Allowable tire sizes

F8L · Oct 11, 2011

sidecar said: ↑

Its possible that there are a few colluding factors that make this more cloudy than it should be.

1/ The thing that disturbs me most is the possibility that someone moves from 15" equipment to 17" equipment, and doesnt allow for the new rubber to be broken in.

2/ The next thing would be poor choices in tyre diamters that effect speedometer and mileage readout.

3/ The quality of the test regime overall, and consistency of application.

one sure way of sorting this out is to get a co-pilot aboard with a good stop watch. Run some 1/4 or 1/8th mile times, say around 10 to even out reaction times, remove any flyers in the data. That removes any dependence on readout data

With the usual caveats on equipment selection, if it takes longer with bigger wheel equipment then we know with certainty a performance difference in mileage to account for.
Click to expand...

As usual, I totally agree with you. I didn't want to go into any specific test designs in this thread as it is well beyond the scope of what was being asked. However, if I could find a local PC member I would be happy to lend them my 15's that are broken in and RPM can be estimated.

I find it interesting that no serious testing has been done other than the UK test which found there was only a 1mpg difference. I trust that study as much as I trust Al-Qaeda!

Allowable tire sizes

F8L Protecting Habitat & AG Lands

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Allowable tire sizes

F8L Protecting Habitat & AG Lands