Tires
I recently blew out a michelin outside rear dually tire on our Cambria 30J. I have 34k on the 5+ year old tires, no cracks and I keep 80 psi in the tires. I thought about replacing the blown tire with...
Forum Discussion
memtb wrote:
pniichols, I can see nothing wrong with your logic. When I originally got involved on this posting, I thought I was on the 5th wheel site( senility has it’s downfalls)....we have both a class c and a 5 th wheel. When I mentioned the 19.5’s, I was referring to the truck, thinking I was on 5th wheel site! . We haul very heavy loads with a SWD truck, another topic for another day. The 19.5’s allowed us to have “much” greater rear load rating.
When we put “new shoes” on our class c, we will do the same as you. A much taller, 16” tire, and recalibrate the speedometer. We’re running 4.30 gearing, taller tires will be a huge plus in many ways!
I'm curious ... how do you recalibrate the speedometer without spending money for a repair shop to do it via the OBD2 connection?
Our speedometer only reads about 1 MPH slower, so I have just left it as is.
By the way, of course when you go up in tire diameter on the 16 inch rims you usually wind up with tires that have higher per tire weight rating. Hence you get maybe a quadruple bonus using your stock 16 inch rims with taller tires: 1) More ground clearance, 2) a better ride, 3) slightly better gas mileage from making the overall drive ratio a bit taller, and 4) increased tire life due to less tire tread revolutions per mile.
My Ford E450 Class C came with the usual stock 225/75R16 LR E tires. I now run 215/85R16 LR E tires on it. I use the same tire pressures, use the stock 16 inch rims, get the same per tire load ratings, and gain about a 1.2 inch larger tire diameter for an increased 0.6 inches of ground clearance.
Another very subtle bonus is that the 215 tires are just a bit narrower - for better cooling air flow in between the sidewalls on rear dually sets during hot weather and for slightly more pounds per square inch downward pressure on all six tires that improves traction and steering via being able to better push through the slick layer to rougher material on wet or snowy road surfaces.
Larger diameter tires are always a better way to go. Even towables should, IMHO, come stock with larger diameter tires than what is commonly found on them.
