter its state as the tyre wears.
A plug on the other hand is not designed as part of the tyre and is a 'disturbance' to the carcass (the hole has to be reamed to be big enough to take the plug which is then forceably inserted

the cords are forced apart -if not actually cut- during this process), it is only sealed on the inside- so water can and does get into and rot the carcass despite the glue because it is also forced to flex with the tyre although it is of a different composition and structure and thickness...
This type of repair is common on car tyres (but officially never near the shoulders because of the flexing...) and I've seen tyres go badly out of shape due to certain cords in the carcass rotting / rusting through... the tension of the remaining intact cords then pull it out of shape. ....is it really worth the risk on a bike?

One thing that pisses me off "big time" is changing a damaged low mile tyre on a bike and it has happend to me many times in the past. On the other hand I like all my body parts in the order they came to me at birth. The paramedics call bikers "parts on wheels" for good reason as many transplant parts come from bikers.
Ok so use what you want but at about £150 for a good rear tyre it is a lot cheaper than a cheap wheel chair.
Oh and if you do have an off and the tyre is not right you might find the insurance company will not pay out. I have seen it before.
Some are more worried about matching leathers or the can on the bike. Just see how cool you look in them with one arm, no legs and a flash can up your arse.
For me I will pay up because I am not going to pay the Piper and have seen enough of my friends die on bikes because they have not looked after the basics.
You pays your money, etc.