195/80R15 vs 195/75R16: Tyre Size Comparison, Diameter Difference & Speedometer Effect

If you are choosing between 195/80R15 and 195/75R16, the first question is how far apart they really are. 195/75R16 is the taller tyre: its diameter is 698.9 mm against 693.0 mm, +5.9 mm (+0.9%) larger. The sidewall goes from 156.0 mm to 146.2 mm (-9.8 mm), the circumference from 2177.1 mm to 2195.7 mm, and the revs per mile from 739.2 to 733.0. The tables below lay all of that out, then work through the speedometer effect in each direction and the clearance checks that matter before either size goes on the car.

Taking 195/80r15 vs 195/75r16 as the case in point: The short version: a +0.9% diameter difference is inside the commonly used plus-or-minus 3% guideline, which is the usual yardstick for keeping speedometer error small. But diameter is only the first check. The two sizes also differ in width by 0 mm and in rim size (15 inches against 16 inches), so a swap means different wheels as well unless the rims already match. Read the whole comparison before deciding — the clearance and load-index sections matter as much as the headline percentage.

This is a calculation, not a safety approval. Always check your vehicle's door-jamb placard, load index and speed rating, and confirm fitment with a tyre professional before fitting a different tyre size.

195/80R15 vs 195/75R16 side by side

Measurement 195/80R15 195/75R16 Difference
Overall diameter 693.0 mm (27.3 in) 698.9 mm (27.5 in) +5.9 mm (+0.9%)
Sidewall height 156.0 mm 146.2 mm -9.8 mm
Circumference 2177.1 mm 2195.7 mm +18.6 mm
Revolutions per mile 739.2 733.0 -6.2
Section width 195 mm 195 mm +0 mm
Rim diameter 15 in 16 in +1 in

Diameter difference between 195/80R15 and 195/75R16: +5.9 mm (+0.9%)

The diameter gap of +5.9 mm (+0.9%) is the number to carry away from this section. It is inside the plus-or-minus 3% guideline, and it shows up directly in the speedometer tables below. The circumference difference of +18.6 mm and the revs-per-mile difference of -6.2 are the same change expressed differently — the first is what the road sees, the second is what the car's sensors count. Neither is a safety judgement on its own; both are inputs to the fitment checks further down the page.

Speedometer error: 195/80R15 to 195/75R16 and back

Here is what the speedometer does in practice. Fit 195/75R16 where 195/80R15 was, and the dial understates or overstates speed by 0.9%: indicated 30 mph is really 30.3 mph, indicated 50 mph is really 50.4 mph, and indicated 70 mph is really 70.6 mph. Swap back from 195/75R16 to 195/80R15 and the error flips sign — 70 mph indicated becomes 69.4 mph. The odometer drifts by the same percentage in each direction, so recorded mileage and any service intervals based on it shift too.

Indicated speed Actual speed fitting 195/75R16 (from 195/80R15) Actual speed fitting 195/80R15 (from 195/75R16)
30 mph 30.3 mph 29.7 mph
50 mph 50.4 mph 49.6 mph
70 mph 70.6 mph 69.4 mph

Sidewall height and ride comfort: 195/80R15 vs 195/75R16

The sidewall is where the ride difference lives. 195/80R15 has 156.0 mm of sidewall and 195/75R16 has 146.2 mm, a change of -9.8 mm. Less sidewall generally means sharper steering response and less cushioning, so more of the road surface reaches the cabin. The aspect ratios tell the same story in percentage terms: 80% for 195/80R15 against 75% for 195/75R16. Sidewall height also affects vulnerability to kerb damage — a shorter sidewall leaves less rubber between the rim and the road.

Width, grip and fuel use: 195/80R15 vs 195/75R16

Width changes by +0 mm, from 195 mm to 195 mm. With the same width, the contact patch is essentially unchanged, so the grip difference between these two sizes comes from the construction and compound rather than the dimensions. Fuel use moves with rolling resistance, so a wider tyre can cost a small amount of fuel over time — the effect is real but modest for a change of this size, and it is not something this page can put a precise number on without knowing the exact tyre models involved.

Revolutions per mile and gearing: 195/80R15 vs 195/75R16

Think of the gearing change as the diameter change in disguise. The revs-per-mile gap is -6.2, which is 0.9% of the original figure — the same percentage as the diameter gap. That is because revs per mile is just a mile divided by the circumference, and the circumference is pi times the diameter. So everything the gearing does — engine speed at a given road speed, acceleration in each gear, cruising refinement — shifts by 0.9% and no more. Small percentages mean small effects, which is another reason the plus-or-minus 3% guideline is a useful yardstick.

Will 195/75R16 clear after 195/80R15? What to check before fitting

Clearance is the check the numbers cannot do for you. 195/75R16 is taller and 0 mm the same width than 195/80R15, so check the wheel arches, the suspension components and the steering lock: turn the wheel fully in both directions and check for contact, and check again with the suspension compressed and the car loaded as it will actually be used. A size that clears when the car is stationary and unloaded can still rub over a bump or at full lock. This page does not claim that 195/75R16 clears your car, and no diameter table can — only a physical check on your vehicle can confirm it. Also confirm the load index and speed rating of 195/75R16 meet what your placard asks for, and that the 16-inch rim suits the car.

Which size suits which priority: 195/80R15 or 195/75R16

Weigh the four effects separately. Sidewall (-9.8 mm) for comfort. Width (+0 mm) for grip and rolling resistance. Diameter (+0.9%) for the speedometer, odometer and gearing. And clearance for whether the swap is physically possible at all. If the diameter is inside the plus-or-minus 3% guideline and the clearance check passes, the remaining differences are small enough to be a matter of taste; if either of those fails, the comparison is academic until it is resolved.

Related 195/80R15 vs 195/75R16 comparisons and tools

Frequently asked questions

What is the diameter difference between 195/80R15 and 195/75R16?

195/75R16 is +5.9 mm (+0.9%) larger in diameter than 195/80R15: 698.9 mm against 693.0 mm. That is inside the commonly used plus-or-minus 3% guideline for keeping speedometer error small.

How much will my speedometer be out if I fit 195/75R16 instead of 195/80R15?

The error follows the diameter ratio, +0.9%. At an indicated 30 mph the true speed would be 30.3 mph, at 50 mph indicated it would be 50.4 mph, and at 70 mph indicated it would be 70.6 mph. The full table in both directions is in the speedometer section above. That is the point this page works through for 195/80r15 vs 195/75r16.

Is 195/75R16 wider than 195/80R15, and does that matter?

Neither — 195/75R16 is 195 mm wide against 195 mm for 195/80R15, a difference of +0 mm. With the same width, grip differences come from the specific tyre rather than the size. Width also affects clearance, so check the arches and suspension at full lock.

Will 195/75R16 fit my car if 195/80R15 fits?

Not necessarily. 195/75R16 is taller by 5.9 mm and 0 mm the same width, and it needs a 16-inch rim. Check the wheel arches, suspension and steering lock at full lock in both directions, with the car loaded, and confirm the load index and speed rating against your door-jamb placard. A tyre professional can confirm fitment on your vehicle.

Which size is better, 195/80R15 or 195/75R16?

Neither is better in general — it depends on what you want. 195/75R16 has a -9.8 mm sidewall difference, a +0 mm width difference and a +0.9% diameter difference, so the trade-offs are comfort, grip and instrument accuracy respectively. If the diameter is within the plus-or-minus 3% guideline and the clearance check passes, the choice is a matter of preference; if not, resolve those two points first.