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20/7/2008 at 5:29pm
Location: None Entered Outfit: http: www.arcsystems.biz
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Quote: Originally posted by The 2 Tops on 19/7/2008
OK, Gary. Assuming that it can be accepted that the van must have the same ride/flexibility characteristics for stability, atc, then the difference in pressure for Matador Reinforced tyres must surely be due to differences in the flexibility of their tyre wall. However, I suppose I am taking a too simplistic view, and there is more to it than that. Bertie.
About as simplistic as I thought this tyre lark was but the more to delve into it the more complicated it gets?!
As for what your thinking then no, a certain size tyre must always remains the same dimensions outside, if it's of heavier, (thicker) construction then the inside dimensions reduce not the tyre get bigger outside.
I'm still learning on this but pressure is a consequence of the volume of air required inside the tyre to support the load, the actual volume of air required for a given load is a constant regardless of the size of tyre.
So the smaller the tyre or the thicker the carcase the more pressure required to force the air into the smaller space and visa versa.
Two simple examples are a giant earth mover tyre taking many tons of load at only 60psi
Now a push bike tyre carrying just you, this needs the same 60psi pressure or more!!
The difference is the available volume of space inside the tyre relative to the volume of air required to be squeezed in.
So you can see Matadors tyres would need to have thicker therefore stiffer side walls to require more pressure so your theory goes out the window!!
The actual reason in this case is possibly to do with 42psi for reinforced tyres being an 'industry standard' pressure rather than an 'absolute' maximum.
You can read more on why I say this under 'North American pressure and load markings'Here last two paragraphs
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