Load range is molded into the tire sidewall, usually near the size code, max load line, or cold inflation wording.
If you’re trying to spot the load range on a tire, start with the sidewall text. That ring of molded letters and numbers holds the tire’s working data: size, load index, speed rating, maximum load, and inflation details. On many light-truck and trailer tires, the load range shows up as a letter such as C, D, or E. Once you know where those clusters sit, the mark is much easier to find.
That small letter can save you from buying the wrong tire. Two tires may share the same size but carry different weight limits. One may suit a pickup that rarely tows. Another may fit a truck that hauls tools, cargo, or a trailer every week. So the job is not just finding the size. It’s reading the service markings around it.
Where To Find Load Range On A Tire? On The Sidewall
The load range is almost always on the tire sidewall. Stand next to the tire and read the molded text that wraps around the rubber. Most makers place it in one of three spots: right after the tire size, near the service description, or close to the maximum load and cold inflation pressure line.
On a light-truck tire, you may see a full string such as LT275/65R18 123/120S followed by Load Range E. On another tire, the wording may sit a little farther away from the size line, tucked near the load and pressure text. Either way, it is not buried in a code book. It is part of the sidewall script.
If the letters blend into the rubber, wipe the tire clean and use your phone light. Old dressing, brake dust, and road grime can make the marking harder to read than it should be.
What The Marking Usually Looks Like
Most shoppers are scanning for a plain letter code or a short load class mark. Common markings include:
- Load Range C on lighter-duty light-truck or trailer tires
- Load Range D on a higher carrying class in the same size family
- Load Range E on many pickup, van, and towing tires
- SL for standard load passenger tires
- XL for extra load passenger tires
The load range letter does not stand alone. It ties to the tire size and pressure rating. That is why one tire size can show up in more than one carrying class.
Finding The Load Range On A Tire Sidewall Without Guessing
Read the size line first. That long string of letters and numbers is your anchor. Then scan a few inches to either side for the rest of the service data. On many LT tires, the load range sits near the size or right after the service description. On passenger tires, you may not see a classic load range letter at all, and that is where many people get tripped up.
Michelin’s tire sidewall markings explainer shows how makers group size, load, and service data on the sidewall. Goodyear’s tire terms page defines load range as an alphabetic code tied to the weight a tire can carry at a stated inflation pressure.
That clears up the main mix-up: load range is a letter system, while load index is a number system. They both relate to carrying ability, but they are not the same mark.
| Sidewall Mark | Where You’ll See It | What It Means |
|---|---|---|
| LT | Start of the size code | Light-truck tire; often paired with load range letters |
| ST | Start of the size code | Trailer tire; many also show a load range letter |
| SL | Near the size or service data | Standard load passenger tire |
| XL | Near the size or service data | Extra load passenger tire |
| Load Range C | Near the size or max load wording | Lighter-duty carrying class in that tire type |
| Load Range D | Near the size or max load wording | Higher carrying class than C in the same size family |
| Load Range E | Near the size or max load wording | Common heavier-duty class on many LT tires |
| 121/118S | After the size code | Load index and speed rating, not the load range letter |
Marks Near The Load Range That People Mix Up
Once you find the load range, read the neighboring marks too. They tell you whether the tire fits the job you have in mind, and they stop the usual ordering mistakes.
Load Range Vs Load Index
A load range letter points to the tire’s load class for that size. A load index number maps to a weight value on a chart. If your tire reads 121/118S, those numbers are load indexes and the final letter is the speed rating. The load range, if the tire uses one, is a separate letter mark such as C, D, or E.
SL, XL, And LT
Many everyday passenger tires skip the old-style load range letter and use SL or XL instead. That means standard load or extra load. Light-truck tires usually start with LT in the size code and often carry the familiar C, D, or E load range lettering. Trailer tires often start with ST and may show a load range too.
A Simple Reading Order
- Find the tire size line first.
- Read the load index and speed rating that follow it.
- Scan nearby for Load Range, SL, or XL.
- Match those marks to your vehicle placard and the tire you’re replacing.
This order takes the guesswork out of the job. It also helps when a product page lists the same tire size in more than one load class.
When You May Not See A Load Range Letter
This is the part that catches a lot of drivers. Many passenger tires do not print a classic load range letter at all. You may see SL or XL, plus a load index and a maximum load line, and that is normal. The tire still has a carrying class. It is just shown in a different format.
Some tires also use old-school ply language in listings, which can muddy the water. Shops may mention “10-ply rated” when the tire sidewall shows Load Range E. That does not mean the tire has ten physical plies. It is shorthand carried over from older tire labeling.
If the sidewall is worn, cracked, or hard to read, do not guess. Read the label on the new tire, the seller’s spec page, or the placard on the driver’s door jamb. That placard gives the tire size and load setup chosen for the vehicle.
| If You See | Read It As | Next Step |
|---|---|---|
| P235/65R17 104H XL | Passenger tire with extra-load class | Match XL and confirm the load index |
| LT275/65R18 123/120S Load Range E | LT tire with E load class | Match size, load range, and placard specs |
| ST225/75R15 Load Range D | Trailer tire with D load class | Match it to the trailer tire rating on record |
| No letter, but SL shown | Standard-load passenger tire | Check the load index and factory fitment |
| Faded or unreadable sidewall | Marking cannot be trusted by eye | Use the seller spec sheet or the vehicle placard |
Common Mistakes When Reading Tire Load Range
The first mistake is chasing the size and stopping there. Size gets the tire onto the wheel, but it does not tell the whole story about carrying ability. The second mistake is treating load index and load range as the same thing. They work together, but they show up in different forms.
Another slip is swapping passenger, LT, and trailer tires as if the markings mean the same thing across the board. They do not. An XL passenger tire is not the same thing as an LT tire with Load Range E, even if the numbers feel close at first glance.
Then there is the visual trap. Raised black lettering can make one line easy to read and the service data hard to spot. Slow down, rotate the tire a bit, and read the smaller molded text. That is where the real answer sits.
A Simple Way To Confirm Before You Buy
If you’re checking a tire in person, start with the size code, then read every service mark next to it. If you’re shopping online, open the specs and match the same items in the same order. Do not stop after size alone.
- Match the tire size exactly unless you are changing size on purpose.
- Match the load class shown on the placard or the tire you trust.
- Check the load index when the tire uses SL or XL wording.
- Match the tire type too: passenger, LT, or trailer.
That four-step check takes only a minute, but it cuts out most buying errors. It is also the cleanest way to read listings that toss size, load index, and speed rating onto one crowded line.
So, where do you find load range on a tire? On the sidewall, right next to the other service markings that tell you what the tire can carry and how it should be used. Once you know that, the side of the tire reads less like a code and more like a label.
References & Sources
- Michelin.“How to Read Tire Markings and Sidewall Codes.”Shows where size, load, and service data sit on the tire sidewall.
- Goodyear.“Tire Definitions & Terms.”Explains load range as an alphabetic code tied to a tire’s load at a stated inflation pressure.