What does the size ST175/80R13 mean?

Reading left to right: 175 is the section width in millimetres, 80 is the sidewall height as a percentage of that width, and the tire mounts on a 13-inch wheel. All three must match what your vehicle specifies.

How much weight can this tire carry?

Load index 97/93 means one tire is rated to carry up to 1,609 lbs at its recommended inflation pressure. Check the placard inside your driver’s door and never fit a lower index than it lists.

What does the L speed rating mean?

It certifies the tire for sustained speeds up to 75 mph under standard test conditions. Do not fit a rating below your vehicle’s original specification. Always drive within posted limits.

What is load range D?

Load range is the tire’s strength class, carried over from the old ply-rating system. This tire is D (8 ply), which determines how much weight it carries at a given inflation pressure.

Is this tire suitable for year-round use?

It is an all-season tire, built for dry, wet and light winter conditions. All-season tires are not a substitute for dedicated winter tires in severe snow or ice.

Does this tire have run-flat capability?

No. This is a standard tire, so a spare or repair kit is needed if you lose pressure.

Authentic Tire

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SizeST175/80R13

Rim13"

Load RangeD (8 ply)

Trailer master Pro ST175/80R13

Name: Trailer master Pro ST175/80R13
Brand: Trailer master
SKU: NAT-TRAILERMASTE-TMST15
Price: 61.88 USD
Availability: InStock

Price per tire

$61.88$70.99Save 13%

In stock

ST175/80R13 TRAILER MASTER ST PRO 97/93L 8PLY

Trailer master ST175/80R13 Commercial & Heavy Duty

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Your choiceDoor or installer

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Specifications

The full spec sheet

ModelThe manufacturer's name for this tread pattern. The same model in another size shares the same tread design and rubber compound.: PRO
Speed RatingA letter code for the highest sustained speed the tire is built to handle — T is 118 mph, H is 130, V is 149. Don't fit a rating lower than the one your vehicle came with.: L (Up to 75 mph)
Load IndexA code for the maximum weight one tire can carry at its recommended inflation pressure. Match or beat the index listed on your driver's-door sticker.: 97/93
Load RangeThe tire's strength class, carried over from the old ply-rating system. C, D and E carry progressively more weight at higher inflation pressures — you'll mostly see them on trucks and vans.: D (8 ply)
SeasonThe conditions the tread and rubber compound are designed for. All-season is the year-round default; winter tires stay flexible below 45°F; summer tires grip best in warm, dry weather and aren't made for snow.: All-Season
WeightWhat a single tire weighs. It doesn't change your price — delivery is quoted at checkout, not charged by weight.: 27 lbs
SidewallHow the lettering on the tire's outer wall is finished — blackwall, white letters, and so on. It's cosmetic and doesn't affect how the tire drives.: BW
Run FlatA reinforced sidewall that lets you keep driving a limited distance at reduced speed after losing air. Only fit these to a vehicle with tire-pressure monitoring.: No
Tire type: Trailer
Load index (single/dual): 97/93
Ply rating: 8-ply
WidthSection width in millimetres — the tire's width from sidewall to sidewall. It's the first number in a size like 225/65R17.: 175 mm
Aspect RatioThe sidewall height as a percentage of the section width — the second number in 225/65R17. A lower number means a shorter sidewall.: 80
Rim DiameterThe wheel diameter this tire mounts on, in inches. This one has to match your wheel exactly.: 13"
Part number: TMST15

Performance

Why this tire

Built specifically for trailer axles — not approved for steering or drive positions

All-season compound rated for dry, wet and light winter conditions

Load range D construction (8-ply rated) for higher load capacity at pressure

Load index 97/93 — rated to carry up to 1,609 lbs per tire

Speed rating L, certified for sustained speeds up to 75 mph

Special Trailer (ST) casing engineered for trailer service

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