Bore, stroke, offset, tire diameter
divide the length value by 25.4
Same input, every length unit — tap a tile to set the right-hand unit.
Length is the unit you hit first on a wheel or engine parts page: ET in millimeters, backspacing in inches, bore in inches, piston compression height in millimeters. This converter keeps the constant honest — 25.4 mm per inch — and shows mm, cm, m, inches, and feet on one board.
Wheel offset is still a length. Convert ET 35 to 1.38 in if your calipers read inches, then check poke and backspacing on the wheel offset calculator. A tire’s 265 mm section width is not a fitment verdict either; that belongs on the tire size calculator.
For bore and stroke, convert the published number, then use the engine displacement calculator if you need liters or cubic inches from the set.
Offsets, strokes, and a couple of tape-measure checks.
| Job | You have | You need |
|---|---|---|
| Wheel offset ET 35 | 35 mm | 1.38 in |
| ET 45 | 45 mm | 1.77 in |
| SBC 350 stroke | 3.48 in | 88.4 mm |
| LS 4.000 in bore | 4.000 in | 101.6 mm |
| 1 inch | 1 in | 25.4 mm |
Wheel fitment needs offset, width, and backspacing together — use the wheel offset calculator. Tire diameter from a size code is the tire size calculator. Bolt circles are a pattern, not a single length.