OEM Safe
Within ±3%
Inside factory tolerance — ABS, ESP and cruise control stay calibrated.
Fitment comparison
185/55 R15versus175/70 R13
Δ Ø -9.3 mmSpeedo -1.59%OEM-safe
175/70 R13 is shorter than 185/55 R15 — quicker gearing feel, tighter arch gap, livelier throttle response.
175/70 R13 drops the rim from 15 to 13 inches versus 185/55 R15, trading wheel size for taller sidewall. This sizing approach moves rolling diameter a touch off the original spec. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
The speedometer offset is small but measurable; worth keeping in mind if you watch the dash closely. Diameter change stays inside the conservative ±3% safety window — an OEM-safe fitment on most vehicles.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick fitment verdict
185/55 R15 → 175/70 R13 at a glance
Fender Clearance
Clears fender
Width and diameter stay close to stock — arch clearance unchanged.
Speedometer Impact
-1.59%
At a true 100 km/h the dash reads 98.4 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
185/55 R15
- Diameter
- 584.5 mm
- Sidewall
- 101.8 mm
- Wheel
- 15″
- Width
- 185 mm
Δ delta
Ø -9.3 mm
SW +20.8 mm
RH -4.6 mm
NewNew
175/70 R13
- Diameter
- 575.2 mm
- Sidewall
- 122.5 mm
- Wheel
- 13″
- Width
- 175 mm
Real-world effects
How this swap actually feels
- Steering response23/100 · Softer turn-in
- Ride comfort97/100 · More cushion
- Fuel economy55/100 · Slightly lower drag
- Highway cruising54/100 · Higher cruise revs
- Pothole resistance96/100 · More wheel protection
Shareable card
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Export a garage-grade telemetry card of this comparison — perfect for forums, Reddit and Discord.
Ride height
Lower stance
Chassis drops — tighter arch gap, more aggressive stance.
New tire drops ride height by ~4.6 mm — tighter arch gap, lower stance.
Suspension travel · arch clearance
Wheel gap
Wheel sits closer to the fender
How the arch-to-tire gap reads from across the parking lot — the visual stance change everyone notices first.
185/55 R15
175/70 R13
Wheel-gap Δ-4.6 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 98.4 km/h
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 185/55 R15 → 175/70 R13 swap — steering, comfort, stance and dash behavior in plain enthusiast language.
Steering feel
+20.8 mm sidewallSofter, more relaxed turn-in
Taller sidewall flexes a touch more before loading the contact patch — calmer, comfort-tuned.
Ride firmness
55% → 70%Softer over potholes and joints
Bumps and expansion joints are absorbed better — a comfort win for daily driving.
Fender relationship
-10 mm widthFender gap reads near-identical
Width delta is too small to change stance — same visual signature as OEM.
Speedometer behavior
-1.59%OEM-safe speedometer reading
Inside the factory ±3% tolerance — ABS, ESP and cruise control behave as designed.
Daily drivability
Ø -9.3 mmLivable 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 175/70 R13 OEM-safe?
Yes. Overall diameter changes by -1.59% versus 185/55 R15. OEM-safe. Speedometer, ABS, ESP and gearing remain inside the factory tolerance.
Direct answer
Will 175/70 R13 rub?
Unlikely. Width changes by -10 mm and diameter by -9.3 mm. Very unlikely to rub with OEM wheel offset.
Direct answer
Does the speedometer change?
Yes — by -1.59%. Swapping 185/55 R15 for 175/70 R13 changes overall diameter, so at an indicated 100 km/h your true speed becomes 98.4 km/h. That's within the ±3% OEM tolerance — no recalibration needed.
Direct answer
Does lower sidewall affect comfort?
Yes — softer ride. Sidewall changes by +20.8 mm (55% → 70%). Ride softens and absorbs bumps better, with slightly less precise turn-in.
Current Tire
185/55R15
New Tire
175/70R13
Fitment · Scaled comparison
● Excellent fit
185/55 R15
Diameter
-9.3 mm
-1.59%
Sidewall
+20.8 mm
Speedometer
98.4 km/h
at true 100
Clearance
Excellent fit
175/70 R13
Ground line · Scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-9.3 mm
-1.59%
Speedometer at 100
98.4 km/h
-1.59% error
Ground clearance
-4.6 mm
ride height delta
Sidewall change
+20.8 mm
revs/km: 553.4
Permalink for this comparison:
/compare/185-55-r15-vs-175-70-r13Detailed comparison
| Metric | 185/55 R15 | 175/70 R13 | Difference |
|---|---|---|---|
| Overall diameter | 584.5 mm | 575.2 mm | -9.3 mm (-1.59%) |
| Sidewall height | 101.8 mm | 122.5 mm | +20.8 mm |
| Circumference | 1.836 m | 1.807 m | -29.2 mm |
| Revs / km | 544.6 | 553.4 | +8.8 |
| Ground clearance | reference | -4.6 mm | -4.6 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.4 km/h | -1.59 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
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
185/55 R15- Profile
- 55%
- Circumference
- 1.836 m
New
175/70 R13- Profile
- 70%
- Circumference
- 1.807 m
Side-by-side fitment
GeometryCurrent
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
New
175/70 R13- Section width
- 175 mm
- Aspect ratio
- 70%
- Sidewall
- 122.5 mm
- Wheel diameter
- 13″(330 mm)
- Overall diameter
- 575.2 mm(22.65″)
- Circumference
- 1.807 m
- Revs / km
- 553.4
Real-world consequences
Pros / consNarrower 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
Taller sidewall (+15% 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
Shorter overall (-9.3 mm)
Rolling diameter- Shorter effective gearing — perkier acceleration
- Lower center of gravity, sharper transitions
- More fender and arch clearance
- Speedometer reads high by ~1.6%
- Engine spins higher at cruise, small MPG hit
- ABS / ESP recalibration may be advisable
-2″ rim downsize
Wheel diameter- Cheaper winter / track tire sizing
- Lighter overall package, less unsprung mass
- More sidewall = more impact absorption
- Less aggressive stance
- Possible brake caliper clearance issue going too small
How it changes driving feel
Seat-of-the-pantsSteering response
Softer, slower
Ride comfort
Plusher ride
Road noise
Similar cabin noise
Wet / aquaplaning
Comparable wet behavior
Fuel economy
Negligible change
Curb / pothole protection
More sidewall, more cushion
Cluster preview
Within toleranceSpeedometer impact
At a true 100 km/h, your dashboard will read 98.4 km/h after switching to 175/70 R13 — a -1.59% 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 -4.6 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
185/55 R15
Back to
175/70 R13
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