Choose 13-inch trailer wheels by matching bolt pattern, load rating, rim width, center bore, and offset to your trailer’s hub and tires.
For the full breakdown, see our best 13 Inch Trailer Wheels guide.
Choosing the right 13-inch trailer wheels comes down to five measurements, not brand names or looks. Get the bolt pattern wrong and the wheel won’t mount at all. Get the load rating wrong and a fully loaded trailer becomes a safety risk at highway speed. The good news: the specs are easy to check, and the most common US trailer setup follows a narrow set of standards. The bolt pattern must equal your hub’s exactly, the load rating must meet or beat the tire’s capacity and your trailer’s GVWR, and the rim width, center bore, and offset must suit the tire and clear the brakes and fenders.
What Specs Decide Whether A 13-Inch Wheel Fits
Five specifications decide whether a 13-inch trailer wheel fits your trailer safely: bolt pattern, load rating, rim width, center bore, and offset. Work through them in order, and you can size a wheel from a spec sheet alone.
Bolt pattern. This one is non-negotiable. The wheel’s lug count and bolt circle must match the hub exactly — no adapter or workaround exists for a mismatched pattern. Common 13-inch patterns on US trailers are 5 on 4-1/2, 4 on 4, and 5 on 4.5. Measure your hub’s bolt circle before ordering anything.
Load rating. The wheel’s rated capacity must meet or exceed both the tire’s load capacity and the trailer’s GVWR. Trailer tires print their load range on the sidewall, and that marking indicates the maximum weight the tire can safely support. Never mount a tire rated for more weight than the wheel can handle.
Rim width and diameter. The wheel must be sized to the tire. Most 13-inch trailer tires use the alpha-numeric format — ST175/80R13 or ST175/80D13 — designed for a 13-inch wheel about 4.5 inches wide. Check the tire maker’s approved rim-width range before pairing them.
Center bore and offset. The pilot diameter centers the wheel on the hub, and the offset sets where it sits in the fender opening. A wheel that seats wrong vibrates and wears unevenly even when it bolts on.
Common 13-Inch Trailer Wheel Specs
Most US 13-inch trailer wheel and tire packages share a small set of reference specs. The table below lists the typical values and why each one matters when you’re matching parts.
| Specification | Typical Value | Why It Matters |
|---|---|---|
| Wheel diameter | 13 in | Must match the tire’s rim size |
| Rim width | 4-1/2 in | Must sit inside the tire’s approved rim-width range |
| Bolt pattern | 5 on 4-1/2 (also 4 on 4, 5 on 4.5) | Must equal the hub pattern exactly |
| Wheel bolt size | 1/2″-20 | Determines the correct lug nuts |
| Center bore (pilot) | 3.19 in | Centers the wheel on the hub |
| Offset | 0 | Keeps the tire centered and clear of fenders |
| Load Range C assembly | 1,360 lb | Typical capacity for ST175/80R13 packages |
| Load Range D assembly | 1,660 lb | Heavier-duty option for bigger loads |
If you’re replacing all four wheels, confirm the specs against your current hub and the trailer’s GVWR sticker instead of assuming the common pattern is yours.
Common Mistakes To Avoid
Most 13-inch trailer wheel problems trace back to four repeat mistakes. Avoid them and the odds of a smooth install go way up.
- Buying by tire diameter alone. A 13-inch tire doesn’t fit every 13-inch wheel — rim width, bolt pattern, and center bore all have to line up.
- Confusing 5 on 4.5 with other 5-lug patterns. The bolt circle measurement is what separates them, and 5 on 4.5 and 5 on 5 look similar at a glance.
- Undersizing the load rating. The wheel’s capacity must equal or exceed the tire’s capacity, and both need to suit the trailer’s GVWR.
- Skipping pilot and offset checks. A wheel that doesn’t seat on the hub properly can vibrate and cause uneven wear even with the right bolt pattern.
When your bolt pattern and load range are confirmed, a tested lineup of 13-inch trailer wheels shows what’s worth buying for your setup.
FAQs
What bolt pattern fits most 13-inch trailer wheels?
The most common 13-inch trailer wheel package in the US uses a 5 on 4-1/2 bolt pattern, but 4 on 4 and 5 on 4.5 patterns also show up in vendor size charts. The only pattern that fits your trailer is the one matching your hub exactly, so measure the bolt circle before ordering.
Can I put ST175/80R13 tires on any 13-inch wheel?
No. The tire has to be mounted on a wheel inside its approved rim-width range, and the wheel’s load rating must meet or exceed the tire’s load capacity. ST175/80R13 tires are typically paired with 13 x 4.5-inch wheels in the correct load range.
How much weight can 13-inch trailer wheels carry?
The right pick depends on your trailer’s GVWR and tire ratings.
References & Sources
- Peregrine Inc. “Wheel Specifications.” Details wheel dimensions, bolt patterns, pilot diameters, and load ratings for 13-inch trailer wheels.