2008 Chevrolet Avalanche — Z71
The 2008 Chevrolet Avalanche Z71 came from the factory equipped with 265/65R18 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.
265/65R18
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 65% (172.3 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~31.6" |
| Revolutions per mile | ~639 |
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What this size means for your Chevrolet Avalanche
On the 2008 Chevrolet Avalanche Z71, the factory 265/65R18 measures about 31.6″ in overall diameter with a 172.3 mm (6.8″) sidewall, and completes roughly 639 revolutions per mile. Its 65-series aspect ratio gives a taller, comfort-biased sidewall that favors ride quality and shrugs off rough pavement. In tire terms it is a passenger (P-metric / Euro-metric) size.
On a vehicle of this age, the Chevrolet Avalanche 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 Chevrolet Avalanche trims
Chevrolet Avalanche tire sizes by year
- 2013 Chevrolet Avalanche 265/70R17 / 275/55R20
- 2012 Chevrolet Avalanche 265/70R17 / 275/55R20
- 2011 Chevrolet Avalanche 265/70R17 / 275/55R20
- 2010 Chevrolet Avalanche 265/70R17 / 275/55R20
- 2009 Chevrolet Avalanche 265/70R17
- 2007 Chevrolet Avalanche 265/70R17
- 2006 Chevrolet Avalanche 245/75R16
- 2005 Chevrolet Avalanche 245/75R16
- 2004 Chevrolet Avalanche 245/75R16
- 2003 Chevrolet Avalanche 245/75R16
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.