Description
The SOUTHWEST WHEEL® Round R104BT8X BT8 Spindle, 5-4.5″ Bolt Circle Trailer Hub, & 8″ x 3.75″ White Trailer Wheel Combo (Part R1BT8BT122E-50844) is a complete, ready-to-install wheel, hub, and spindle assembly. This convenient combo includes a precision BT8 spindle, a pre-raced and pre-studded 5 on 4.5″ hub with Timken-style L44643 bearings, and a durable 8″ white wheel with Kenda Load Star tire — perfect for light-duty single axle trailers.
Round R104BT8X BT8 Spindle, 5-4.5″ Bolt Circle Trailer Hub, & 8″ x 3.75″ White Trailer Wheel Combo. 5 studs 4.5″ Bolt circle using L44643 inner and outer bearing hub. (BT8 Spindle 1 in.). Hubs are pre-raced & pre-studded with 1/2″-20 studs. Includes Hub, inner bearing, outer bearing, seal, grease cap & lug nuts. BT8 Spindle, Spindle vase size=1 1/4″ Spindle length=3 3/8″ Overall length =8 1/4″ Capacity (pair) 1,000 lbs. 8″ X 3.75″, 5 lug 4.5″ Bolt Circle, White Trailer Wheel, 2.75″ Center Bore, Tire Size: 4.80/4.00-8, Four Ply, 585 lbs. capacity, 16.1″ Outside Diameter, 4.6″ Side Wall, 60 Max PSI. Kenda Load Star Tire. TruRyde hubs and spindles.
Key Features
- Part Number: R1BT8BT122E-50844
- Brand: Southwest Wheel® / TruRyde®
- Spindle: Round R104BT8X BT8 (1″ spindle, 1-1/4″ base)
- Spindle Dimensions: Length 3-3/8″, Overall 8-1/4″
- Hub: 5 on 4.5″ Bolt Circle with 1/2″-20 Studs
- Bearings: L44643 Inner & Outer
- Wheel: 8″ x 3.75″ White, 5 Lug, 2.75″ Center Bore
- Tire: Kenda Load Star 4.80/4.00-8 (4-Ply, 585 lbs. capacity)
- Capacity: 1,000 lbs. (Pair)
- Contents: Spindle, Hub with Bearings & Seal, Grease Cap, Lug Nuts
Ideal for small utility trailers, cargo trailers, boat trailers, ATV trailers, and other light-duty single axle applications up to 1,000 lbs. per pair.
Questions about this Southwest Wheel combo or compatibility? Call our trailer experts at 1-800-866-3336.
Browse more Trailer Axles & Suspension Kits.
| Part No | Quantity | Description |
| X1023R | 5 | Nut, Cone 60-Deg |
| RVI-BT-5450 | 1 | Hub, 2K, 545, Cupped & Studded |
| GS-1250DLR | 1 | Seal, Grease 1.25 ID |
| DC-200 | 1 | Grease Cap |
| L-44643 | 2 | Bearing Cone (L44643) |
| R104BT8 | 1 | 1.25″ Round BT8 Spindle |
| FS-SN100 | 1 | 1″ Spindle Nut |
| FA-SW100 | 1 | 1″ Spindle Washer |
| 18X134CP | 1 | Cotter Pin |
| 50844 | 1 | 4.80-8 LoadStar 5-4.5″ Wheel and Tire |








