Outer Diameter of Center of 3.5K Trailer Hub/Drum Assembly with 5 on 4-3/4 Bolt Pattern

Updated 06/29/2015 | Published 06/24/2015

Question:

I was hoping to find out what size the wheel center bore needed to be to fit over these hubs. Every other measurement was there, just not that one.

asked by: Don-f

Expert Reply:

I went out to the warehouse to measure hub and drum assembly # 845476UC3 for you. The outer diameter of the center of the hub (where the wheel pilot hole will fit around) is 2.60 inches. Just a hair less than 2-5/8 inches.

This will only matter if 1) the wheel pilot hole is too small or 2) if a wheel secures to a hub using wheel bolts instead of lug nuts. Since this hub/drum has studs of lug nuts the pilot hole on the wheel can be larger, just not smaller.

expert reply by: Michael H