1999 GMC Jimmy — Envoy

The 1999 GMC Jimmy Envoy came from the factory equipped with 235/70R15 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.

235/70R15

Section width235 mm
Aspect ratio (sidewall height)70% (164.5 mm)
Rim diameter15"
Overall tire diameter~28"
Revolutions per mile~722

Compare prices at:

What this size means for your GMC Jimmy

On the 1999 GMC Jimmy Envoy, the factory 235/70R15 measures about 28″ in overall diameter with a 164.5 mm (6.5″) sidewall, and completes roughly 722 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.

On a vehicle of this age, the GMC Jimmy 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 1999 GMC Jimmy trims

GMC Jimmy tire sizes by year

See every GMC Jimmy year & trim →

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.