165/65R13 vs 175/60R13: Tyre Size Comparison, Diameter Difference & Speedometer Effect

165/65R13 and 175/60R13 look like near neighbours on paper, but the numbers tell a more precise story. 175/60R13 is the shorter tyre: its diameter is 540.2 mm against 544.7 mm, -4.5 mm (-0.8%) smaller. Width moves +10 mm, sidewall height moves -2.2 mm, and the circumference changes by -14.1 mm, which is what the speedometer feels. This comparison works through the side-by-side measurements, the speedometer error at 30, 50 and 70 mph in both directions, and the practical effects on ride comfort, grip and wheel-arch clearance.

Two things decide whether this swap makes sense: the diameter difference and the physical fit. On diameter, 175/60R13 is -0.8% smaller than 165/65R13, which is inside the plus-or-minus 3% guideline. On physical fit, the width change of +10 mm and the rim change from 13 to 13 inches both need checking against the arches, suspension and steering lock. The sections below take each of those in turn, with the numbers worked out rather than asserted.

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.

165/65R13 vs 175/60R13 side by side

Measurement 165/65R13 175/60R13 Difference
Overall diameter 544.7 mm (21.4 in) 540.2 mm (21.3 in) -4.5 mm (-0.8%)
Sidewall height 107.2 mm 105.0 mm -2.2 mm
Circumference 1711.2 mm 1697.1 mm -14.1 mm
Revolutions per mile 940.5 948.3 +7.8
Section width 165 mm 175 mm +10 mm
Rim diameter 13 in 13 in +0 in

Diameter difference between 165/65R13 and 175/60R13: -4.5 mm (-0.8%)

Put the percentage in context. The plus-or-minus 3% guideline exists because small diameter changes produce small speedometer errors, and this change is -0.8%, which is inside that band. In revs per mile the shift is +7.8 (940.5 to 948.3), and in circumference it is -14.1 mm per turn. Those are not abstract figures: every mile you drive, the car covers -14.1 mm more or less per wheel revolution than the instruments expect, and the gap accumulates exactly like interest.

Speedometer error: 165/65R13 to 175/60R13 and back

Here is what the speedometer does in practice. Fit 175/60R13 where 165/65R13 was, and the dial understates or overstates speed by 0.8%: indicated 30 mph is really 29.8 mph, indicated 50 mph is really 49.6 mph, and indicated 70 mph is really 69.4 mph. Swap back from 175/60R13 to 165/65R13 and the error flips sign — 70 mph indicated becomes 70.6 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 175/60R13 (from 165/65R13) Actual speed fitting 165/65R13 (from 175/60R13)
30 mph 29.8 mph 30.2 mph
50 mph 49.6 mph 50.4 mph
70 mph 69.4 mph 70.6 mph

Sidewall height and ride comfort: 165/65R13 vs 175/60R13

The sidewall is where the ride difference lives. 165/65R13 has 107.2 mm of sidewall and 175/60R13 has 105.0 mm, a change of -2.2 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: 65% for 165/65R13 against 60% for 175/60R13. 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: 165/65R13 vs 175/60R13

The width gap is 10 mm (165 mm against 175 mm). Going wider usually buys dry grip and a more planted feel, and it costs a little in rolling resistance and road noise. Remember that width also decides whether the tyre fits the rim: a 175 mm tyre needs a rim width within the range its maker approves, and a rim that suited 165/65R13 may not suit 175/60R13. That is a separate check from the diameter comparison, and it belongs on the list before anything is fitted.

Revolutions per mile and gearing: 165/65R13 vs 175/60R13

Think of the gearing change as the diameter change in disguise. The revs-per-mile gap is +7.8, which is 0.8% 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 0.8% and no more. Small percentages mean small effects, which is another reason the plus-or-minus 3% guideline is a useful yardstick.

Will 175/60R13 clear after 165/65R13? What to check before fitting

Do not skip the physical check. The diameter difference is -0.8% and the width difference is +10 mm, and both of those affect whether 175/60R13 fits where 165/65R13 did. Check the gap between the tyre and the arch, the gap to the suspension arms and struts, and the clearance at full steering lock in both directions. Repeat the check with weight in the car, because suspension travel changes the geometry. If the tyre touches anything at any point in that check, it does not fit, whatever the diameter percentage says. The load index and speed rating need confirming against the placard too, and the rim width must suit a 175 mm tyre.

Which size suits which priority: 165/65R13 or 175/60R13

The decision comes down to priorities. Comfort follows the sidewall (-2.2 mm here). Grip follows the width (+10 mm here). Instrument accuracy follows the diameter (-0.8% here). Gearing and cruising engine speed follow the revs-per-mile change (+7.8). None of those is large in this comparison, which is why the practical checks — clearance, load index, speed rating, rim width — deserve as much attention as the numbers. Get those right and the size choice becomes a matter of preference rather than a risk.

Related 165/65R13 vs 175/60R13 comparisons and tools

Frequently asked questions

What is the diameter difference between 165/65R13 and 175/60R13?

175/60R13 is -4.5 mm (-0.8%) smaller in diameter than 165/65R13: 540.2 mm against 544.7 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 175/60R13 instead of 165/65R13?

Taking 165/65r13 vs 175/60r13 tyre size comparison as the case in point: The error follows the diameter ratio, -0.8%. At an indicated 30 mph the true speed would be 29.8 mph, at 50 mph indicated it would be 49.6 mph, and at 70 mph indicated it would be 69.4 mph. The full table in both directions is in the speedometer section above.

Is 175/60R13 wider than 165/65R13, and does that matter?

Yes — 175/60R13 is 175 mm wide against 165 mm for 165/65R13, a difference of +10 mm. A wider tyre generally gives more dry grip and can increase rolling resistance and road noise slightly. Width also affects clearance, so check the arches and suspension at full lock.

Will 175/60R13 fit my car if 165/65R13 fits?

Not necessarily. 175/60R13 is shorter by 4.5 mm and 10 mm wider, and it needs a 13-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, 165/65R13 or 175/60R13?

Neither is better in general — it depends on what you want. 175/60R13 has a -2.2 mm sidewall difference, a +10 mm width difference and a -0.8% 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.