TRA Codes Explained: E-3, L-3, L-5 and G-2 for OTR Tires
TRA codes explained for buyers: what E-3, E-4, L-3, L-5, G-2 and C-1 mean on OTR tires and how to match the tread to your machine.
Here are the TRA codes explained in plain words. The code on the sidewall tells you what kind of work the tread was designed for. Matching it to your machine matters as much as the size.
The Letters
- E – earthmover: haul trucks, scrapers, articulated dumpers
- L – loader and dozer
- G – grader
- C – compactor
- IND – industrial and port equipment
The Numbers
The number shows tread type and depth. 1 is a rib tread, 2 is traction, 3 is rock, 4 is deep rock, and 5 is extra deep rock. A letter S means smooth, used underground or on very sharp rock.
Common Codes and Where They Work
E-3 and E-4
Rock treads for dump trucks. E-4 has a deeper tread for longer life on abrasive roads.
L-3 and L-5
L-3 is the everyday loader tread for quarries and aggregates. L-5 has very deep rubber for scrap yards, steel mills and blasted rock.
G-2
The standard traction tread for motor graders, with good grip on loose material.
L-2
A lighter traction tread for loaders working on soft soil or sand.
TRA Codes Explained for Ordering
When you request a price, give the code together with the size and rating. The Tire and Rim Association maintains these codes. You can browse our tires by code, for example L-3 tires, E-3 tires and G-2 tires.
If the old tire is worn smooth and you cannot read the code, send a photo of the machine and the work it does. We will suggest the right tread.
TRA codes explained: Frequently Asked Questions
Can I use an L-3 tire on a dump truck?
It is possible in some sizes, but not ideal. Loader treads are built for low speed and high torque, while E codes are designed for travel and heat. On a haul truck, an L tread may run too hot. Stick with the E code your machine maker recommends unless your dealer confirms otherwise.
What is the difference between L-4 and L-5?
L-4 is a deep rock tread, about one and a half times the depth of L-3. L-5 is extra deep, roughly two and a half times. L-5 suits scrap, slag and demolition. L-4 is a good middle ground for hard quarries where L-3 wears too fast.
Do industrial tires use the same codes?
Industrial and port tires often use IND codes or maker-specific markings. Solid tires usually skip the code and list the use instead, such as forklift or skid steer. When in doubt, send the machine type and size and we will match the right tread.
Is the TRA code the same as the ETRTO marking?
They are closely related. The TRA system is used mainly in North America, while ETRTO covers Europe. Most OTR tires carry markings that work with both. The codes describe tread type and depth in a similar way, so buyers worldwide can compare tires easily.
Next Steps on TRA codes explained
Put this guide to work on your next order. Write down the sizes and ratings from your sidewalls, decide on brand tiers, and ask for a quotation with freight to your port. Our team checks every request by hand and replies with a clear price and loading plan. Explore the catalogue or compare brands first if you like.
Contact OTR TIRE (THAILAND) CO., LTD. at info@orttirethai.shop or on WhatsApp +66 640 130 805.
