What The Size Code Means
245/70R17.5 breaks down as a 245 mm section width, a 70 percent aspect ratio, radial construction, and a 17.5 inch rim diameter. That last number is the one that has to match your wheel exactly. A 17.5 tire will not mount on a 19.5 or a 22.5 wheel, and no amount of bead lube changes that.
Load Range J on this size means an 18-ply rating. That is a heavier casing than the Load Range H tires often fitted to the same rim diameter, so check the load rating on the tire you are pulling off before you order. Under-rating a trailer axle position is how you end up with sidewall failures on a loaded run.
The FAR602 is an all-position pattern. It can run steer, drive, or trailer, which is why fleets stock a single size and rotate positions to even out wear. That flexibility does not override axle load limits or any position restriction printed on the sidewall, so read the tire before you fit it.
Why These Numbers Match
There are two identifiers in play here and they do different jobs. 245/70R17.5 is a size designation shared across every manufacturer that builds this tire size. Fortune FAR602 is a model designation that names the specific tread pattern and casing construction. Together they describe one tire, not a family of tires.
So when a listing shows 245/70R17.5 and Fortune FAR602 side by side, they are not two different products cross-referenced to each other. They are the size code and the model code for the same casing. Someone searching either one is looking for the same thing on the shelf.
This is different from a mechanical cross-reference, where two unrelated numbers describe interchangeable hard parts. With tires, the size code is the interchange. Any 245/70R17.5 in the correct load range will physically mount on the wheel. What changes between brands is tread pattern, compound, and casing ply rating.
Check Before You Order
Read the full sidewall on the tire coming off, not just the size. You want the size code, the load range letter, the load index, and the speed symbol. Match all four. Mixing load ranges across an axle changes the loaded rolling radius and puts uneven torque through the differential on drive positions.
Then check the wheel itself. Cracked rims, corroded bead seats, and bent flanges are common on 17.5 inch steel wheels that have run flat or been curbed. A new tire on a compromised rim will leak at the bead. Cross-referencing by size is a starting point; confirm against the number on the old tire and the wheel spec before you commit.
245/70R17.5 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 245/70R17.5. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Fortune | Fortune FAR602 |
Frequently asked questions
Can I run a 245/70R17.5 in a steer position?
The FAR602 is built as an all-position tire, which means the pattern is designed to work on steer, drive, or trailer axles. Always confirm there is no position restriction molded into the sidewall of the specific tire you receive. Also verify your front axle rating supports the load index on the tire before fitting.
What is the difference between Load Range H and Load Range J in this size?
J is one step above H and corresponds to an 18-ply rating on this tire. It carries more load at a higher inflation pressure. Do not substitute a lower load range for a J casing on an axle that was specified for it. Check the load index and pressure figures on the sidewall of the old tire and match them.
Will this tire fit my trailer without checking anything?
No. Cross-referencing by size gets you close, but you need to confirm the rim diameter is 17.5 inches, the load range matches, and there is adequate clearance in the wheel well and between duals. Verify against the number on the tire you are replacing or against the vehicle build data before ordering.
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Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
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