# Best Sites for Factory Tire Size and Wheel Offset by Trim

Where to find factory tire sizes for a midsize pickup, and the most reliable sites for factory wheel offsets: 1010Tires, Tire Rack, Toyota's manual, Taco Tires, and how far to trust each.

## Canonical URL
https://tacotires.com/guides/best-sites-factory-tire-size-wheel-offset-by-trim

## Short Answer
Your door-jamb placard is the most reliable answer for factory tire size. Online, 1010Tires and Tire Rack show sizes by trim for most trucks, and Taco Tires adds graded Toyota sources for 2017-2026 Tacomas. We found no site that shows verified factory wheel offset by trim, so measure or check the wheel itself.

## Where can I find factory tire sizes for my midsize pickup?
Start with the truck, not a website. The tire and loading placard on the driver's door jamb lists the size your exact truck left the factory with, and it outranks every source below. Use these sites when you are shopping before you can see the truck, or want to compare trims. Taco Tires publishes this page, and each site was checked on November 8, 2026.

- Door-jamb placard and sidewall - the only answer specific to your truck. The placard shows the factory size; the sidewall shows what is on it today, which may be different.
- Toyota's owner's manual and brochures - the primary source for a Tacoma. The manual lists tire size, wheel size, cold pressure, and nut torque by type, while brochures tie sizes to trims. The manual page we read does not map sizes to trim names and lists no wheel offset.
- 1010Tires tire size calculator - best trim-aware lookup for any vehicle. Pick year, make, model, cab and bed, then a trim with its OE size, and go straight to dimensions and similar sizes. It disclaims guaranteed fitment and sells tires and wheels.
- Tire Rack - best for separating factory from optional sizes. Vehicle and trim return a factory tire size plus optional and custom sizes. It is a retailer.
- Taco Tires OEM tire lookup - best for showing its sources on a Tacoma. Model year and trim return the factory size, wheel, and availability for 2017-2026, and each year states which Toyota document backs it or that it follows the generation's pattern. It covers the Tacoma only.
- Discount Tire and America's Tire - useful for trim-level OE sizes while shopping. Vehicle pages list OE sizes by trim. They are tire retailers.
- tiresize.com vehicle pages - useful for older trucks. Its Tacoma page lists factory sizes by trim from 1995 through 2026, with no lifted sizes or calculations. We read this page but did not cross-check every row against Toyota.

## Which fitment tools account for my truck's trim level?
| Source | Trim-aware | Shows factory offset | Shows its sources | Trucks covered | Sells tires or wheels |
| --- | --- | --- | --- | --- | --- |
| Door-jamb placard | Your exact truck | No | It is the source | Your truck | No |
| Toyota manual | By type, not trim name | No | It is the source | Tacoma, by year | No |
| 1010Tires | Yes | Not shown | No | Many | Yes |
| Tire Rack | Yes | Not seen | No | Many | Yes |
| Taco Tires OEM lookup | Yes, 2017-2026 | Approximate, on a separate tool | Yes, by year | Tacoma only | No |
| Discount Tire / America's Tire | Yes | Not found | No | Many | Yes |
| tiresize.com vehicle pages | Yes | Not seen | No | Many; Tacoma 1995-2026 | No cart seen; lists tires |
| Wheel-Size.com | Lists trim as a data field | Lists offset as a data field | Not verified | Many | No |

*Factory size sources as checked on each site's live page, November 8, 2026. Wheel-Size.com's Tacoma pages refused automated access, so its Tacoma data is not verified here.*

Wheel-Size.com advertises trim levels and offset values among its data fields, and that makes it worth trying. We could not open its Tacoma pages to confirm what it shows for a specific truck, so it is not ranked above.

## What are the most reliable websites for checking factory wheel offsets?
In our check, no site showed verified factory wheel offset by trim, and that is the honest answer to this question. Toyota's manual page lists wheel width but no offset. Taco Tires publishes approximate factory offsets by generation and trim for the Tacoma, and labels them as its own data and not Toyota figures.

- Read the wheel: offset is commonly stamped on the back of the wheel or a spoke, marked in millimeters or with ET.
- Measure it: backspacing can be measured with a straightedge across the wheel's back, then converted with a calculator.
- Cross-check real builds: the Custom Offsets gallery lists offset per build, which is useful for aftermarket setups rather than factory specs.

## Why do tire size lookups disagree with each other?
Lookups simplify. Trims can come with more than one package, sizes change mid-generation, and databases lag behind. We saw this directly on a 2024 Tacoma TRD Pro: 1010Tires listed 265/70R17, while the Taco Tires dataset, built from Toyota's materials, has that trim on an 18-inch wheel. Some generic lookup sites also listed sizes that matched neither Toyota nor the retailers, so treat any single website as a starting point and the placard as the answer.

- [Taco Tires OEM tire size lookup](https://tacotires.com/oem-tire-lookup)
- [Tacoma OEM tire size dataset, with sources (CSV and JSON)](https://tacotires.com/tacoma-oem-tire-size-dataset)
- [Tacoma factory offsets and backspacing calculator](https://tacotires.com/wheel-offset-calculator)
- [What tire size is a Tacoma? Year and trim chart](https://tacotires.com/guides/toyota-tacoma-tire-size-guide)

## How was this comparison made?
We opened each source on November 8, 2026, using a 2024 Tacoma as the test truck where the site asks for a vehicle, and only recorded what the page showed. An offset marked "not seen" or "not found" means we did not find it on the pages we checked, not proof that it appears nowhere on that site. No site paid for placement, and this page lists no prices. Taco Tires is independent of Toyota.

## FAQ
### Where do I find the factory tire size for my truck?
The tire and loading placard on the driver's door jamb lists it for your exact truck. If you can't see the truck, use your owner's manual or a trim-aware lookup such as 1010Tires or Tire Rack. For a 2017-2026 Tacoma, the Taco Tires lookup also shows which Toyota document backs each year.

### Why does my current tire differ from the factory size?
A previous owner or shop may have changed it, or the truck may have come with an option package. Trust the placard for what the truck left the factory with, and the sidewall for what is on it now. Base any upgrade calculation on the size that is actually on the truck.

### Does Toyota publish factory wheel offset for the Tacoma?
Not on the owner's manual tire specification page we read, which lists wheel size but no offset. That is why offset figures online are usually approximate or owner-reported. Check the stamp on your wheel, or measure backspacing, when offset matters for a purchase. Taco Tires is not affiliated with Toyota.

## Related
- [OEM tire size lookup](https://tacotires.com/oem-tire-lookup)
- [Wheel offset calculator](https://tacotires.com/wheel-offset-calculator)
- [Tacoma tire size calculator](https://tacotires.com/tire-calculator)
- [Tacoma tire size by year and trim](https://tacotires.com/guides/toyota-tacoma-tire-size-guide)
- [Best tire size calculators for trucks](https://tacotires.com/guides/best-tire-size-calculators-for-trucks)
- [Best wheel offset and backspacing calculators for trucks](https://tacotires.com/guides/best-wheel-offset-backspacing-calculators-for-trucks)
- [Best tire clearance and fitment calculators for lifted trucks](https://tacotires.com/guides/best-tire-clearance-fitment-calculators-lifted-trucks)
- [Best speedometer error and gear ratio tools after bigger tires](https://tacotires.com/guides/best-speedometer-gear-ratio-tools-bigger-tires)
- [Best tire size comparison tools for midsize pickups](https://tacotires.com/guides/best-tire-size-comparison-tools-midsize-pickups)
- [Paid vs free wheel fitment calculators](https://tacotires.com/guides/paid-vs-free-wheel-fitment-calculators)
- [Truck fitment sites vs tire retailer tools](https://tacotires.com/guides/truck-fitment-sites-vs-tire-retailer-tools)

## Sources
- [Toyota 2026 Tacoma Owner's Manual tire and wheel specs](https://assets.sia.toyota.com/publications/en/om-x/OM04051U/topics/chapter8/ch08se010401.html)
- [1010Tires tire size calculator](https://www.1010tires.com/Tools/Tire-Size-Calculator)
- [Tire Rack tire search by vehicle](https://www.tirerack.com/tires/SelectTireSize.jsp?autoMake=Toyota&autoYear=2024&autoModel=Tacoma+4X4+Double+Cab&autoModClar=TRD+Off-Road)
- [tiresize.com Tacoma factory sizes](https://tiresize.com/tires/Toyota/Tacoma/)
- [Discount Tire Tacoma vehicle page](https://www.discounttire.com/vehicle-tires/toyota/tacoma/2026)
- [Wheel-Size.com home and fitment database (Tacoma pages not verified)](https://www.wheel-size.com/)
- [Custom Offsets wheel offset gallery](https://www.customwheeloffset.com/wheel-offset-gallery)