2015 BMW i3 — Mega World
The 2015 BMW i3 Mega World shipped with 3 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.
155/70R19
| Section width | 155 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (108.5 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~27.5" |
| Revolutions per mile | ~732 |
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155/60R20 (Front)
| Section width | 155 mm |
|---|---|
| Aspect ratio (sidewall height) | 60% (93 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~27.3" |
| Revolutions per mile | ~738 |
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175/55R20 (Rear)
| Section width | 175 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (96.3 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~27.6" |
| Revolutions per mile | ~731 |
Compare prices at:
What this size means for your BMW i3
On the 2015 BMW i3 Mega World, the factory 155/70R19 measures about 27.5″ in overall diameter with a 108.5 mm (4.3″) sidewall, and completes roughly 732 revolutions per mile. Its 70-series aspect ratio gives a tall sidewall of the kind used on trucks, SUVs, and older passenger cars, built for cushioning and load. In tire terms it is a passenger (P-metric / Euro-metric) size.
The 155/70R19 and 155/60R20 roll within 0.2″ (0.7%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.
Other 2015 BMW i3 trims
- Giga World 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- Giga World with Range Extender 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- Mega World with Range Extender 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- Tera World 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- Tera World with Range Extender 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
BMW i3 tire sizes by year
- 2021 BMW i3 155/70R19 (Front) / 175/60R19 (Rear) / 155/60R20 (Front) / 175/55R20 (Rear)
- 2020 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)
- 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.