Tire Size Box

195/35R17 vs 195/40R17

195/40R17 compared with 195/35R17

+3.4% diameter, 0.0" width

195/40R17 is 23.14" tall vs 22.37". More than the 3% rule of thumb, so check carefully before switching.

22.4"17" rim2.7"7.7" wide
195/35R17 (solid) compared with 195/40R17 (dashed outline), drawn to scale

With 195/40R17 tires, when your speedometer says 60 mph you are really going

62.1 mph

195/40R17 is +0.77 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

195/35R17195/40R17Difference%
Overall diameter22.37"23.14"+0.77"+3.4%
Section width7.68"7.68"0.00"0.0%
Sidewall height2.69"3.07"+0.38"+14.3%
Circumference70.29"72.70"+2.41"+3.4%
Revolutions per mile901.4871.5−29.9−3.3%

Speedometer difference

If your vehicle came with 195/35R17 and you fit 195/40R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.4 mph+1.4 mph
50 mph51.7 mph+1.7 mph
60 mph62.1 mph+2.1 mph
65 mph67.2 mph+2.2 mph
70 mph72.4 mph+2.4 mph
75 mph77.6 mph+2.6 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 195/35R17 or 195/40R17?
195/40R17 is taller by 0.77 inches (23.14" vs 22.37"). 195/35R17 is the same width.
Can I replace 195/35R17 with 195/40R17?
It is not recommended without checking carefully. The diameter difference is +3.4%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 195/40R17 change my speedometer?
When your speedometer reads 60 mph with 195/40R17 fitted (calibrated for 195/35R17), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.4%.
Will 195/40R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.38 inches of ground clearance at the axle.

Other comparisons