Ohtsu OHTS FP7000 255/45R18

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What 255/45R18 means

In the size 255/45R18, 255 is the section width in millimeters (10.04 in), 45 is the aspect ratio — the sidewall stands 45% as tall as the tire is wide, or 114.8 mm (4.52 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 27.04 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 manufacturer lists the overall diameter of this specific tire as 18 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 99 — a maximum load of 1,709 lbs per tire. The speed symbol W corresponds to a maximum sustained speed of 168 mph.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the Ohtsu FP7000?

This tire carries a treadwear grade of 440, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 40K.

What does 99W mean on the Ohtsu FP7000?

99W breaks down as load index 99 — rated for 1,709 lbs per tire — with a W speed rating, good for a maximum sustained 168 mph.

What kind of tire is the Ohtsu FP7000?

The Ohtsu FP7000 in 255/45R18 is a high-performance tire.

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