Each cell is the axle ratio that restores stock feel: current ratio × new height ÷ stock height. Columns are the height of the tire you have now; rows are your current axle ratio.
To restore stock feel with 33 inch tires
| Current axle | from 28 in tires | from 29 in tires | from 30 in tires | from 31 in tires | from 32 in tires |
|---|---|---|---|---|---|
| 3.08 | 3.63 | 3.50 | 3.39 | 3.28 | 3.18 |
| 3.21 | 3.78 | 3.65 | 3.53 | 3.42 | 3.31 |
| 3.31 | 3.90 | 3.77 | 3.64 | 3.52 | 3.41 |
| 3.42 | 4.03 | 3.89 | 3.76 | 3.64 | 3.53 |
| 3.55 | 4.18 | 4.04 | 3.90 | 3.78 | 3.66 |
| 3.73 | 4.40 | 4.24 | 4.10 | 3.97 | 3.85 |
| 3.92 | 4.62 | 4.46 | 4.31 | 4.17 | 4.04 |
| 4.10 | 4.83 | 4.67 | 4.51 | 4.36 | 4.23 |
| 4.30 | 5.07 | 4.89 | 4.73 | 4.58 | 4.43 |
| 4.56 | 5.37 | 5.19 | 5.02 | 4.85 | 4.70 |
| 4.88 | 5.75 | 5.55 | 5.37 | 5.19 | 5.03 |
| 5.13 | 6.05 | 5.84 | 5.64 | 5.46 | 5.29 |
| 5.38 | 6.34 | 6.12 | 5.92 | 5.73 | 5.55 |
To restore stock feel with 35 inch tires
| Current axle | from 28 in tires | from 29 in tires | from 30 in tires | from 31 in tires | from 32 in tires | from 33 in tires |
|---|---|---|---|---|---|---|
| 3.08 | 3.85 | 3.72 | 3.59 | 3.48 | 3.37 | 3.27 |
| 3.21 | 4.01 | 3.87 | 3.74 | 3.62 | 3.51 | 3.40 |
| 3.31 | 4.14 | 3.99 | 3.86 | 3.74 | 3.62 | 3.51 |
| 3.42 | 4.28 | 4.13 | 3.99 | 3.86 | 3.74 | 3.63 |
| 3.55 | 4.44 | 4.28 | 4.14 | 4.01 | 3.88 | 3.77 |
| 3.73 | 4.66 | 4.50 | 4.35 | 4.21 | 4.08 | 3.96 |
| 3.92 | 4.90 | 4.73 | 4.57 | 4.43 | 4.29 | 4.16 |
| 4.10 | 5.12 | 4.95 | 4.78 | 4.63 | 4.48 | 4.35 |
| 4.30 | 5.38 | 5.19 | 5.02 | 4.85 | 4.70 | 4.56 |
| 4.56 | 5.70 | 5.50 | 5.32 | 5.15 | 4.99 | 4.84 |
| 4.88 | 6.10 | 5.89 | 5.69 | 5.51 | 5.34 | 5.18 |
| 5.13 | 6.41 | 6.19 | 5.98 | 5.79 | 5.61 | 5.44 |
| 5.38 | 6.72 | 6.49 | 6.28 | 6.07 | 5.88 | 5.71 |
To restore stock feel with 37 inch tires
| Current axle | from 28 in tires | from 29 in tires | from 30 in tires | from 31 in tires | from 32 in tires | from 33 in tires |
|---|---|---|---|---|---|---|
| 3.08 | 4.07 | 3.93 | 3.80 | 3.68 | 3.56 | 3.45 |
| 3.21 | 4.24 | 4.10 | 3.96 | 3.83 | 3.71 | 3.60 |
| 3.31 | 4.37 | 4.22 | 4.08 | 3.95 | 3.83 | 3.71 |
| 3.42 | 4.52 | 4.36 | 4.22 | 4.08 | 3.95 | 3.83 |
| 3.55 | 4.69 | 4.53 | 4.38 | 4.24 | 4.10 | 3.98 |
| 3.73 | 4.93 | 4.76 | 4.60 | 4.45 | 4.31 | 4.18 |
| 3.92 | 5.18 | 5.00 | 4.83 | 4.68 | 4.53 | 4.40 |
| 4.10 | 5.42 | 5.23 | 5.06 | 4.89 | 4.74 | 4.60 |
| 4.30 | 5.68 | 5.49 | 5.30 | 5.13 | 4.97 | 4.82 |
| 4.56 | 6.03 | 5.82 | 5.62 | 5.44 | 5.27 | 5.11 |
| 4.88 | 6.45 | 6.23 | 6.02 | 5.82 | 5.64 | 5.47 |
| 5.13 | 6.78 | 6.55 | 6.33 | 6.12 | 5.93 | 5.75 |
| 5.38 | 7.11 | 6.86 | 6.64 | 6.42 | 6.22 | 6.03 |
Example
A 3.73 axle with 31.6 in stock tires and new 35 in tires needs 4.13 to restore stock; the nearest common ratio is 4.10. Use the gear ratio calculator with your tires, your axle and your cruise speed, which also shows engine RPM. Ratios come from a list of common ones: check what is made for your axle.
Calculated from the size alone. Real tires vary a little by brand and model, and the loaded radius is a bit smaller. Confirm the wheel width range, clearance, load index and speed rating for your vehicle. See how to read a tire size, the load index chart and the speed rating chart.