Comparison
255/35 R21 vs 275/40 R19
Switching from 255/35 R21 to 275/40 R19 steps down to a 19-inch wheel — a familiar move for winter and dedicated all-terrain sets. This alternative fitment barely shifts the rolling circumference. Extra sidewall absorbs impacts more readily — a sensible bias for daily commuting and broken pavement.
The speedometer offset is mild and well inside what most cars can tolerate without recalibration. Overall the swap sits inside the safe ±3% diameter window, so ABS, traction control and gearing behave normally.
TakeTypical choice for a dedicated winter or off-road setup where extra sidewall pays off.
Quick math: 275/40 R19 is 9.3 mm shorter than 255/35 R21, shifting the speedometer by -1.31%.
Current Tire
New Tire
Ground line · scaled comparison
Excellent Fit
Within ±3% — safe for daily driving
Diameter change
-9.3 mm
-1.31%
Speedometer at 100
98.7 km/h
-1.31% error
Ground clearance
-4.7 mm
ride height delta
Sidewall change
+20.8 mm
revs/km: 453.0
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/compare/255-35-r21-vs-275-40-r19Detailed comparison
| Metric | 255/35 R21 | 275/40 R19 | Difference |
|---|---|---|---|
| Overall diameter | 711.9 mm | 702.6 mm | -9.3 mm (-1.31%) |
| Sidewall height | 89.3 mm | 110.0 mm | +20.8 mm |
| Circumference | 2.236 m | 2.207 m | -29.2 mm |
| Revs / km | 447.1 | 453.0 | +5.9 |
| Ground clearance | reference | -4.7 mm | -4.7 mm |
| Speedometer @ 100 km/h | 100.0 km/h | 98.7 km/h | -1.31 km/h |
Verdict: excellent
Within ±3% — speedometer, ABS and traction control should behave normally.
Speedometer impact
At a true 100 km/h, your dashboard will read 98.7 km/h after switching to 275/40 R19 — a -1.31% offset. Use the speedometer error calculator to recheck for other indicated speeds, and the speedometer error guide for the full background.
Ground clearance change
The new tire's half-diameter changes ride height by -4.7 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
255/35 R21
Back to
275/40 R19
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