Discussion
That does sound high, there isn't a definitive answer, from a very basic view it makes sense to load the tyre contact patch as evenly as possible, over-inflation causes excessive load towards the centre of the contact patch, under-inflation loads the outer areas. You can use chalk to draw a wide stripe across the tread, then drive the car. You can examine how the chalk wears off to determine how the load is spread across the contact patch. That only gives you a good (ideal) starting point, cornering and sidewall rigidity often require pressures to deviate from this ideal pressure. If it oversteers easily then reducing rear pressure can help, if it understeers then reduce front pressure.
I used 22F 24R on those wheel and tyre sizes. Which is standard pressures on all sizes really.
29 is too high on these cars unless your constantly at high speed over 100 mph.
Light car so as most tyres you buy are designed for heavier vehicles you need to have slightly lower pressures for normal usage to compensate the fact very little vehicle weight will be being transferred onto the tyre on our cars. Lowered and I presume stiffened suspension only makes this worse so reduce them to those pressures and see how it brakes handles bumps etc and grips in corners.
29 is too high on these cars unless your constantly at high speed over 100 mph.
Light car so as most tyres you buy are designed for heavier vehicles you need to have slightly lower pressures for normal usage to compensate the fact very little vehicle weight will be being transferred onto the tyre on our cars. Lowered and I presume stiffened suspension only makes this worse so reduce them to those pressures and see how it brakes handles bumps etc and grips in corners.
Sir Paolo said:
The book upper pressure limits for the standard wheel/tyre combination are 25f and 28r.
This is recommended for fully loaded high speed cruising, but the extra couple of PSI in the front may also benefit drivers of non-PAS cars.
The book 'cold' pressures were determined using Bridgestone SO2pp's. These tyres have an abnormally hard sidewall and are not transferable to tyres currently used by owners. It is common practice to add a couple of psi to 'book' pressures to compensate for the softer wall construction of modern tyresThis is recommended for fully loaded high speed cruising, but the extra couple of PSI in the front may also benefit drivers of non-PAS cars.
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