Which tire is taller, 265/60 R18 or 245/60 R18?

265/60 R18 is taller by 24.0 mm (3.10%) compared with 245/60 R18.

What is the diameter difference between 265/60 R18 and 245/60 R18?

265/60 R18 measures 775 mm overall diameter, 245/60 R18 measures 751 mm — a difference of 24.0 mm (3.10%).

How much speedometer error does this change create?

Switching from 265/60 R18 to 245/60 R18 changes the speedometer reading by -3.10%. At an indicated 100 km/h, your true speed becomes about 96.9 km/h.

Is 245/60 R18 a safe replacement for 265/60 R18?

Between 3% and 5% diameter difference — speedometer drift is noticeable. Consider recalibration and confirm clearance with your vehicle's manufacturer specification.

What else should I check before changing tire size?

Beyond diameter and speedometer error, verify wheel offset (ET), rim width, hub bore, load index, brake and suspension clearance, and your vehicle's manufacturer specification. Local regulations may also limit how far you can deviate from OEM.

Fitment comparison

265/60 R18versus245/60 R18

Δ Ø -24.0 mmSpeedo -3.10%Borderline

245/60 R18 is shorter than 265/60 R18 — quicker gearing feel, tighter arch gap, livelier throttle response.

Going from 265/60 R18 to 245/60 R18 keeps the same wheel but slims the tire by 20 mm. This sizing approach noticeably changes overall diameter compared to OEM.

The speedometer error is noticeable and may warrant a recalibration if you rely on indicated speed. Less width usually means lower rolling resistance and easier chain or winter-tire fitment. Diameter delta falls in the cautious 3–5% range, where speedometer recalibration and a careful clearance check are worth doing.

TakeSensible when prioritizing efficiency, winter traction or extra clearance over outright grip.

Quick fitment verdict

265/60 R18 → 245/60 R18 at a glance

OEM Safe

Borderline

Noticeable drift from OEM — drivable, but recalibration is wise.

Fender Clearance

Clears fender

Width and diameter stay close to stock — arch clearance unchanged.

Speedometer Impact

-3.10%

Dash reads 96.9 km/h at a true 100 km/h — visible drift.

Daily Driving

Aggressive

Geometry deviates enough to matter — confirm clearance before daily use.

Side-by-side telemetry

Dimensional read-out

Current

265/60 R18

Diameter: 775.2 mm
Sidewall: 159.0 mm
Wheel: 18″
Width: 265 mm

Δ delta

Ø -24.0 mm

SW -12.0 mm

RH -12.0 mm

NewNew

245/60 R18

Diameter: 751.2 mm
Sidewall: 147.0 mm
Wheel: 18″
Width: 245 mm

Real-world effects

How this swap actually feels

Steering response
74/100 · Sharper turn-in
Ride comfort
46/100 · Firmer ride
Fuel economy
39/100 · Slightly lower drag
Highway cruising
46/100 · Higher cruise revs
Pothole resistance
40/100 · Less wheel protection

Shareable card

Generate fitment card

Export a garage-grade telemetry card of this comparison — perfect for forums, Reddit and Discord.

Ride height

Lower stance

-12.0 mm

Chassis drops — tighter arch gap, more aggressive stance.

New tire drops ride height by ~12.0 mm — tighter arch gap, lower stance.

Suspension travel · arch clearance

Wheel gap

Wheel sits closer to the fender

-12.0 mm

How the arch-to-tire gap reads from across the parking lot — the visual stance change everyone notices first.

265/60 R18

245/60 R18

Wheel-gap Δ-12.0 mm

Static · unloaded chassis

Fender relationship

Tucked · Flush · Poke

Stance language

The visual relationship between the tire's outer edge and the fender lip — the lens enthusiasts use to judge a fitment.

Tucked

Inside fender

Flush

Lip-aligned

Poke

Outside fender

Width & offset dependent

Speedometer reality

Dash reads 96.9 km/h

-3.10%

Shorter rubber: dashboard reads conservatively low — you're slower than it claims.

ABS · ESP · cruise control

Setup telemetry

How this setup changes the car

Driver-perspective read-out of the 265/60 R18 → 245/60 R18 swap — steering, comfort, stance and dash behavior in plain enthusiast language.

Steering feel

-12.0 mm sidewall

Sharper steering response

Shorter sidewall transmits inputs faster — quicker turn-in, more confident on-center feel.

Ride firmness

60% → 60%

Slightly firmer over rough pavement

Expect more chatter on broken tarmac and a sharper pothole strike — keep an eye on wheel damage risk.

Fender relationship

-20 mm width

More tuck under the arch

Narrower contact patch tucks slightly inboard — cleaner look from the rear three-quarter.

Speedometer behavior

-3.10%

Noticeable speedo drift

Drift is visible at highway speeds; ABS still works but loses a sliver of precision.

Daily drivability

Ø -24.0 mm

Aggressive setup — verify before daily use

Geometry deviates enough to matter — check clearance, recalibrate the dash, then re-evaluate.

Direct answer

Is 245/60 R18 OEM-safe?

Borderline. Overall diameter changes by -3.10% versus 265/60 R18. Borderline. Drivable, but speedometer drift becomes noticeable and ABS calibration is affected.

Direct answer

Will 245/60 R18 rub?

Borderline. Width changes by -20 mm and diameter by -24.0 mm. Borderline — check fender lip and inner strut clearance under load.

Direct answer

Does the speedometer change?

Yes — by -3.10%. Swapping 265/60 R18 for 245/60 R18 changes overall diameter, so at an indicated 100 km/h your true speed becomes 96.9 km/h. That's noticeable drift but usually safe.

Direct answer

Does lower sidewall affect comfort?

Yes — firmer ride. Sidewall changes by -12.0 mm (60% → 60%). Ride becomes firmer and steering sharper, but potholes and expansion joints hit harder and wheel damage risk rises.

Current Tire

265/60R18

Width

Ratio

Rim

New Tire

245/60R18

Width

Ratio

Rim

Fitment · Scaled comparison

● Borderline

265/60 R18

Diameter

-24.0 mm

-3.10%

Sidewall

-12.0 mm

Speedometer

96.9 km/h

at true 100

Clearance

Borderline

245/60 R18

Ground line · Scaled comparison

Slight Difference

Within ±5% — usable, recalibration recommended

Diameter change

-24.0 mm

-3.10%

Speedometer at 100

96.9 km/h

-3.10% error

Ground clearance

-12.0 mm

ride height delta

Sidewall change

-12.0 mm

revs/km: 423.7

Open visual comparisonCompare visually

Permalink for this comparison:

/compare/265-60-r18-vs-245-60-r18

Detailed comparison

Metric	265/60 R18	245/60 R18	Difference
Overall diameter	775.2 mm	751.2 mm	-24.0 mm (-3.10%)
Sidewall height	159.0 mm	147.0 mm	-12.0 mm
Circumference	2.435 m	2.360 m	-75.4 mm
Revs / km	410.6	423.7	+13.1
Ground clearance	reference	-12.0 mm	-12.0 mm
Speedometer @ 100 km/h	100.0 km/h	96.9 km/h	-3.10 km/h

Verdict: warning

Between 3% and 5% — noticeable speedometer drift; recalibration may be advisable.

Dimensional comparison

Side-by-side

Scaled engineering side-profile of both tires. Width, sidewall and overall diameter are dimensioned so you can see the change at a glance — without parsing the numbers.

Current

265/60 R18

Profile: 60%
Circumference: 2.435 m

New

245/60 R18

Profile: 60%
Circumference: 2.360 m

Side-by-side fitment

Geometry

Current

265/60 R18

Section width: 265 mm
Aspect ratio: 60%
Sidewall: 159.0 mm
Wheel diameter: 18″(457 mm)
Overall diameter: 775.2 mm(30.52″)
Circumference: 2.435 m
Revs / km: 410.6

New

245/60 R18

Section width: 245 mm
Aspect ratio: 60%
Sidewall: 147.0 mm
Wheel diameter: 18″(457 mm)
Overall diameter: 751.2 mm(29.57″)
Circumference: 2.360 m
Revs / km: 423.7

Real-world consequences

Pros / cons

Narrower tire (-20 mm)

Section width

Better aquaplaning resistance
Lower rolling resistance and slightly better MPG
Quieter ride, less tramlining
Lighter unsprung mass on the corner
Less dry grip at the limit
Smaller contact patch under hard braking
Stance can look tucked or undersized

Shorter overall (-24.0 mm)

Rolling diameter

Shorter effective gearing — perkier acceleration
Lower center of gravity, sharper transitions
More fender and arch clearance
Speedometer reads high by ~3.1%
Engine spins higher at cruise, small MPG hit
ABS / ESP recalibration may be advisable

How it changes driving feel

Seat-of-the-pants

Steering response

Softer, slower

Ride comfort

Comparable

Road noise

Similar cabin noise

Wet / aquaplaning

Comparable wet behavior

Fuel economy

Negligible change

Curb / pothole protection

About the same

Fitment risk check

Verify before install

Speedometer drift

~3.1% — borderline; recalibration recommended.

Reduced gearing range

Shorter rolling diameter raises cruise RPM and effective gearing.

Cluster preview

Borderline

Speedometer impact

At a true 100 km/h, your dashboard will read 96.9 km/h after switching to 245/60 R18 — a -3.10% offset. Use the speedometer error calculator for any indicated speed, and the speedometer error guide for the full background.

Ground clearance change

The new tire's half-diameter changes ride height by -12.0 mm. Small differences are absorbed by suspension travel, but anything beyond ±10 mm can affect headlight aim, fender clearance and bump-stop margin. See the plus-sizing guide before committing.

Back to

265/60 R18

Back to

245/60 R18