Milestar MIL Streetsteel 255/70R15/4

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What 255/70R15 means

In the size 255/70R15, 255 is the section width in millimeters (10.04 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 178.5 mm (7.03 in) — R denotes radial construction, and 15 is the wheel diameter in inches. That works out to an overall diameter of about 29.06 inches, turning roughly 694 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 15 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 108 — a maximum load of 2,205 lbs per tire. The speed symbol T corresponds to a maximum sustained speed of 118 mph.

Specifications

Frequently asked questions

What are the treadwear and warranty ratings on the Milestar Streetsteel?

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

What does 108T mean on the Milestar Streetsteel?

108T breaks down as load index 108 — rated for 2,205 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.

What kind of tire is the Milestar Streetsteel?

The Milestar Streetsteel in 255/70R15 is a touring tire.

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