Decoding tyres

[Zephod]

On my tyres, it says
(front tyres)
Radial
Brand lightly here
1/32 max depth
Goodyear g159
Unisteel
271848 grwx 49B
10r 22.5 tubeless
138/186L
Load range F
Max load single 5205lbs at 100psi cold
Tread 4 ply steel cord
Regroovable
Sidewall 1 ply steel cord
Made in USA.

The back tire says
Goodyear unicircle g362 retread
11r22.5
G661 has
Rcnx4123rs
346298
Graham 039s
F3L
Dot mc3t e5bw 0210
Radial tubeless
Max load single 6175lbs at 105psi cold
Max load dual 5840lbs at 105psi cold

Plies tread 5 steel
Sidewall 1 steel
Load range g
E13 0011898 test infl 105 psi e13 0011901-s
Made in USA
S04158


On the makers plate
9.00 - 20F tires 20x7.0 rims rear 85psi
9.00 - 20F tires 20x7.0 rims front 95psi
Gawr 27,500
Gawr front 10000
Gawr rear 17500

I think I know what most of that means. I'm thinking I have the wrong tires on the back and possibly the front too but they seem to work. The ultimate goal will be to put new tyres in place of the retreads and to replace the g159s and raise the max speed to about 70 on the flat.

The tires pass a visual inspection and are st the correct pressure according to the makers plate. No cuts, nicks, bulges etc.

Can anybody with good knowledge of tyres explain any of that to me?

[GiddyInn]

I am not an expert, But I believe the dot number has the date of manufacture of the tire, the last 4 digits  0210, the second week of 2010. If your bus is like my schoolie, it came stock with 9r20 tires, That means it is a 20" diameter rim. That style was a split rim, needing to have a tube. 22.5 rims are one piece rim. but they fit on the same hubs. I don't know if that helps you any or not.

[Zephod]

No split rims here. All Dayton. I've seen Dayton hubs at work with a wide variety of metric and imperial sized tyres. I'm trying to find out what Carpenter or Interbational would ha e originally specified.


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[Dave5Cs]

Just what it says,
On the makers plate
9.00 - 20F tires 20x7.0 rims rear 85psi
9.00 - 20F tires 20x7.0 rims front 95psi
Gawr 27,500
Gawr front 10000
Gawr rear 17500

0210 are just out of safe useful date. 7 years IMHO

[eagle19952]

On my tyres, it says


The back tire says
Goodyear unicircle g362 retread

Dot mc3t e5bw 0210
SAFETY
Dot Code: MC3TE5BW0210   Age: 7 years, 2 months.
Warning: Expired
(Details)
Recall Status: No Recall Detected
MANUFACTURING
Made in:   UNITED STATES
Manufacturer:   GOODYEAR TIRE & RUBBER COMPANY
Location:   DANVILLE, VIRGINIA
STANDARD SIZES:
Light Truck :   38X15.50R20LT
M-Metric :   225/35R17

http://www.tiresafetygroup.com/

[Oonrahnjay]

No split rims here. All Dayton. I've seen Dayton hubs at work with a wide variety of metric and imperial sized tyres. I'm trying to find out what Carpenter or Interbational would ha e originally specified.

      I think you're not dealing with what was originally specified, you're dealing with what you have.  It is pretty obvious to me that someone has replaced your original 20s with 22.5 inch rims -- with tires to match, obviously.   Unless there's some restriction that means that the larger tires/rims don't fit or interfere with some important system or overload bearings and steering joints (which I don't expect but don't know for sure), that someone did you a favor.
      Yeah, your tires are old but that spec has plenty of carrying capacity for your bus and axle ratings.  Get new ones (or used ones with time left on the date code) and you're fine.
      Find a good weighbridge that will give you an axle-by-axle weight (full tanks, a realistic load of your own personal items on board etc.)   Even better, a weighbridge that will give you tire by tire weights but they're not as common and not really necessary.

[Zephod]

Replacing the tyres is on the agenda for some future point. I'd prefer 10s but 11s seem more common and add only 2mph to speed. Plenty room, imo for 11s at the back. Not so sure about the front.


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[luvrbus]

The 900x20 was a common tire on some school buses and are almost incidental in size as the 900x20, here they were a wheel with a lock ring and diffidently tubeless ,I have those on a fire truck also.The schools here changed to 11x22.5 because of the difference in availability and price fwiw