2020 BMW i3 — S with Range Extender
The 2020 BMW i3 S with Range Extender shipped with 2 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
175/55R20 (Front)
| Section width | 175 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (96.3 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~27.6" |
| Revolutions per mile | ~731 |
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195/50R20 (Rear)
| Section width | 195 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (97.5 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~27.7" |
| Revolutions per mile | ~729 |
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What this size means for your BMW i3
On the 2020 BMW i3 S with Range Extender, the factory 175/55R20 measures about 27.6″ in overall diameter with a 96.3 mm (3.8″) sidewall, and completes roughly 731 revolutions per mile. Its 55-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a large-diameter fitment.
This is a staggered setup: the front axle runs 175/55R20 and the rear runs 195/50R20. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2020 BMW i3 trims
- Base Model 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- Base Model with Range Extender 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- S 175/55R20 (Front) / 195/50R20 (Rear)
BMW i3 tire sizes by year
- 2021 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- 2019 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- 2018 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- 2017 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- 2016 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- 2015 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- 2014 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.