Dunlop Grandtrek PT21 235/65R17 104H - 57000160

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What 235/65R17 means

In the size 235/65R17, 235 is the section width in millimeters (9.25 in), 65 is the aspect ratio — the sidewall stands 65% as tall as the tire is wide, or 152.8 mm (6.01 in) — R denotes radial construction, and 17 is the wheel diameter in inches. That works out to an overall diameter of about 29.03 inches, turning roughly 695 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 manufacturer lists the overall diameter of this specific tire as 29.25 inches — when clearance is tight, go by the published figure rather than the nominal size math.

The service description on this tire decodes to a load index of 104 — a maximum load of 1,984 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the Dunlop Grandtrek PT21?

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

What does 104H mean on the Dunlop Grandtrek PT21?

104H breaks down as load index 104 — rated for 1,984 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

What kind of tire is the Dunlop Grandtrek PT21?

The Dunlop Grandtrek PT21 in 235/65R17 is a all season tire.

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