New tires put on

[luvrbus]

Hey Clifford how do the bus manufacturers arrive at thier recommended pressures? Are they according to the maximum allowed loading per the axle? Is there any consideration given toward ride quality or handling? Or purely by weight? I have always used the tire manufacturers recommendations according to weight on my bus and truck/trailers. (Anything heavy basically). Should I rethink my strategy? In your opinion is there an advantage to one method over the other? I'm genuinely interested in the pros and cons of the different methods. Inquiring minds want to know, lol.

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I have no idea how manufactures come up with tire pressure ,only tire I ever had cup was listening on a forum about air pressure so I weighed it and dropped the air pressure to 80 lbs from 105 psi (Eagle bus) 250 miles later I had cupping on 2 new tires never went that route again lol remember the Ford ordeal 

[thomasinnv]

I have no idea how manufactures come up with tire pressure ,only tire I ever had cup was listening on a forum about air pressure so I weighed it and dropped the air pressure to 80 lbs from 105 psi (Eagle bus) 250 miles later I had cupping on 2 new tires never went that route again lol remember the Ford ordeal 

Hmm, you do have a valid point. I may just rethink my strategy and bump them all up to 120. Wonder if that might help my "bouncing betty" on the front axle. I have a tire that is pretty bad out of ballance. Has the maximum amount of lead that the tire shop would put on it but was still out of ballance. Starts bouncing a little right around 60. 5 under or 5 over is not so bad. Really didn't want to have to replace the tire before its time they are only 4 years old, those fs400 are not cheap.

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[richard5933]

Hey Clifford how do the bus manufacturers arrive at thier recommended pressures? Are they according to the maximum allowed loading per the axle? Is there any consideration given toward ride quality or handling? Or purely by weight? I have always used the tire manufacturers recommendations according to weight on my bus and truck/trailers. (Anything heavy basically). Should I rethink my strategy? In your opinion is there an advantage to one method over the other? I'm genuinely interested in the pros and cons of the different methods. Inquiring minds want to know, lol.

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Not sure how they calculate the numbers, but there should be a chart with pressure at various weights.

We run Firestone FS400 at 95 psi. That's about 5 over the stated pressure for our heaviest corner. Tried it higher, but handling was jumpy.

I have read that the manufacturer does account for expansion in the heat at all the stated pressures.

[chessie4905]

Thomas, you could add a pint of antifreeze to the tire to help deal with that.

[windtrader]

Richard,
Look here. https://commercial.firestone.com/content/dam/bcs-sites/firestone/TBR/load-inflation-tables/mar2015/FS_TBR_load-inflation-tables_web_2014.pdf

[Jim Eh.]

Thomas, did the tire shop "index" the tire on the rim (rotate the mounting)?

[thomasinnv]

Thomas, did the tire shop "index" the tire on the rim (rotate the mounting)?

I'd have to look but my guess is no. Seems almost nobody does that anymore,  I see them little dots all over the place.

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[TomC]

My bus is 10,500lb front, 20,500lb rear. According to Michelin inflation tables for 11R-24.5, front should be 80, rear 85. I run 90 all around that is rated at 11,680lb front, 22,040lb rear for a safety factor. Bus rides very well. Don't over inflate-makes the bus ride like a fork lift and actually rolls the tire up giving less contact with the road. Good Luck, TomC