165/65R13 vs 165/60R14: Tyre Size Comparison, Diameter Difference & Speedometer Effect

165/65R13 and 165/60R14 look like near neighbours on paper, but the numbers tell a more precise story. 165/60R14 is the taller tyre: its diameter is 553.6 mm against 544.7 mm, +8.9 mm (+1.6%) larger. Width moves +0 mm, sidewall height moves -8.2 mm, and the circumference changes by +28.0 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.

Before the tables, keep the context straight. These are nominal new-tyre dimensions, computed from the size codes: real tyres vary slightly by brand, model, wear and inflation pressure. A +1.6% difference is within the plus-or-minus 3% guideline that is commonly used for speedometer accuracy, and the speedometer tables below show exactly what that percentage means at real road speeds. The rest of the page covers sidewall, grip, gearing and the clearance checks that decide whether the larger size can physically fit. That is the point this page works through for 165/65r13 vs 165/60r14.

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 165/60R14 side by side

Measurement 165/65R13 165/60R14 Difference
Overall diameter 544.7 mm (21.4 in) 553.6 mm (21.8 in) +8.9 mm (+1.6%)
Sidewall height 107.2 mm 99.0 mm -8.2 mm
Circumference 1711.2 mm 1739.2 mm +28.0 mm
Revolutions per mile 940.5 925.3 -15.2
Section width 165 mm 165 mm +0 mm
Rim diameter 13 in 14 in +1 in

Diameter difference between 165/65R13 and 165/60R14: +8.9 mm (+1.6%)

A +1.6% diameter change is small enough to sit inside the commonly used plus-or-minus 3% guideline, so the speedometer error it introduces stays modest. The circumference changes by +28.0 mm per revolution, and the revs per mile change by -15.2, which is the same story told from the car's point of view: the instruments count revolutions, so fewer revs per mile means the car travels further per revolution than the instruments assume. That drift also affects the odometer, so recorded mileage moves by the same percentage over time.

Speedometer error: 165/65R13 to 165/60R14 and back

Going from 165/65R13 to 165/60R14, the diameter grows by +1.6%, so the true speed is the indicated speed multiplied by 1.016. At 30 mph on the dial the car is really doing 30.5 mph; at 50 mph indicated it is 50.8 mph; at 70 mph indicated it is 71.1 mph. The speedometer therefore reads low after the change, which matters most at motorway speed, where even a small percentage is a real difference in miles per hour. Going the other way, from 165/60R14 back to 165/65R13, the error reverses exactly: the ratio becomes 0.984, so 70 mph indicated is really 68.9 mph.

Indicated speed Actual speed fitting 165/60R14 (from 165/65R13) Actual speed fitting 165/65R13 (from 165/60R14)
30 mph 30.5 mph 29.5 mph
50 mph 50.8 mph 49.2 mph
70 mph 71.1 mph 68.9 mph

Sidewall height and ride comfort: 165/65R13 vs 165/60R14

The sidewall is where the ride difference lives. 165/65R13 has 107.2 mm of sidewall and 165/60R14 has 99.0 mm, a change of -8.2 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 165/60R14. 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 165/60R14

Width changes by +0 mm, from 165 mm to 165 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: 165/65R13 vs 165/60R14

Think of the gearing change as the diameter change in disguise. The revs-per-mile gap is -15.2, which is 1.6% 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 1.6% and no more. Small percentages mean small effects, which is another reason the plus-or-minus 3% guideline is a useful yardstick.

Will 165/60R14 clear after 165/65R13? What to check before fitting

Do not skip the physical check. The diameter difference is +1.6% and the width difference is +0 mm, and both of those affect whether 165/60R14 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 165 mm tyre.

Which size suits which priority: 165/65R13 or 165/60R14

Choose on the basis of what matters to you, not on the headline alone. If ride comfort matters most, the sidewall change of -8.2 mm is the figure to weigh. If grip matters most, the width change of +0 mm is the one to weigh. If keeping the instruments accurate matters most, the diameter change of +1.6% is the one to weigh — and if it is outside the plus-or-minus 3% guideline, ask about recalibration. And if the answer to the clearance check is uncertain, that outranks all three: a tyre that rubs is not a viable option at any percentage.

Related 165/65R13 vs 165/60R14 comparisons and tools

Frequently asked questions

What is the diameter difference between 165/65R13 and 165/60R14?

165/60R14 is +8.9 mm (+1.6%) larger in diameter than 165/65R13: 553.6 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 165/60R14 instead of 165/65R13?

For 165/65r13 vs 165/60r14, the point is this: The error follows the diameter ratio, +1.6%. At an indicated 30 mph the true speed would be 30.5 mph, at 50 mph indicated it would be 50.8 mph, and at 70 mph indicated it would be 71.1 mph. The full table in both directions is in the speedometer section above.

Is 165/60R14 wider than 165/65R13, and does that matter?

Neither — 165/60R14 is 165 mm wide against 165 mm for 165/65R13, 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 165/60R14 fit my car if 165/65R13 fits?

Not necessarily. 165/60R14 is taller by 8.9 mm and 0 mm the same width, and it needs a 14-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 165/60R14?

Neither is better in general — it depends on what you want. 165/60R14 has a -8.2 mm sidewall difference, a +0 mm width difference and a +1.6% 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.