2018 Lexus GS — 350
The 2018 Lexus GS 350 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.
235/45R18
| Section width | 235 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (105.8 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~26.3" |
| Revolutions per mile | ~766 |
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235/40R19
| Section width | 235 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (94 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~26.4" |
| Revolutions per mile | ~764 |
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What this size means for your Lexus GS
On the 2018 Lexus GS 350, the factory 235/45R18 measures about 26.3″ in overall diameter with a 105.8 mm (4.2″) sidewall, and completes roughly 766 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 235/45R18 and 235/40R19 roll within 0.1″ (0.4%) 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 2018 Lexus GS trims
- 300 235/50R17 / 235/45R18
- 300 F Sport 235/40R19 (Front) / 265/35R19 (Rear)
- 350 F Sport 235/40R19 (Front) / 265/35R19 (Rear)
- 350 F Sport AWD 235/40R19
- 450h 235/45R18
- 450h F Sport 235/40R19 (Front) / 265/35R19 (Rear)
- F 255/35R19 (Front) / 275/35R19 (Rear)
Lexus GS tire sizes by year
- 2020 Lexus GS 235/45R18 / 235/40R19
- 2019 Lexus GS 235/50R17 / 235/45R18
- 2017 Lexus GS 235/45R18
- 2016 Lexus GS 235/50R17 / 235/45R18
- 2015 Lexus GS 225/50R17 / 235/45R18
- 2014 Lexus GS 225/50R17 / 235/45R18
- 2013 Lexus GS 225/50R17 / 235/45R18
- 2012 Lexus GS 225/50R17
- 2011 Lexus GS 225/50R17
- 2010 Lexus GS 225/50R17
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.