Offset and backspacing
Convert either way for any wheel width, including the half-inch rim-flange allowance real wheels have.
Offset & backspacing
Convert wheel offset and backspacing for a Tacoma or midsize pickup.
Enter wheel width with an offset or backspacing to convert between them and see how far the tire moves in or out on your Tacoma or other midsize pickup.
Summary: This calculator converts wheel offset in millimeters to backspacing in inches, and back, for any wheel width, and shows how far a new offset moves the tire in or out on a Tacoma or other midsize pickup.
Updated
What is the stock wheel offset on a Tacoma?
This table lists the approximate factory wheel offset for each Toyota Tacoma generation and trim, converted to backspacing with the same formula as the calculator below. The TRD Pro wheels sit lower than other trims in both generations, and 4th-gen base wheels sit unusually high, tucking the tire deep. Values are approximate and vary by model year and wheel option, so confirm the offset stamped on your wheel.
| Generation and trim | Stock wheel | Offset | Backspacing |
|---|---|---|---|
| 3rd gen (2016-2023) SR / SR5 | 16x7 | +25 mm | 4.98 in |
| 3rd gen (2016-2023) TRD Off-Road | 16x7 | +13 to +25 mm | 4.51 to 4.98 in |
| 3rd gen (2016-2023) TRD Sport / Limited | 17-18x7.5 | +30 mm | 5.43 in |
| 3rd gen (2016-2023) TRD Pro | 16x7.5 | +10 to +13 mm | 4.64 to 4.76 in |
| 4th gen (2024-2026) SR / SR5 / TRD Off-Road | 17-18x7.5 | +55 to +60 mm | 6.42 to 6.61 in |
| 4th gen (2024-2026) TRD Pro / Trailhunter | 18x8.5 | +20 to +25 mm | 5.54 to 5.73 in |
What backspacing does each wheel width and offset give a Tacoma?
Backspacing depends only on wheel width and offset, not on wheel diameter or generation, so these rows apply to 3rd- and 4th-gen trucks alike.
| Wheel width (common sizes) | +30 mm | +12 mm | 0 mm | -12 mm | -25 mm |
|---|---|---|---|---|---|
| 7 in (16x7, 17x7) | 5.18 in | 4.47 in | 4.00 in | 3.53 in | 3.02 in |
| 7.5 in (16x7.5, 17x7.5, 18x7.5) | 5.43 in | 4.72 in | 4.25 in | 3.78 in | 3.27 in |
| 8 in (16x8, 18x8) | 5.68 in | 4.97 in | 4.50 in | 4.03 in | 3.52 in |
| 8.5 in (17x8.5, 18x8.5) | 5.93 in | 5.22 in | 4.75 in | 4.28 in | 3.77 in |
| 9 in (17x9) | 6.18 in | 5.47 in | 5.00 in | 4.53 in | 4.02 in |
How far does an aftermarket offset poke out?
Each cell is how far the offset change alone moves the wheel outward (or inward, if negative) versus that trim's factory wheel. The same offset pokes a 4th-gen base truck out much farther than a 3rd-gen truck, because its stock wheel starts so far inboard.
| Stock wheel (offset) | +30 mm | +12 mm | 0 mm | -12 mm | -25 mm |
|---|---|---|---|---|---|
| 3rd gen SR / SR5 (+25 mm) | -5 mm | +13 mm | +25 mm | +37 mm | +50 mm |
| 3rd gen TRD Off-Road (+13 to +25 mm) | -17 to -5 mm | +1 to +13 mm | +13 to +25 mm | +25 to +37 mm | +38 to +50 mm |
| 3rd gen TRD Sport / Limited (+30 mm) | 0 mm | +18 mm | +30 mm | +42 mm | +55 mm |
| 3rd gen TRD Pro (+10 to +13 mm) | -20 to -17 mm | -2 to +1 mm | +10 to +13 mm | +22 to +25 mm | +35 to +38 mm |
| 4th gen SR / SR5 / TRD Off-Road (+55 to +60 mm) | +25 to +30 mm | +43 to +48 mm | +55 to +60 mm | +67 to +72 mm | +80 to +85 mm |
| 4th gen TRD Pro / Trailhunter (+20 to +25 mm) | -10 to -5 mm | +8 to +13 mm | +20 to +25 mm | +32 to +37 mm | +45 to +50 mm |
How do I read these tables?
- Factory offsets are approximate OE values and vary by model year and wheel option. Confirm the offset stamped on your wheel before you buy tires, wheels, or spacers.
- Backspacing uses the calculator's formula: half the wheel width, plus a 0.5 in rim-flange allowance, plus offset divided by 25.4.
- Poke is the offset change alone, the same number the calculator shows. Positive means the wheel sits farther out than stock, and each 25.4 mm of lower offset moves it 1 in outward.
- A wheel wider than stock also moves its outer lip out by half the extra width: going from a 7.5 in stock wheel to an 8.5 in wheel adds about 12.7 mm (0.50 in) beyond the poke shown.
Why does lower offset or a wider wheel rub?
Offset sets where the tire sits in the wheel well. A lower offset or a wider wheel moves the tire's outer edge outward, so a given tire size reaches the fender liner, mud flaps, and pinch weld sooner at full steering lock and full suspension compression. A size that clears at stock offset can need mud-flap removal, liner trimming, or a cab-mount chop at 0 mm or negative offset, so test any new setup turned and compressed.
The Max Tire Size Calculator models offset in three settings: +30 mm counts as Stock / high offset; +12 mm and 0 mm count as Moderate (0 to +15); -12 mm and -25 mm count as Aggressive (negative) / spacers. See the Tacoma will-it-rub table for the largest size each generation clears.
How does this wheel offset calculator work?
It converts wheel offset in millimeters to backspacing in inches, or back, for any wheel width, then shows how far a new offset moves the wheel compared with your stock wheel.
- What you enter: Wheel width in inches, whether you are converting from offset or from backspacing, that offset or backspacing, and the stock offset to compare against (look yours up in the factory table above).
- What it shows: Backspacing (or offset), poke vs stock in millimeters and inches per wheel, the track-width change across the axle, and the Tacoma factory offsets by generation and trim.
- What makes it Tacoma-specific: Factory offsets for each 3rd- and 4th-gen trim are built in as comparison baselines, and the math is on the page: the formula, including the 0.5 in rim-flange allowance, so any result can be checked by hand.
How does a 17x8.5 at -12 mm compare with the 4th gen stock wheel?
- Stock: a 4th gen SR / SR5 / TRD Off-Road wheel is 7.5 in wide at +55 mm (the low end of its +55 to +60 mm range). Backspacing = 7.5 / 2 + 0.5 + 55 / 25.4 = 6.42 in.
- Aftermarket: a 17x8.5 at -12 mm. Backspacing = 8.5 / 2 + 0.5 + (-12) / 25.4 = 4.28 in.
- Poke vs stock: 55 - (-12) = +67 mm (+2.64 in) per wheel, or +134 mm (+5.28 in) of track width across the axle. Measured from the +60 mm end of the stock range, it is +72 mm.
- Width: the 17x8.5 is 1 in wider, half on each side, so its outer lip sits about 79.7 mm (3.14 in) farther out than stock, while the inner lip moves 2.14 in outward, away from the suspension.
Convert your own wheel with the Wheel Offset Calculator below. To see which tire size clears at your offset, use the Max Tire Size Calculator. Related: Tacoma wheel offset and backspacing chart · Wheel spacer calculator · Bolt pattern calculator.
What it does
What does this tool do?
Poke and tuck
See how many millimeters a lower or negative offset moves the tire outward versus stock.
Tacoma factory offsets
Stock offsets by generation and trim so you can compare an aftermarket wheel to what is on the truck.
Which related tools and guides should I use next?
Where do these numbers come from?
Backspacing is half the wheel width, plus a flange allowance, plus the offset converted to inches, so any offset converts by formula. Toyota's manual gives factory wheel widths but no offsets, which is why the factory offsets here are labeled as approximate and ours.
- Factory wheel offsets: Taco Tires data, approximate by generation and trim, not from a Toyota document (Toyota's manual lists wheel width, not offset)
- Toyota 2026 Tacoma Owner's Manual tire and wheel specs: factory wheel widths (not offsets)
- Tacoma4G owner compilation of real 4th gen wheel, tire, and offset setups (owner reports, not measurements)
Tacoma Offset and Backspacing Calculator for Midsize Pickups FAQ.
Backspacing equals half the wheel width plus a 0.5 inch rim-flange allowance plus the offset divided by 25.4. Enter your width and offset above to do it automatically.
3rd gen wheels run roughly +13 to +30 mm depending on trim (+25 mm on SR and SR5, +30 mm on TRD Sport and Limited), with the TRD Pro lower near +10 to +13 mm. 4th gen SR, SR5, and TRD Off-Road wheels are unusually high at about +55 to +60 mm, while TRD Pro and Trailhunter run about +20 to +25 mm.
Yes. Backspacing comes only from wheel width and offset, so a 17x8.5 at 0 mm has 4.75 in of backspacing on any truck. What differs between midsize pickups is the stock offset you compare against, which is why this calculator lists the Tacoma factory offsets by trim.
A lower or negative offset pushes the tire outward, which increases rubbing at the fender, liner, and front bumper, especially at full lock. Higher offset pulls the tire inboard toward the upper control arm.