Michelin Load & Inflation Tables

[davidbrady]

(05-22-2013 12:21)davidmbrady Wrote:  This crosses to Alcoa part number 88311 which has an outset of 6.66" which gives you a dual spacing of 13.32". Add to that the thickness of a nylon spacer and you may be very, very close to the 13.5 inches required.

I need to add a caveat to my calculation. Doubling the wheel's outset dimension only works if you're running the same wheel on the inner dual. This is obvious, but bears mentioning. Also, if you are running a steel inner wheel then it's probably a good assumption that it's outset matches the outer aluminum's outset but it should probably be checked. Add to this the fact that these coaches are old and you never know what a previous owner did in terms of wheel replacement. It's interesting that if you go out and buy a late model Prevost XLII you'll get steel inner dual wheels. Prevost only put aluminum on the outside. Cost cutting??? Or ride quality??? I'd venture a guess that steel wheels ride softer; remember the inner wheel does most the work.

(05-22-2013 13:21)pgchin Wrote:  5lbs does nothing for ride quality.

I'd argue over this Pete. Maybe it's coach specific, but on my LXi 5 psi makes a difference. If I can keep the hot tire below 105 psi, then the ride is remarkably smoother than if the hot tire is 110 psi. Luckily for me, my cold settings are such that my hot steer tires run at 105 psi - the typical heat increase from rolling resistance increases my steer pressures by 10 psi. Now, the sunny side on a hot Arizona afternoon will heat up more, in this case I slow down. I try to keep my tires running cool which I measure by noting pressure increases.