Mickey Thompson BAJ LGND EXP LT275/60R20 123/117Q 32.91 is a tire in LT275/60R20. The full sidewall spec is below, along with the overall diameter and revolutions per mile worked out for you, because those are the numbers that decide whether it clears and whether your speedometer still reads true.
What the sidewall is telling you
Read the size as three measurements. 275 is the section width in millimetres, about 10.83 inches across the widest part of the tire. 60 is the aspect ratio, meaning the sidewall is 60 percent of that width, which works out to 6.5 inches tall. 20 is the wheel diameter in inches, and that has to match your wheel exactly.
That gives an overall diameter of about 32.99 inches and roughly 611 revolutions per mile. Both matter. Overall diameter is what has to clear your fender and your suspension at full lock and under compression. Revolutions per mile is what your speedometer and odometer are calibrated against, so a change here shifts both readings unless the vehicle is recalibrated.
This size is designed to run on rims roughly 7.8 to 9.8 inches wide. Mounting it on a rim narrower than that range balloons the sidewall and rolls the tread under in corners. Mounting it on one wider stretches the sidewall flat and exposes the bead to impact damage.
Load index 123/117 means each tire is rated to carry about 3,417 lb at its rated pressure, so a full set supports roughly 13,668 lb. Speed rating Q certifies it to 99 mph sustained. Never fit a tire with a lower load index than the placard in your door jamb calls for. On a truck that tows or hauls, going under the placard rating is the single most common cause of a tire failing under load.
Specification
| Brand | Mickey Thompson |
|---|---|
| Tire Size | LT275/60R20 |
| Section Width | 275 mm (10.83 in) |
| Aspect Ratio | 60 |
| Sidewall Height | 6.5 in |
| Rim Diameter | 20in |
| Overall Diameter (calculated) | 32.99 in |
| Revolutions Per Mile (calculated) | 611 |
| Suggested Rim Width | 7.8 to 9.8 in |
| Load Index | 123/117 (3,417 lb) |
| Speed Rating | Q (99 mph) |
| Manufacturer Part Number | 90000120119 |
Fitment checklist
- Rim diameter has to match your wheel exactly. Everything else is a clearance question.
- Check the load index against the placard in your driver door jamb, not against what came off the vehicle.
- Compare the overall diameter above with what is on the vehicle now. More than about 3 percent difference and your speedometer reads noticeably off.
- Check clearance at full steering lock and under suspension compression, not just standing still.
- On all wheel drive and four wheel drive vehicles, replace all four together. Mismatched tread depth loads the differential.
What you may also need
- Mounting and balancing at a local shop, unless you are ordering a wheel and tire package, which ships mounted and balanced.
- New valve stems. Rubber stems perish and are replaced as a matter of course when a tire is changed.
- TPMS service kits if your vehicle has direct TPMS sensors, since the seals are single use.
- An alignment if the tires you are replacing wore unevenly. Fitting new tires to a bad alignment ruins them the same way.
Running them well
Set pressure to the vehicle placard, not to the maximum printed on the sidewall. The sidewall number is the tire limit, not a recommendation. Check pressures cold, before driving, because a warm tire reads several psi high.
Rotate every 5,000 to 8,000 miles. Aggressive tread patterns in particular wear the front shoulders quickly on a vehicle that is driven on road, and rotation is the difference between getting the rated tread life and getting two thirds of it.
Ordering, shipping and returns
Unless the title says set or package, the price shown is for a single item. Set the quantity in the cart for a full set. Orders ship from a United States warehouse, normally within 1 to 3 business days, and orders over $199 ship free. Tracking is emailed as soon as the shipment is created.
Unmounted and uninstalled parts in original packaging can be returned within 30 days. A wheel that has had a tire mounted on it, or a tire that has been fitted, cannot be returned, because neither is new any more. That is why we check the fitment data on every order against the vehicle you give us and contact you before shipping if something does not add up. If you are not certain, send us the year, make, model, trim and what is on it now and we will confirm it first.
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