General Tire GEN G-MAX RS 255/40ZR19XL

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What 255/40R19 means

In the size 255/40R19, 255 is the section width in millimeters (10.04 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 102.0 mm (4.02 in) — R denotes radial construction, and 19 is the wheel diameter in inches. That works out to an overall diameter of about 27.03 inches, turning roughly 746 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.

The service description on this tire decodes to a load index of 100 — a maximum load of 1,764 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the General Tire G-MAX RS?

This tire carries a treadwear grade of 360, traction grade AA, temperature grade A under UTQG.

What does 100Y mean on the General Tire G-MAX RS?

100Y breaks down as load index 100 — rated for 1,764 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.

What kind of tire is the General Tire G-MAX RS?

The General Tire G-MAX RS in 255/40R19 is a high performance tire.

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