So the new Freightliner Cascadia with an18000 lb front axle has 315 80R22.5 tires on it. This tire is spec'd at 9090 lbs per tire at 130 psi.
When I ordered my 2007 Century with a 16000 lb front axle the 315 were the tires that came from the factory.
After the conversion and I scaled at 17500lbs I bumped the pressure to 130 (for the load capacity) and talk about a rough ride.
Then I upgraded my Freightliner from 16000 to 18000lb capacity. I bought new Alcoa 10.5 rims and put 365 70R22.5 Michelin XZA. These are rated at 10500 lbs and to carry 18000 I only carry 100 psi, which makes for a way smoother ride than the 315's I took off.
Not sure how Freightliner calculates tire capacity today but it does seem different than the way they used to.
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