jspringator wrote:
I noticed on my last trip the MH handeled very well when the TPMS showed the hot pressure at 66-69 across the range of 6 tires. My pump was showing the pressure at 60psi when cold inflated, but the TPMS showed 55. Winnebago recomends 65, but the loading charts for the tires show a huge margin of safety at actual weights at the scale. I thnk the issue with mine is that it is a shorty at 27', and I surmise the pressure of 65 is for the entire Sightseer line. My gage, the tire pump and my TPMS all give different readings.
Actually the improvement in handling at these pressures was nothing short of remarkble. I felt noticably less fatigued. I don't remember the tire temperature, but the alarm didn't go off. I'll check that next trip.
Winnebago's recommendation (I'm assuming on the Federal tag on/near the driver's door) is NOT for the entire Sightseer line, but rather for your specific model, based on
it's maximum GVWR, which is 14,800. If your rig actually weighs less than that max, then it would make sense that it handles better at slightly lower pressures.
However, Michelin's tire pressure tables for the 225/70-19.5 tires that came stock on your chassis don't go below 65psi. So while I have always believed that tire pressures should be based on your actual weight, I also feel that you should never go below the lowest pressure listed in that tire manufacturer's table. If I was
significantly under the GAWRs, I might consider 60psi cold, but even that would make me a bit nervous.
The troubling part is that your gauge, pump, and TPMS are all giving you different information, so you really don't know what pressure you are running. Perhaps it would be worth going to a major tire shop and seeing what THEIR gauge says vs what yours says.
