Continental Spare Tire 135/70R18 103M - 03128620000

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What 135/70R18 means

In the size 135/70R18, 135 is the section width in millimeters (5.31 in), 70 is the aspect ratio — the sidewall stands 70% as tall as the tire is wide, or 94.5 mm (3.72 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 25.44 inches, turning roughly 793 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 103 — a maximum load of 1,929 lbs per tire. The speed symbol M corresponds to a maximum sustained speed of 81 mph.

Specifications

Frequently asked questions

Will 135/70R18 tires fit my vehicle?

Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 135/70R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right.

What does 103M mean on the Continental Spare Tire?

103M breaks down as load index 103 — rated for 1,929 lbs per tire — with an M speed rating, good for a maximum sustained 81 mph.

What kind of tire is the Continental Spare Tire?

The Continental Spare Tire in 135/70R18 is a all season tire.

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