2008 Honda Civic — Coupe Si
The 2008 Honda Civic Coupe Si 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.
215/45R17
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (96.8 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~24.6" |
| Revolutions per mile | ~819 |
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215/40R18
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (86 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~24.8" |
| Revolutions per mile | ~814 |
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What this size means for your Honda Civic
On the 2008 Honda Civic Coupe Si, the factory 215/45R17 measures about 24.6″ in overall diameter with a 96.8 mm (3.8″) sidewall, and completes roughly 819 revolutions per mile. Its 45-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a passenger (P-metric / Euro-metric) size.
The 215/45R17 and 215/40R18 roll within 0.2″ (0.8%) 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.
On a vehicle of this age, the Honda Civic may have been refitted with a slightly different replacement size somewhere in its life, so check the current sidewall — not just the factory spec — before buying.
Other 2008 Honda Civic trims
- Coupe DX 195/65R15
- Coupe EX 205/55R16 / 215/45R17
- Coupe EX-L 205/55R16 / 215/45R17
- Coupe LX 205/55R16 / 215/45R17
- Sedan DX 195/65R15
- Sedan EX 205/55R16 / 215/45R17
- Sedan EX-L 205/55R16 / 215/45R17
- Sedan GX 195/65R15
- Sedan Hybrid 195/65R15
- Sedan LX 205/55R16 / 215/45R17
- Sedan MUGEN Si 215/40R18
- Sedan Si 215/45R17 / 215/40R18
Honda Civic tire sizes by year
- 2026 Honda Civic 235/40R18
- 2025 Honda Civic 235/40R18
- 2024 Honda Civic 215/50R17
- 2023 Honda Civic 215/50R17
- 2022 Honda Civic 215/50R17
- 2021 Honda Civic 215/50R17
- 2020 Honda Civic 215/50R17
- 2019 Honda Civic 215/50R17
- 2018 Honda Civic 215/50R17
- 2017 Honda Civic 215/50R17
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.