Tire size chart - 2022 HD Crowdsourced VIN/Order Tracking

[ACEd]

I believe a 295-70 is a 35” tire. I don’t remember where, but i watched a Utube where it was proved a 35” tall will fit on a stock suspension.

In response to diameter question, here are OE Tire specs and the available Cooper Discoverer AT3XLT specs for comparison. As you might notiice there is some minor variation in OD for same size - this is not unusual. It is also worth noting these are at full tread depth. (note tread depth in 32nds of an inch) The dimensions below are typical for highway and moderate AT tires. MT and Extreme Off Road Tires may have slightly deeper tread and possibly slightly larger diameters when new. If you have a specific tire in question, generally you can go to Manufacturer's website and fine data for a specific tire.

		Load Range	Sidewall	Allow Rim Widths, in	Meas Rim Width, in	Section Width, in	Overall Diameter, in	Tire (Tread?) Width	Tire Weight, Lb	Max Load Rating, Lb	Tread Depth, 32nds
OE Firestone Transforce HT
LT275/70 R18	125/122S	E	Black	7-8.5	8	11.0	33.10	8.6	49	3640	15.0
OE Firestone Transforce AT
LT285/60R20	125/122R	E	OWL	8-10	9	11.5	33.40	9.0	56	3640	16.0
Cooper Discoverer AT3/XLT Size
LT285/75R18	129\126S	E	BLK	7.5-9.5	8	11.5	34.84	8.9	60	4080	17
LT265/70R18	124\121S	E	RWL	7-9	8	10.7	32.64	8.62	53	3525	16.5
LT275/70R18	125\122S	E	RWL	7-8.5	8	11.1	33.23	8.9	57	3640	16
LT295/70R18	129\126S	E	BLK	7.5-10	8.5	12	34.25	9.41	61	4080	17
LT285/65R18	125\122S	E	RWL	8-10	8.5	11.6	32.56	9.41	57	3640	16
LT305/65R18	124\121S	E	BLK	8.5-11	9	12.2	33.58	10	62	3525	16.5
LT325/65R18	127\124R	E	RWL	9-12	9.5	13	34.61	10.59	68	3860	16.5
LT325/60R18	124\121R	E	BLK	9-12	9.5	13	33.35	10.63	63	3525	16.5
35X12.50R18LT	123R	E	BLK	8.5-11	10	12.5	34.96	9.88	66	3415	16.5
LT285/60R20	125\122S	E	BLK	8-10	8.5	11.3	33.7	9.69	60	3640	16

 

[Scubaz66]

In response to diameter question, here are OE Tire specs and the available Cooper Discoverer AT3XLT specs for comparison. As you might notiice there is some minor variation in OD for same size - this is not unusual. It is also worth noting these are at full tread depth. (note tread depth in 32nds of an inch) The dimensions below are typical for highway and moderate AT tires. MT and Extreme Off Road Tires may have slightly deeper tread and possibly slightly larger diameters when new. If you have a specific tire in question, generally you can go to Manufacturer's website and fine data for a specific tire.

		Load Range	Sidewall	Allow Rim Widths, in	Meas Rim Width, in	Section Width, in	Overall Diameter, in	Tire (Tread?) Width	Tire Weight, Lb	Max Load Rating, Lb	Tread Depth, 32nds
OE Firestone Transforce HT
LT275/70 R18	125/122S	E	Black	7-8.5	8	11.0	33.10	8.6	49	3640	15.0
OE Firestone Transforce AT
LT285/60R20	125/122R	E	OWL	8-10	9	11.5	33.40	9.0	56	3640	16.0
Cooper Discoverer AT3/XLT Size
LT285/75R18	129\126S	E	BLK	7.5-9.5	8	11.5	34.84	8.9	60	4080	17
LT265/70R18	124\121S	E	RWL	7-9	8	10.7	32.64	8.62	53	3525	16.5
LT275/70R18	125\122S	E	RWL	7-8.5	8	11.1	33.23	8.9	57	3640	16
LT295/70R18	129\126S	E	BLK	7.5-10	8.5	12	34.25	9.41	61	4080	17
LT285/65R18	125\122S	E	RWL	8-10	8.5	11.6	32.56	9.41	57	3640	16
LT305/65R18	124\121S	E	BLK	8.5-11	9	12.2	33.58	10	62	3525	16.5
LT325/65R18	127\124R	E	RWL	9-12	9.5	13	34.61	10.59	68	3860	16.5
LT325/60R18	124\121R	E	BLK	9-12	9.5	13	33.35	10.63	63	3525	16.5
35X12.50R18LT	123R	E	BLK	8.5-11	10	12.5	34.96	9.88	66	3415	16.5
LT285/60R20	125\122S	E	BLK	8-10	8.5	11.3	33.7	9.69	60	3640	16

Thanks! Lots of great information on Coopers. Very Helpful!

 

[ACEd]

Thanks! Lots of great information on Coopers. Very Helpful!

Dimensions are more or less typical for Highway and moderate AT tires regardless of brand. I am NOT advocating Coopers per se - but there has been some interest in them so might as well use their data

 

[ACEd]

Can you tell me how tall they are mounted ? Thanks

Dimensions in table should be inflated on specified rim width - uninflated dimensions would make no sense. LT295/70R18 34.25" OD and 12 inch section width on 8.5 inch rim. (Note for every inch change in wheel width, section width will change by roughly 1/2 inch, and overall diameter of a steel belted radial may change a small, but probably undetectable amount.)

In my mind, the vendor tables should be best info as to inflated OD. So I would say 34.25 or roughly an inch larger diameter than OE - or half that on radius which is the dimension affecting clearance. Note also if you change wheel width and especially offset there may be other rub issues just as serious.

		Load Range	Sidewall	Allow Rim Widths, in	Meas Rim Width, in	Section Width, in	Overall Diameter, in	Tire (Tread?) Width	Tire Weight, Lb	Max Load Rating, Lb	Tread Depth, 32nds
OE Firestone Transforce HT
LT275/70 R18	125S	E	Black	7-8.5	8	11.0	33.10	8.6	49	3640	15.0
OE Firestone Transforce AT
LT285/60R20	125/122R	E	OWL	8-10	9	11.5	33.40	9.0	56	3640	16.0
Cooper Discoverer AT3/XLT Size
LT285/75R18	129\126S	E	BLK	7.5-9.5	8	11.5	34.84	8.9	60	4080	17
LT265/70R18	124\121S	E	RWL	7-9	8	10.7	32.64	8.62	53	3525	16.5
LT275/70R18	125\122S	E	RWL	7-8.5	8	11.1	33.23	8.9	57	3640	16
LT295/70R18	129\126S	E	BLK	7.5-10	8.5	12	34.25	9.41	61	4080	17

 

[ACEd]

Thanks for the reply. My OEM firestone transforce at, 275/70/18 are 33.2" on the chart but measure 32.5" on truck with 70 psi.

Not sure how you are measuring on truck. As you probably know, the tire will squat a bit under load. There is another dimension called the Static Loaded Radius that used to be a commonly tabulated number but I have not seen for a while. It is the measurement from center of wheel to ground as mounted on a vehicle under a given load at a given pressure. I found some 10 year old data and tyipcally the SLR is about an inch less than 1/2 the diameter. So measuring from ground to top of tire will be off about an inch from true diameter.
Measuring left to right is possible, but getting measuring device exactly perpendicular to face of tire AND getting a true diameter dimension thru centerline of hub is a challenge. There is a special tool for this measurement which is again done off the vehicle.
Best option is to measure circumference of mounted tire off vehicle and divide by 3.14 as it is next to impossible to directly measure diameter accurately. Even there, you have to keep tape in center of tread.

 

[OuterUB]

In response to diameter question, here are OE Tire specs and the available Cooper Discoverer AT3XLT specs for comparison. As you might notiice there is some minor variation in OD for same size - this is not unusual. It is also worth noting these are at full tread depth. (note tread depth in 32nds of an inch) The dimensions below are typical for highway and moderate AT tires. MT and Extreme Off Road Tires may have slightly deeper tread and possibly slightly larger diameters when new. If you have a specific tire in question, generally you can go to Manufacturer's website and fine data for a specific tire.

		Load Range	Sidewall	Allow Rim Widths, in	Meas Rim Width, in	Section Width, in	Overall Diameter, in	Tire (Tread?) Width	Tire Weight, Lb	Max Load Rating, Lb	Tread Depth, 32nds
OE Firestone Transforce HT
LT275/70 R18	125/122S	E	Black	7-8.5	8	11.0	33.10	8.6	49	3640	15.0
OE Firestone Transforce AT
LT285/60R20	125/122R	E	OWL	8-10	9	11.5	33.40	9.0	56	3640	16.0
Cooper Discoverer AT3/XLT Size
LT285/75R18	129\126S	E	BLK	7.5-9.5	8	11.5	34.84	8.9	60	4080	17
LT265/70R18	124\121S	E	RWL	7-9	8	10.7	32.64	8.62	53	3525	16.5
LT275/70R18	125\122S	E	RWL	7-8.5	8	11.1	33.23	8.9	57	3640	16
LT295/70R18	129\126S	E	BLK	7.5-10	8.5	12	34.25	9.41	61	4080	17
LT285/65R18	125\122S	E	RWL	8-10	8.5	11.6	32.56	9.41	57	3640	16
LT305/65R18	124\121S	E	BLK	8.5-11	9	12.2	33.58	10	62	3525	16.5
LT325/65R18	127\124R	E	RWL	9-12	9.5	13	34.61	10.59	68	3860	16.5
LT325/60R18	124\121R	E	BLK	9-12	9.5	13	33.35	10.63	63	3525	16.5
35X12.50R18LT	123R	E	BLK	8.5-11	10	12.5	34.96	9.88	66	3415	16.5
LT285/60R20	125\122S	E	BLK	8-10	8.5	11.3	33.7	9.69	60	3640	16

Any chance we could add 35X12.5R20 LT to the list ?

 

[Lary0071]

I believe a 295-70 is a 35” tire. I don’t remember where, but i watched a Utube where it was proved a 35” tall will fit on a stock suspension.

295/70-18
295mm wide.
25.4mm per inch.
11.61" wide.

70 is the aspect ratio.... or the percent of the 295mm width that is the sidewall height. We already did the math on the 295÷25.4=11.61, so now we just take that 11.61×0.70 = 8.13"

So now we know that from bead to tread surface it is 8.13", and we know that this is doubled because we look at a tire on the car and see tread on the road to the bottom of the wheel, then we see again top of the wheel to the top of the tread surface.

So 8.13×2= 16.26" and we add the wheel diameter that is 18" in this case, 34.25"

So it's a 34.25"-11.6" tire before the weight of the vehicle is applied and the bottom of the tire flattens out due to bearing load.

2022 Patriot Blue 3500 Dually Limited Longhorn 6.7L with 4.11 gears.

 

[ACEd]

295/70-18
295mm wide.
25.4mm per inch.
11.61" wide.

70 is the aspect ratio.... or the percent of the 295mm width that is the sidewall height. We already did the math on the 295÷25.4=11.61, so now we just take that 11.61×0.70 = 8.13"

So now we know that from bead to tread surface it is 8.13", and we know that this is doubled because we look at a tire on the car and see tread on the road to the bottom of the wheel, then we see again top of the wheel to the top of the tread surface.

So 8.13×2= 16.26" and we add the wheel diameter that is 18" in this case, 34.25"

So it's a 34.25"-11.6" tire before the weight of the vehicle is applied and the bottom of the tire flattens out due to bearing load.

2022 Patriot Blue 3500 Dually Limited Longhorn 6.7L with 4.11 gears.

Exactly - but actual tires may not precisely match sidewall dimensions - and actual section width will vary with wheel width - about 1/2 inch change in section width for every 1 inch wheel width - and lastly, dimensions of actual tires may vary by manufacturer and tire model.

In the case of the Cooper Discoverer AT3XLT LT295/70R18, manufacturer data says 34.25 OD (exactly per your calculation) but with a 12 inch section width on an 8.5 inch rim (acceptable rims 7.5-10 in) and tread width of 9.41 in (a dimension that cant be calculated by sidewall dimensions). Wider treads of Extreme Off Road tires and Wheel Offsets may also affect clearance at steering lock.

And as you correctly noted the tire will squat when mounted on ground with weight of truck, amount will depend on load, but typically on this size truck tire an inch or so.

And finally, as I noted somewhere else, its the radius, not the diameter that affects clearance - going from a 33.2 inch tire to a 34.25 inch tire is only 1/2 inch difference on clearance.

 

[Brutal_HO]

FYI, using light colored text is difficult to read for anyone using the Light mode theme/background.

 

[Lary0071]

And offset often has more to do with rubbing than folks want to admit. As the wheel is pushed out, the swing arc or scrub radius is increased. This means that while turning the steering wheel, the tire doesn't sit and rotate in place, instead the tire is swinging a radial arc out past the ball joint center line. If you have a wheel centered on the lower ball joint, you would rotate the steering wheel and the tire would scrub radially on the center of the contract patch and not move forward or backwards.

Wheel spacers and manufactured offset backspace cause the increased scrub radius that causes added tire wear and clearance issues as well as increased steering effort at very low speeds. It also lowers the service life of unit bearings, steering joints and ball joints due to added stress.

2022 Patriot Blue 3500 Dually Limited Longhorn 6.7L with 4.11 gears.

 

[ACEd]

Any chance we could add 35X12.5R20 LT to the list ?

I thought I posted this before - but now cant find that post - so here it is
Discoverer AT3-XLT Tire Specification - NOTE LOAD CAPACITY OF 35x12.5R20 IS LOWER THAN OE

Tire Size	Service Description	Load Range	Sidewall	Approved Rim Width	Measured Rim Width	Section Width	Overall Diameter	Tire Width	Tire Weight	Max Load	Tread Depth
LT275/65 R20	126\123S	E	RWL	7.5 - 9.5	8	11.1	34.21	8.9	61	3750	16
LT285/65 R20	127\124S	E	RWL	8 - 10	8.5	11.5	34.57	9.69	62	3860	16
LT265/60 R20	121\118R	E	BLK	7.5 - 9.5	8	10.7	32.52	8.78	57	3195	16
LT275/60 R20	123\120S	E	BLK	7.5 - 9.5	8	11	32.99	8.9	57	3415	16
LT285/60 R20	125\122S	E	BLK	8 - 10	8.5	11.3	33.7	9.69	60	3640	16
LT295/60 R20	126\123S	E	BLK	8 - 10	8.5	11.5	34.13	9.72	61	3750	16.5
LT325/60 R20	126\123R	E	RWL	9 - 12	9.5	13	35.35	10.59	70	3750	16.5
LT275/55 R20	120\117S	E	BLK	7.5 - 9.5	8.5	11.2	31.89	8.9	55	3085	16
LT285/55 R20	122\119R	E	BLK	8 - 10	9	11.7	32.36	9.69	59	3305	16
LT305/55 R20	121\118S	E	BLK	8.5 - 11	9.5	12.2	33.35	10.31	62	3195	16
35X12.50 R20LT	121R	E	BLK	8.5 - 11	10	12.5	34.65	10	66	3195	16.5

 

[Brutal_HO]

You've been posting (off topic) tire charts in several other threads and they all got moved to this new thread here in Wheels/Tires.

 

[ACEd]

Just for the sake of equal representation - and OE Specs of the Firestones

Firestone Transforce HT

SIZE

Load Rating

UTQG

MAX. Load

Max. Inflation Pressure

Tread Depth

Tire Weight

Rim Width Range

Meas. Rim Width

Sect. Width

Tread Width

Overall Diam.

Revs. Per Mile

Country of Origin*

LT265/70R18

124/121R E

None

3,525 lbs.

80 psi

15/32"

46 lbs.

7-9"

8"

10.7"

8.5"

32.6"

CA

LT275/65R18

123/120S E

None

3,415 lbs.

80 psi

17/32"

51 lbs.

7.5-9"

8"

11"

NA

32.1"

651​

US

LT275/70R18

125/122S E Blk

None

3,640 lbs.

80 psi

15/32"

49 lbs.

7-8.5"

8"

11"

8.6"

33.1"

CA,US

LT275/70R18

125/122R E OWL

None

3,640 lbs.

80 psi

16/32"

50 lbs.

7-8.5"

8"

11"

8.9"

33.2"

627​

CA

Firestone Transforce AT

SIZE

Load Rating

UTQG

MAX. LOAD

Max. Inflation Pressure

Tread Depth

Tire Weight

Rim Width Range

Meas. Rim Width

Sect. Width

Tread Width

Overall Diam.

Revs. Per Mile

Country of Origin*

LT275/65R18

123/120S E

None

3,415 lbs.

80 psi

17/32"

52 lbs.

7.5-9"

8"

10.9"

8.3"

32.1"

651

US

LT275/70R18

125/122R E

None

3,640 lbs.

80 psi

18/32"

51 lbs.

7-8.5"

8"

11"

8.9"

33.2"

627

CA

LT275/70R18

125/122S E

None

3,640 lbs.

80 psi

15/32"

50 lbs.

7-8.5"

8"

11"

8.9"

33.2"

627

CA

LT285/60R20

125/122R E

None

3,640 lbs.

80 psi

16/32"

56 lbs.

8-10"

8.5"

11.5"

9.1"

33.4"

US

 

[ACEd]

You've been posting (off topic) tire charts in several other threads and they all got moved to this new thread here in Wheels/Tires.

Agree - was trying to reply in thread - this is good - Thanks

 

[ACEd]

Finally got to pick the truck up today. So happy and pleased with the whole experience.

You may have meant to post this in regular thread - this is now a Tire subthread - Best, Ed

 

[Thompsre08]

You may have meant to post this in regular thread - this is now a Tire subthread - Best, Ed

Whoops you are right. Haven’t been on for a week or so haha and missed so much apparently lol. I’ll post wheels and tires on Tuesday then haha. Just building suspense. FYI @Brutal_HO could you move my post above to the regular vin tracking thread?