18 inch tyre pressures

[random]

If anyone does feel like having a read of a report into tyres;

http://www.maic.qld.gov.au/forms-publications-stats/pdfs/tyre-pressure-report-final.pdf

There's some interesting bits and pieces in there if peope can be bothered.

For those interested, I had a scan, a couple of interesting quotes from the report above on some of the points of discussion here

"In summary, correct tyre pressure will improve a vehicles’ fuel economy. Fuel efficiency is reduced by one percent for every 20 kPa of under-inflation."

"If a tyre remains under-inflated by 10 kPa (below recommended) over its lifetime, the tread wear would increase by 2.6% - equivalent to about 2,000 km reduced travel."

About safety. The report said in a number of places that the rapid uptake of ESC had compensated for many possible safety issues with under inflated tyres.

Good link, thanks.

[RosscoMK3]

No problems.

There were some pretty interesting bits about the Tyre pressure warning system. Namely, just how far out the pressure has to be before they will light up.
Quote:
There is no universal definition of what constitutes an "under-inflated tyre".
The US Federal Motor Vehicle Safety Standard 138 requires a warning if tyres
are under-inflated by more than 25%. Based on this FMVSS requirement, we
regard a severely under-inflated tyres as 50 kilopascals (kPa) or more below
the recommended pressure. For reference, 1 psi = 6.9kPa so this equates to
7.2psi. The US FMSS Standard is described in more detail in the following
section.
We regard moderate under-inflation as in the range 20-49kPa under the
recommended pressure. End quote.

Did you notice the bit about the NRMA study on tyre pressures in Australia? When compared with colder climates the results were interesting.
I liked the bits about ESC too.