OEM Safe
Out of spec
Beyond OEM tolerance — speedometer and ABS need professional review.
Fitment comparison
155/70 R13versus185/55 R15
Δ Ø +37.3 mmSpeedo +6.82%Aggressive
185/55 R15 stands taller than 155/70 R13 — bigger rolling diameter, slightly more clearance, calmer cruise revs.
Plus-sizing from 155/70 R13 to 185/55 R15 keeps overall diameter close to factory while opening room for a larger 15-inch wheel. This wheel and tire pairing noticeably changes overall diameter compared to OEM.
The dashboard speed will be significantly off — plan on recalibration before daily use. Expect a more planted steering feel, at the cost of some of the cushioning a taller sidewall provides. More tread on the ground tends to improve dry grip and stance, with a small fuel-economy and clearance tradeoff. Visually, the bigger wheel fills the arch and gives the car a more aggressive stance. 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 → 185/55 R15 at a glance
Fender Clearance
Likely rubs
Significantly wider/taller — rubbing risk on liners or fender lip is real.
Speedometer Impact
+6.82%
Dash reads 106.8 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 +37.3 mm
SW -6.8 mm
RH +18.6 mm
NewNew
185/55 R15
- Diameter
- 584.5 mm
- Sidewall
- 101.8 mm
- Wheel
- 15″
- Width
- 185 mm
Real-world effects
How this swap actually feels
- Steering response71/100 · Sharper turn-in
- Ride comfort49/100 · Firmer ride
- Fuel economy23/100 · Slightly higher drag
- Highway cruising82/100 · Lower cruise revs
- Pothole resistance43/100 · Less wheel protection
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Ride height
Lifted stance
Chassis sits higher — slightly more clearance, wheel-gap visually grows.
New tire lifts the chassis by ~18.6 mm — more clearance, slightly more wheel-gap.
Suspension travel · arch clearance
Wheel gap
Wheel gap visually increases
How the arch-to-tire gap reads from across the parking lot — the visual stance change everyone notices first.
155/70 R13
185/55 R15
Wheel-gap Δ+18.6 mm
Static · unloaded chassis
Fender relationship
Tucked · Flush · Poke
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 106.8 km/h
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 → 185/55 R15 swap — steering, comfort, stance and dash behavior in plain enthusiast language.
Steering feel
-6.8 mm sidewallSharper steering response
Shorter sidewall transmits inputs faster — quicker turn-in, more confident on-center feel.
Ride firmness
70% → 55%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
+30 mm widthWheel sits closer to the fender
Wider tire pushes the contact patch outboard — flusher stance, but verify fender lip clearance at full lock.
Speedometer behavior
+6.82%Out of tolerance — recalibrate
Beyond ±5% — speedometer, gearing and ABS calibration all need a professional review.
Daily drivability
Ø +37.3 mmAggressive setup — verify before daily use
Geometry deviates enough to matter — check clearance, recalibrate the dash, then re-evaluate.
Direct answer
Is 185/55 R15 OEM-safe?
No. Overall diameter changes by +6.82% versus 155/70 R13. Not OEM-safe. Overall diameter strays beyond ±5% — recalibration and clearance review are required.
Direct answer
Will 185/55 R15 rub?
Possibly. Width changes by +30 mm and diameter by +37.3 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 +6.82%. Swapping 155/70 R13 for 185/55 R15 changes overall diameter, so at an indicated 100 km/h your true speed becomes 106.8 km/h. That's outside safe tolerance — recalibrate.
Direct answer
Does lower sidewall affect comfort?
Yes — firmer ride. Sidewall changes by -6.8 mm (70% → 55%). Ride becomes firmer and steering sharper, but potholes and expansion joints hit harder and wheel damage risk rises.
Current Tire
155/70R13
New Tire
185/55R15
Fitment · Scaled comparison
● Not recommended
155/70 R13
Diameter
+37.3 mm
+6.82%
Sidewall
-6.8 mm
Speedometer
106.8 km/h
at true 100
Clearance
Not recommended
185/55 R15
Ground line · Scaled comparison
Not Recommended
Over 5% — speedometer & ABS may misread
Diameter change
+37.3 mm
6.82%
Speedometer at 100
106.8 km/h
+6.82% error
Ground clearance
+18.6 mm
ride height delta
Sidewall change
-6.8 mm
revs/km: 544.6
Permalink for this comparison:
/compare/155-70-r13-vs-185-55-r15Detailed comparison
| Metric | 155/70 R13 | 185/55 R15 | Difference |
|---|---|---|---|
| Overall diameter | 547.2 mm | 584.5 mm | +37.3 mm (+6.82%) |
| Sidewall height | 108.5 mm | 101.8 mm | -6.8 mm |
| Circumference | 1.719 m | 1.836 m | +117.2 mm |
| Revs / km | 581.7 | 544.6 | -37.1 |
| Ground clearance | reference | +18.6 mm | +18.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 106.8 km/h | +6.82 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-sideScaled 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
185/55 R15- Profile
- 55%
- Circumference
- 1.836 m
Side-by-side fitment
GeometryCurrent
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
185/55 R15- Section width
- 185 mm
- Aspect ratio
- 55%
- Sidewall
- 101.8 mm
- Wheel diameter
- 15″(381 mm)
- Overall diameter
- 584.5 mm(23.01″)
- Circumference
- 1.836 m
- Revs / km
- 544.6
Real-world consequences
Pros / consWider tire (+30 mm)
Section width- More dry grip and cornering bite
- Sharper steering response on initial turn-in
- Bigger contact patch under braking
- More road noise on coarse asphalt
- Worse aquaplaning resistance in standing water
- Higher rolling resistance, small MPG hit
- Possible fender or strut contact at full lock
Lower profile (-15% aspect)
Sidewall- Sharper turn-in and less sidewall roll
- More planted on smooth tarmac
- Bigger brake / caliper visual real estate
- Harsher ride over expansion joints and potholes
- Higher wheel-damage risk on impacts
- Less curb protection for the rim lip
- More sensitive to correct tire pressure
Taller overall (+37.3 mm)
Rolling diameter- Higher ground clearance and approach angle
- Longer effective gearing — calmer highway revs
- Bigger contact patch lengthwise
- Speedometer reads low by ~6.8%
- Reduced fender, strut and bumpstop clearance
- Slower 0-60, more downshifts under load
+2″ rim upsize
Wheel diameter- OEM+ look, fills the arch better
- Sharper response with matching low-profile rubber
- Bigger brake clearance for upgrades
- Heavier wheel, more unsprung mass
- Harsher ride, more wheel-damage risk
- Tire and wheel cost both go up
How it changes driving feel
Seat-of-the-pantsSteering response
Sharper turn-in
Ride comfort
Harsher impacts
Road noise
Louder on coarse asphalt
Wet / aquaplaning
Reduced standing-water margin
Fuel economy
Small MPG penalty likely
Curb / pothole protection
Higher wheel-damage risk
Fitment risk check
Verify before installFender rubbing
Width jump >20 mm — verify fender lip and inner liner clearance at full lock.
Suspension clearance
Wider tire may contact strut or control arm on full compression.
Speedometer drift
~6.8% diameter delta — speedo and ABS calibration likely affected.
ABS / ESP calibration
Outside factory tolerance — recalibration may be required for safety systems.
Cluster preview
Excessive driftSpeedometer impact
At a true 100 km/h, your dashboard will read 106.8 km/h after switching to 185/55 R15 — a +6.82% 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 +18.6 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
185/55 R15
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