Overview
The Spidertrax Offroad Ultimate Unit Bearing, part number FUBR65125835, is a racing unit bearing with a 6 on 5-1/2″ bolt circle. It uses 5/8″-18 studs and is designed specifically for Spidertrax 35 splined axle shafts.
Built for Ultra4 rock racers, it uses Timken bearings and full Chromoly heat treated construction. The fit type is Universal Fit, but no vehicle model or year is named.
Key features
- Genuine Timken bearings
- Full Chromoly heat treated construction
- 6 on 5-1/2″ bolt circle with 5/8″-18 studs
- Fully integrated drive slug
- Right hand threaded spindle nut for the right side
Bolt pattern and hub alignment
The bolt circle has to match the hub and the wheel before anything else. A pattern that is close but not exact can leave the studs bearing on the wrong part of the hole, which loads them unevenly and can lead to stud or hub damage. Measure the existing pattern carefully and compare it with the bearing before assembly.
Hub alignment matters just as much. Clean the mating faces, check that the bearing seats square, and tighten the nuts evenly in a crisscross order. Spacers are not a reliable way to correct a different bolt pattern, because they change load paths and can shorten stud life. Recheck torque after the first drives.
- Measure the existing bolt pattern before mounting
- Clean and inspect the hub and mating faces
- Tighten fasteners evenly and recheck after initial use
Specifications
| Brand | Spidertrax Offroad |
|---|---|
| Part number | FUBR65125835 |
| Bearings | Genuine Timken |
| Construction | Full Chromoly, heat treated |
| Studs | 5/8″-18 |
| Bolt circle | 6 on 5-1/2″ |
| Axle shaft fit | Spidertrax 35 splined axle shafts |
| Fit type | Universal Fit |
Vehicle fitment
No vehicle model or year is named for this bearing. It is tied to Spidertrax 35 splined axle shafts and a 6 on 5-1/2″ bolt circle, so check both against your axle before ordering.
The 5 on 5-1/2″ version, FUBR55125835, uses a different bolt pattern. Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Check the 6 on 5-1/2″ bolt circle before assembly, since this version is not the 5 on 5-1/2″ pattern. The right hand threaded spindle nut is intended for the right side of the vehicle.
What’s included
The unit bearing with its integrated drive slug and spindle nut.
Not included: Spidertrax 35 splined axle shafts.
