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The Doctor's Archives

Inflation . Tire Application . Tire Facts . Tire Maintenance
Tire Performance . Tire Specs . Tire Wear . Unidirectional Treads

Dear Tire Doctor,

I currently have 295/75R22.5 G on the front of a 379 Pete.
It has a 14,600 lbs front axle and I'm looking to get the full rating out of
the front axle. Can you tell me what type of tire to go with?
view reply >>

Can an 11.00R20 tire fit on a rim that generally carries a 10.00-20 tire?
Both are rear wheels.
view reply >>

I own a 98 Freightliner FLD120 and my driver hauls garbage from one landfill to another. He does not drive long distances but nails, screws and other debris often puncture the tires.  Can you please recommend a few tires for a struggling owner operator of a single truck? view reply >>

I've purchased an antique 1953 Dodge 3/4 Ton 4x4 (Army) M - 43 Ambulance to restore. I need five new tires, 9.00 x 16. Please advise me about your 9.00 x 16 tires with a Military Tread, cost and availability. view reply >>


Dear Tire Doctor,

I currently have 295/75R22.5 G on the front of a 379 Pete. It has a 14,600 lbs front axle and I'm looking to get the full rating out of the front axle. Can you tell me what type of tire to go with?

I'm considering either an 11R22.5 or a 12R22.5. Your response is appreciated.

Thank you, Keith

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Dear Keith,

Thank you for contacting Bridgestone for assistance.

There are two tire applications that we recommend in order for you to realize the full gross axle weight on your steer axle. These recommendations are based on different possible usages of the vehicle.

If the truck is used primarily on paved road surfaces we would recommend:

Pattern:  R250F Load Rating H;
Size: 295/80R22.5; article number: 292-834
(Your Bridgestone dealer uses this
number to order the tire)

This is a 5-rib tire designed for local / regional trip length use on paved roads. It has a gross carrying capacity for a steer axle of 14,780 lb. @ 115 PSI. The tire has excellent cut/tear resistance for on road conditions, will be the quietest, smoothest riding, longest-wearing tire in this load capacity range. This tire is also the closest in dimensions to your OE tire to minimize differences in ride height of the front axle.

If the truck is used in an environment where it spends a great deal of time off-road we would recommend:

Pattern: M843 Load Rating H;
Size: 12R22.5; Article number: 287-881

This tire is a 4-rib/lug tire with a deep aggressive tread pattern for local on/off road use. It has a gross carrying capacity for a steer axle of 14,780 lb. @ 120 PSI. The tire has excellent cut/tear resistance for off road use. It is not intended for extended travel on paved roads. It will not wear as long as the R250 discussed above, and is subject to developing irregular wear if used too extensively on paved roads, however, it is excellent for traction in adverse conditions.

We would caution that off-road performance would have to be an overriding factor before choosing this tire.

This tire will also result in a greater difference in steer axle ride height than will the R250.

Best regards, Tire Doctor


Dear Tire Doctor,

Can an 11.00R20 tire fit on a rim that generally carries a 10.00-20 tire? Both are rear wheels. 

Thanks, Mike

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Dear Mike,

Thank you for the opportunity to be of assistance.

The 10.00-20 tire is designed for use on a 7.5" rim.

It is, however, allowable to use the tire on a 7.0", 7.5", 7.5M, or 8.0" rim.

The 11.00R20 tire is designed for use on an 8.0" rim.

It is, however, permissible to use the tire on a 7.5", 8.0", 8.50VM, or 8.5" rim.

Therefore, if your vehicle currently operating 10.00-20 tires is equipped with either 7.5" or 8.0" rims, it is possible that it would be acceptable to run 11.00R20.

However, you stated these are rear wheels, and we are assuming they are dual assemblies, in which case there is a second consideration.

The 10.00-20 tire requires a "minimum dual spacing" of 12.5".

The 11.00R20 tire requires a "minimum dual spacing" of 13.0".

Therefore, while it is possible that this may work, we would highly recommend that you have the installing tire dealer confirm that the above requirements are met.

You should also consider that the 11.00R20 tire will have a substantial difference in overall diameter (about 1.3") vs. the 10.00-20, which will affect vehicle clearance, actual final gear ratio, and speedometer/odometer accuracy.

Best regards, Tire Doctor


Dear Tire Doctor,

I own a 98 Freightliner FLD120 and my driver hauls garbage from one landfill to another. He does not drive long distances but nails, screws and other debris often puncture the tires.  Can you please recommend a few tires for a struggling owner operator of a single truck?

Thanks, Pascale

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Dear Pascale,

Unfortunately, this is a severe application that isn't very kind to tires, as you well know.  We manufacturer steer tires that have a tougher tread compound that might help.  We suggest you try the R250F.  This tire has the tougher compound and also has sidewall protectors to fight against sidewall scuffs and impacts.

If you wanted to go for a less expensive tire, you can look at our Firestone line where we would recommend the FS560 PLUS or the T559.  You can see these tires at www.FirestoneTruckTires.com or visit one of our Firestone dealers.

Hope this helps. 

Best regards, Tire Doctor


Dear Tire Doctor,

I've purchased an antique 1953 Dodge 3/4 Ton 4x4 (Army) M - 43 Ambulance to restore. I need five new tires, 9.00 x 16. Please advise me about your 9.00 x 16 tires with a Military Tread, cost and availability.

Respectfully requested, Frank

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Dear Frank,

We recommend you contact Coker Tire at www.cokertire.com.  Coker specializes in antique and hard-to-find tires.

Good Luck! Tire Doctor


The Doctor's Archives > Inflation . Tire Application . Tire Facts . Tire Maintenance
Tire Performance . Tire Specs . Tire Wear . Unidirectional Treads


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