The short answer
For a stock 265/70R17 (31.6 in tall) there are 35 calculated sizes within ±3% on 17, 18 and 19 inch wheels (widths within 30 mm of stock). The closest is 285/65R17 (-0.1%). These are calculated sizes: check that a tire is sold in that size.
Plus sizing and winter minus sizing
Plus sizing puts a bigger wheel under the car and shortens the sidewall to keep the overall height. Winter “minus” sizing does the reverse by one wheel size: a taller sidewall on a smaller wheel for cold-weather tires. See plus sizing explained and winter tire sizing.
The ±3% rule of thumb is quoted by Discount Tire’s tire size calculator and 1010tires. It is a guideline, not a guarantee that a tire will fit or be safe on your vehicle.
What the list does not tell you
It does not know which tires are sold, which load index you need, how wide your wheel is, or what clears your suspension. A wider tire on a narrow wheel is a fitment problem even at the same height.
Always confirm the wheel width range for the tire, clearance at full steering lock and suspension travel, and the load index and speed rating for your vehicle. See how to read a tire size, the load index chart and the speed rating chart.
FAQ
What tire sizes can I use instead of my stock size?
Sizes within about 3% of the stock overall diameter are a common starting point, on your current wheel or on a plus or minus size wheel. Always confirm wheel width, clearance, load index and speed rating.
What is a winter tire minus size?
A winter tire on a wheel one inch smaller than stock, with a taller sidewall that keeps the overall height close. Choose the “Winter: one smaller” preset.
Does the list show tires I can buy?
No. It is calculated from standard widths and aspect ratios. We make no claim about which sizes are popular or in stock.
What tolerance should I use?
±3% is the usual rule of thumb. Use ±1 or ±2% to keep the speedometer closer to stock.