What Does BSW Mean on Tires? Black Sidewall, OWL, and Sidewall Codes

Published: Jun 2, 2020

Updated: Jun 11, 2026

By Kelley Crush

What Does BSW Mean on Tires? Black Sidewall, OWL, and Sidewall Codes

BSW means black sidewall. On a BSW tire, the sidewall lettering and numbers are molded in black instead of painted or raised in white. It is mostly an appearance code, but it matters when you are ordering tires online and want the truck to have a clean, all-black sidewall instead of white lettering facing out.

Do not stop at the sidewall color code, though. The same tire listing can also include size, load index, load range, speed rating, DOT date code, and service-type markings. Those codes decide whether the tire fits the truck and can carry the load. BSW just tells you what the visible sidewall usually looks like.

Key Takeaways

BSW means black sidewall: black letters and numbers on a black tire sidewall.
OWL usually means outlined white letters; RWL usually means raised white letters.
Some tires have white lettering on one side and black lettering on the other, so the installer can mount the side you want facing out.
Check tire size and load rating before appearance codes, especially on pickups that tow, carry tools, run a topper, or haul winter ballast.
Read the DOT date code before buying old stock or used tires; tire age matters even if the tread looks decent.

Quick Answer

If a tire listing says BSW, expect a plain black sidewall. If it says OWL, expect outlined white letters. If it says RWL, expect raised white letters. Some retailers and manufacturers use slightly different wording, so product photos are useful, but the sidewall code is the better clue when photos are generic.

For a pickup owner, BSW is usually the quieter-looking choice. It does not make the tire stronger, softer, safer, or better in snow. A BSW highway tire and an OWL all-terrain tire can be totally different tires underneath, so sort by fitment first and sidewall appearance second.

Code	Common Meaning	What It Changes
BSW	Black sidewall	Mostly appearance
BW	Blackwall	Mostly appearance
OWL	Outlined white letters	Mostly appearance
RWL	Raised white letters	Mostly appearance
WSW	White sidewall	Mostly appearance, common on classic-style tires

Check These Before You Care About BSW

The sidewall look is the fun part. The boring part is what keeps a truck from feeling wrong after the tires go on.

Before choosing BSW or white letters, check:

Pre-check	Where to Look	Why It Matters
Factory tire size	Driver-side door label and owner’s manual	Keeps the tire close to the truck’s intended fitment
Load rating	Door label, tire sidewall, and manufacturer specs	Protects payload, towing, and heavy accessory use
Wheel diameter	Tire size and wheel size	An 18-inch tire will not fit a 17-inch wheel
Intended use	Your actual roads, towing, cargo, and weather	Prevents buying an aggressive tire just for looks
Tire age	DOT/TIN date code on the sidewall	Helps avoid old stock or questionable used tires

NHTSA tells shoppers to use the owner’s manual or Tire and Loading Information label on the driver’s side door edge or post to find the correct tire size for a car or truck: NHTSA TireWise tire-buying guidance.

BSW vs. OWL: Which One Should Face Out?

Many truck tires are built with different styling on each side. One side may have black lettering, while the other has outlined or raised white lettering. In that case, the installer can mount the tire with either side facing outward.

Choose BSW facing out if you want the tire to disappear visually and let the wheel, stance, or truck color do the talking. It also hides curb scuffs and brake dust better than white lettering.

Choose OWL or RWL facing out if you want an older-school off-road look. White letters can look good on a square-body truck, a classic 4x4, or a modern pickup with a throwback build, but they are more obvious when dirty or unevenly scrubbed.

If you are ordering online, do not assume the product photo is the exact sidewall you will receive. Retailers often reuse tire images across many sizes. Check the selected size row and look for BSW, BW, OWL, RWL, or a similar sidewall note.

Where BSW Shows Up In A Tire Listing

BSW usually appears near the tire size and service description. A listing might look something like this:

LT275/70R18 125/122S Load Range E BSW

That line is doing several jobs:

Code Piece	Plain Meaning	Why It Matters
LT	Light Truck service type	Often used for heavier-duty pickup tires
275	Section width in millimeters	Affects clearance and fitment
70	Aspect ratio	Sidewall height is 70 percent of section width
R	Radial construction	Normal for modern truck tires
18	Wheel diameter in inches	Must match the wheel
125/122	Load index for single/dual fitments	Tells you load capacity through a chart
S	Speed rating	Must suit vehicle use
Load Range E	Heavy-duty LT load range	Common on towing and work-truck tires
BSW	Black sidewall	Appearance code

BFGoodrich’s tire-sidewall guide breaks down the main sidewall fields, including tire type, width, aspect ratio, construction, wheel diameter, load index, and speed rating: BFGoodrich sidewall code guide.

What SL, XL, and LT Mean Near BSW

The old question often appears as “What does SL BSW mean on a tire?” That combines two different ideas.

SL usually means Standard Load on passenger-metric tires. It is a load category, not a sidewall color. XL means Extra Load. LL can mean Light Load. These markings are most common on passenger-style tires, not heavy-duty LT tires.

LT means Light Truck. LT tires often use load range letters such as C, D, E, or F instead of the SL/XL wording truck owners see on many passenger-metric tires. An LT tire can be the right choice for towing, hauling, and rough service, but it may ride firmer and need different inflation pressure than a P-metric tire.

So:

Marking	Type of Information	Plain Meaning
SL	Load category	Standard Load passenger-metric tire
XL	Load category	Extra Load passenger-metric tire
LT	Service type	Light Truck tire
BSW	Appearance	Black sidewall

DOT Date Code: The Sidewall Check People Skip

Sidewall appearance is easy to notice. Tire age is easier to miss.

Look for the DOT Tire Identification Number on the sidewall. The date portion is usually the final four digits. The first two digits are the week of manufacture, and the last two digits are the year. For example, 2325 means the tire was made in the 23rd week of 2025.

That date code matters when you are buying used tires, closeout tires, or old stock from a small shop. Rubber changes with age, heat, sunlight, storage, and use. If the tire is old enough to make you hesitate, ask for a fresher tire or check the tire maker’s age guidance before buying.

The DOT code also helps with recalls. NHTSA points drivers to tire recall checks and explains that tire problems can be tracked through tire identification information: NHTSA TireWise recall resources.

What Changes When You Upsize Wheels

Bigger wheels and tires can change how the truck drives, even when the sidewall letters are the least interesting part of the tire.

If you increase overall tire diameter, the tire travels farther with each rotation. That can change speedometer accuracy, effective gearing, acceleration feel, transmission behavior, and braking demand. Bigger tires can also be heavier, which matters more on a truck that already tows or carries payload.

If you only increase wheel diameter but keep the same overall tire diameter, you usually get a shorter sidewall. That can sharpen steering feel a little, but it can also make the ride harsher and reduce the cushion you want on washboard roads, potholes, job sites, or rocky trails.

For a deeper setup check, use our pickup truck tire basics guide and the make-specific speedometer calibration guides for Chevy and GMC trucks, Ford F-150, and Ram trucks.

Examples: Modern All-Terrain Tires With Sidewall Choices

This is not a product ranking. These are useful examples because popular truck tires often come in many sizes, load ratings, and sidewall styles.

The Falken Wildpeak A/T4W is a current all-terrain example with LT and heavy-duty sizes in the lineup. Falken lists features such as select-size 3-ply sidewall construction and updated towing-focused construction, so it is a good reminder that one tire family can include several sizes and load configurations.

The BFGoodrich All-Terrain T/A KO3 is another current all-terrain example. BFGoodrich positions it for trucks, SUVs, and off-road use, but the exact size, load rating, and sidewall treatment still need to be checked before buying.

With either tire, choose the size and load spec first. Then choose whether BSW, OWL, or another sidewall style fits the look of the truck.

FAQ

Does BSW mean the tire is lower quality?

No. BSW only describes the sidewall appearance. A black-sidewall tire can be basic, premium, highway-focused, all-terrain, mud-terrain, P-metric, or LT. Judge the tire by its fitment, load rating, construction, traction needs, and manufacturer specs.

Is BSW better than white lettering?

Not mechanically. BSW looks cleaner and hides grime better. White lettering stands out more and can give a truck a classic off-road look. The better choice is the one that matches your truck and is available in the correct size and load rating.

Can I mount white-letter tires with the black side facing out?

Often, yes, if the tire has white lettering on only one side. Ask the installer before mounting. Some tires are directional or asymmetric, and those have mounting rules that matter more than appearance.

What does SL BSW mean?

SL means Standard Load. BSW means black sidewall. Together, the listing is telling you the tire’s load category and sidewall appearance. It does not tell you by itself whether the tire is correct for a specific pickup.

Should I buy tires based on the DOT date?

Use the DOT date as a screening check, not the only decision. A fresh tire in the wrong size is still wrong, and an older tire with visible cracking or unknown storage history is not a bargain. Check size, load rating, condition, and age together.

Written by

Kelley Crush

Kelley is a mechanical engineer and a truck enthusiast. He's currently an F-250 guy, but he promises to respect any well-equipped and properly utilized truck.

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