Which tire is taller, 155/70 R13 or 145/70 R13?

155/70 R13 is taller by 14.0 mm (2.56%) compared with 145/70 R13.

What is the diameter difference between 155/70 R13 and 145/70 R13?

155/70 R13 measures 547 mm overall diameter, 145/70 R13 measures 533 mm — a difference of 14.0 mm (2.56%).

How much speedometer error does this change create?

Switching from 155/70 R13 to 145/70 R13 changes the speedometer reading by -2.56%. At an indicated 100 km/h, your true speed becomes about 97.4 km/h.

Is 145/70 R13 a safe replacement for 155/70 R13?

Within ±3% diameter — generally considered a safe replacement from a speedometer-error standpoint, provided wheel offset, rim width and clearance also match your vehicle.

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

155/70 R13versus145/70 R13

Δ Ø -14.0 mmSpeedo -2.56%OEM-safe

145/70 R13 is shorter than 155/70 R13 — quicker gearing feel, tighter arch gap, livelier throttle response.

Going from 155/70 R13 to 145/70 R13 keeps the same wheel but slims the tire by 10 mm. This alternative fitment shifts overall diameter slightly from OEM. Expect a slight but noticeable shift in indicated speed compared to the original tires. The narrower section trims rolling resistance and tends to cut through snow more effectively. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.

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

Quick fitment verdict

155/70 R13 → 145/70 R13 at a glance

OEM Safe

Within ±3%

Inside factory tolerance — ABS, ESP and cruise control stay calibrated.

Fender Clearance

Clears fender

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

Speedometer Impact

-2.56%

At a true 100 km/h the dash reads 97.4 km/h — negligible.

Daily Driving

Livable

Daily use is fine; expect a slightly different ride and cruise rev count.

Side-by-side telemetry

Dimensional read-out

Current

155/70 R13

Diameter: 547.2 mm
Sidewall: 108.5 mm
Wheel: 13″
Width: 155 mm

Δ delta

Ø -14.0 mm

SW -7.0 mm

RH -7.0 mm

NewNew

145/70 R13

Diameter: 533.2 mm
Sidewall: 101.5 mm
Wheel: 13″
Width: 145 mm

Real-world effects

How this swap actually feels

Steering response
72/100 · Sharper turn-in
Ride comfort
48/100 · Firmer ride
Fuel economy
54/100 · Slightly lower drag
Highway cruising
52/100 · Higher cruise revs
Pothole resistance
42/100 · 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

-7.0 mm

Chassis drops — tighter arch gap, more aggressive stance.

New tire drops ride height by ~7.0 mm — tighter arch gap, lower stance.

Suspension travel · arch clearance

Wheel gap

Wheel sits closer to the fender

-7.0 mm

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

155/70 R13

145/70 R13

Wheel-gap Δ-7.0 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 97.4 km/h

-2.56%

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 155/70 R13 → 145/70 R13 swap — steering, comfort, stance and dash behavior in plain enthusiast language.

Steering feel

-7.0 mm sidewall

Sharper steering response

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

Ride firmness

70% → 70%

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

-10 mm width

Fender gap reads near-identical

Width delta is too small to change stance — same visual signature as OEM.

Speedometer behavior

-2.56%

OEM-safe speedometer reading

Inside the factory ±3% tolerance — ABS, ESP and cruise control behave as designed.

Daily drivability

Ø -14.0 mm

Livable upgrade with minor trade-offs

Daily use is fine; expect a slightly different cruise rev count and a touch more road feel.

Direct answer

Is 145/70 R13 OEM-safe?

Yes. Overall diameter changes by -2.56% versus 155/70 R13. OEM-safe. Speedometer, ABS, ESP and gearing remain inside the factory tolerance.

Direct answer

Will 145/70 R13 rub?

Borderline. Width changes by -10 mm and diameter by -14.0 mm. Borderline — check fender lip and inner strut clearance under load.

Direct answer

Does the speedometer change?

Yes — by -2.56%. Swapping 155/70 R13 for 145/70 R13 changes overall diameter, so at an indicated 100 km/h your true speed becomes 97.4 km/h. That's within the ±3% OEM tolerance — no recalibration needed.

Direct answer

Does lower sidewall affect comfort?

Yes — firmer ride. Sidewall changes by -7.0 mm (70% → 70%). Ride becomes firmer and steering sharper, but potholes and expansion joints hit harder and wheel damage risk rises.

Current Tire

155/70R13

Width

Ratio

Rim

New Tire

145/70R13

Width

Ratio

Rim

Fitment · Scaled comparison

● Excellent fit

155/70 R13

Diameter

-14.0 mm

-2.56%

Sidewall

-7.0 mm

Speedometer

97.4 km/h

at true 100

Clearance

Excellent fit

145/70 R13

Ground line · Scaled comparison

Excellent Fit

Within ±3% — safe for daily driving

Diameter change

-14.0 mm

-2.56%

Speedometer at 100

97.4 km/h

-2.56% error

Ground clearance

-7.0 mm

ride height delta

Sidewall change

-7.0 mm

revs/km: 597.0

Open visual comparisonCompare visually

Permalink for this comparison:

/compare/155-70-r13-vs-145-70-r13

Detailed comparison

Metric	155/70 R13	145/70 R13	Difference
Overall diameter	547.2 mm	533.2 mm	-14.0 mm (-2.56%)
Sidewall height	108.5 mm	101.5 mm	-7.0 mm
Circumference	1.719 m	1.675 m	-44.0 mm
Revs / km	581.7	597.0	+15.3
Ground clearance	reference	-7.0 mm	-7.0 mm
Speedometer @ 100 km/h	100.0 km/h	97.4 km/h	-2.56 km/h

Verdict: excellent

Within ±3% — speedometer, ABS and traction control should behave normally.

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

155/70 R13

Profile: 70%
Circumference: 1.719 m

New

145/70 R13

Profile: 70%
Circumference: 1.675 m

Side-by-side fitment

Geometry

Current

155/70 R13

Section width: 155 mm
Aspect ratio: 70%
Sidewall: 108.5 mm
Wheel diameter: 13″(330 mm)
Overall diameter: 547.2 mm(21.54″)
Circumference: 1.719 m
Revs / km: 581.7

New

145/70 R13

Section width: 145 mm
Aspect ratio: 70%
Sidewall: 101.5 mm
Wheel diameter: 13″(330 mm)
Overall diameter: 533.2 mm(20.99″)
Circumference: 1.675 m
Revs / km: 597.0

Real-world consequences

Pros / cons

Narrower tire (-10 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 (-14.0 mm)

Rolling diameter

Shorter effective gearing — perkier acceleration
Lower center of gravity, sharper transitions
More fender and arch clearance
Speedometer reads high by ~2.6%
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

Cluster preview

Within tolerance

Speedometer impact

At a true 100 km/h, your dashboard will read 97.4 km/h after switching to 145/70 R13 — a -2.56% 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 -7.0 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

155/70 R13

Back to

145/70 R13

Drivers also compare

Closely-related fitments and plus-size swaps for 155/70 R13 and 145/70 R13.

155/70 R13 vs 165/70 R13

Wider variation on the same rim — more grip, less clearance.

Δ 2.56%

155/70 R13 vs 175/70 R13

Wider variation on the same rim — more grip, less clearance.

Δ 4.87%

145/70 R13 vs 165/70 R13

Wider variation on the same rim — more grip, less clearance.

Δ 4.99%

155/70 R13 vs 165/65 R14

Aggressive +1 inch swap — verify speedometer drift.

Δ 4.18%

155/70 R13versus145/70 R13

Generate fitment card

Sharper steering response

Slightly firmer over rough pavement

Fender gap reads near-identical

OEM-safe speedometer reading

Livable upgrade with minor trade-offs

Is 145/70 R13 OEM-safe?

Will 145/70 R13 rub?

Does the speedometer change?

Does lower sidewall affect comfort?

Detailed comparison

Verdict: excellent

Narrower tire (-10 mm)

Shorter overall (-14.0 mm)

Speedometer impact

Ground clearance change

Drivers also compare

Frequently asked questions

Which tire is taller, 155/70 R13 or 145/70 R13?

What is the diameter difference between 155/70 R13 and 145/70 R13?

How much speedometer error does this change create?

Is 145/70 R13 a safe replacement for 155/70 R13?

What else should I check before changing tire size?