Kumho Solus KL21 255/65R18 109H - 2137743

The Kumho Solus KL21 in 255/65R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.

What 255/65R18 means

In the size 255/65R18, 255 is the section width in millimeters (10.04 in), 65 is the aspect ratio — the sidewall stands 65% as tall as the tire is wide, or 165.8 mm (6.53 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 31.05 inches, turning roughly 650 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 29.52 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 109 — a maximum load of 2,271 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.

Specifications

Frequently asked questions

What does 109H mean on the Kumho Solus KL21?

109H breaks down as load index 109 — rated for 2,271 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.

What kind of tire is the Kumho Solus KL21?

The Kumho Solus KL21 in 255/65R18 is a all season tire.

What are the treadwear and warranty ratings on the Kumho Solus KL21?

This tire carries a treadwear grade of 500, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 60K.

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