Which tire is taller, 155/70 R13 or 155/80 R13?

155/80 R13 is taller by 31.0 mm (5.67%) compared with 155/70 R13.

What is the diameter difference between 155/70 R13 and 155/80 R13?

155/70 R13 measures 547 mm overall diameter, 155/80 R13 measures 578 mm — a difference of 31.0 mm (5.67%).

How much speedometer error does this change create?

Switching from 155/70 R13 to 155/80 R13 changes the speedometer reading by +5.67%. At an indicated 100 km/h, your true speed becomes about 105.7 km/h.

Is 155/80 R13 a safe replacement for 155/70 R13?

Over 5% diameter difference. This is outside the common safe range and can affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.

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 R13versus155/80 R13

Δ Ø +31.0 mmSpeedo +5.67%Aggressive

155/80 R13 stands taller than 155/70 R13 — bigger rolling diameter, slightly more clearance, calmer cruise revs.

Going from 155/70 R13 to 155/80 R13 raises the aspect ratio by 10 points on the same 13-inch wheel. This sizing approach moves rolling diameter well outside the usual OEM tolerance. The taller sidewall adds cushioning over potholes and rougher roads, with a softer overall ride.

Speedometer error is large enough that recalibration is effectively required for accurate readings. A diameter change beyond 5% is aggressive enough to influence ABS, traction control and gearing; treat it as a serious modification.

TakeTreat as a serious modification — verify clearance, recalibrate the speedometer and reassess load capacity.

Quick fitment verdict

155/70 R13 → 155/80 R13 at a glance

OEM Safe

Out of spec

Beyond OEM tolerance — speedometer and ABS need professional review.

Fender Clearance

Likely rubs

Significantly wider/taller — rubbing risk on liners or fender lip is real.

Speedometer Impact

+5.67%

Dash reads 105.7 km/h at a true 100 km/h — recalibrate.

Daily Driving

Aggressive

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

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 +31.0 mm

SW +15.5 mm

RH +15.5 mm

NewNew

155/80 R13

Diameter: 578.2 mm
Sidewall: 124.0 mm
Wheel: 13″
Width: 155 mm

Real-world effects

How this swap actually feels

Steering response
34/100 · Softer turn-in
Ride comfort
86/100 · More cushion
Fuel economy
61/100 · Slightly lower drag
Highway cruising
79/100 · Lower cruise revs
Pothole resistance
84/100 · More wheel protection

Shareable card

Generate fitment card

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

Ride height

Lifted stance

+15.5 mm

Chassis sits higher — slightly more clearance, wheel-gap visually grows.

New tire lifts the chassis by ~15.5 mm — more clearance, slightly more wheel-gap.

Suspension travel · arch clearance

Wheel gap

Wheel gap visually increases

+15.5 mm

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

155/70 R13

155/80 R13

Wheel-gap Δ+15.5 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 105.7 km/h

+5.67%

Taller rubber: at a true 100 km/h your dashboard reads optimistically high.

ABS · ESP · cruise control

Setup telemetry

How this setup changes the car

Driver-perspective read-out of the 155/70 R13 → 155/80 R13 swap — steering, comfort, stance and dash behavior in plain enthusiast language.

Steering feel

+15.5 mm sidewall

Softer, more relaxed turn-in

Taller sidewall flexes a touch more before loading the contact patch — calmer, comfort-tuned.

Ride firmness

70% → 80%

Softer over potholes and joints

Bumps and expansion joints are absorbed better — a comfort win for daily driving.

Fender relationship

+0 mm width

Fender gap reads near-identical

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

Speedometer behavior

+5.67%

Out of tolerance — recalibrate

Beyond ±5% — speedometer, gearing and ABS calibration all need a professional review.

Daily drivability

Ø +31.0 mm

Aggressive setup — verify before daily use

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

Direct answer

Is 155/80 R13 OEM-safe?

No. Overall diameter changes by +5.67% versus 155/70 R13. Not OEM-safe. Overall diameter strays beyond ±5% — recalibration and clearance review are required.

Direct answer

Will 155/80 R13 rub?

Possibly. Width changes by +0 mm and diameter by +31.0 mm. Possible rub at full lock or full suspension compression — verify fender lip and inner strut clearance before committing.

Direct answer

Does the speedometer change?

Yes — by +5.67%. Swapping 155/70 R13 for 155/80 R13 changes overall diameter, so at an indicated 100 km/h your true speed becomes 105.7 km/h. That's outside safe tolerance — recalibrate.

Direct answer

Does lower sidewall affect comfort?

Yes — softer ride. Sidewall changes by +15.5 mm (70% → 80%). Ride softens and absorbs bumps better, with slightly less precise turn-in.

Current Tire

155/70R13

Width

Ratio

Rim

New Tire

155/80R13

Width

Ratio

Rim

Fitment · Scaled comparison

● Not recommended

155/70 R13

Diameter

+31.0 mm

+5.67%

Sidewall

+15.5 mm

Speedometer

105.7 km/h

at true 100

Clearance

Not recommended

155/80 R13

Ground line · Scaled comparison

Not Recommended

Over 5% — speedometer & ABS may misread

Diameter change

+31.0 mm

5.67%

Speedometer at 100

105.7 km/h

+5.67% error

Ground clearance

+15.5 mm

ride height delta

Sidewall change

+15.5 mm

revs/km: 550.5

Open visual comparisonCompare visually

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Detailed comparison

Metric	155/70 R13	155/80 R13	Difference
Overall diameter	547.2 mm	578.2 mm	+31.0 mm (+5.67%)
Sidewall height	108.5 mm	124.0 mm	+15.5 mm
Circumference	1.719 m	1.816 m	+97.4 mm
Revs / km	581.7	550.5	-31.2
Ground clearance	reference	+15.5 mm	+15.5 mm
Speedometer @ 100 km/h	100.0 km/h	105.7 km/h	+5.67 km/h

Verdict: danger

Over 5% diameter difference — likely to affect speedometer accuracy, ABS calibration and gearing. Not recommended without professional review.

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

155/80 R13

Profile: 80%
Circumference: 1.816 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

155/80 R13

Section width: 155 mm
Aspect ratio: 80%
Sidewall: 124.0 mm
Wheel diameter: 13″(330 mm)
Overall diameter: 578.2 mm(22.76″)
Circumference: 1.816 m
Revs / km: 550.5

Real-world consequences

Pros / cons

Taller sidewall (+10% aspect)

Sidewall

Plusher ride, better pothole and curb protection
More forgiving on bad roads and trails
Lower wheel-damage risk on impacts
More sidewall flex, softer steering feel
Slightly delayed turn-in response

Taller overall (+31.0 mm)

Rolling diameter

Higher ground clearance and approach angle
Longer effective gearing — calmer highway revs
Bigger contact patch lengthwise
Speedometer reads low by ~5.7%
Reduced fender, strut and bumpstop clearance
Slower 0-60, more downshifts under load

How it changes driving feel

Seat-of-the-pants

Steering response

Softer, slower

Ride comfort

Plusher ride

Road noise

Similar cabin noise

Wet / aquaplaning

Comparable wet behavior

Fuel economy

Small MPG penalty likely

Curb / pothole protection

More sidewall, more cushion

Fitment risk check

Verify before install

Speedometer drift

~5.7% diameter delta — speedo and ABS calibration likely affected.

ABS / ESP calibration

Outside factory tolerance — recalibration may be required for safety systems.

Cluster preview

Excessive drift

Speedometer impact

At a true 100 km/h, your dashboard will read 105.7 km/h after switching to 155/80 R13 — a +5.67% 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 +15.5 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

155/80 R13