Disc brake spacer for hub flange / bearing carrier / disc carrier

Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models

Created: 2011

Updated: 2024 May 26

If you do not have the correct hub flange / bearing carrier / disc carrier (MG# 13613641), you can use the hub flange / bearing carrier / disc carrier from a Moto Guzzi T3 (etc.) and then fit a spacer to move it out so that the disc is in the right location for our wider forks. Paul Linn has made these in the past. Charlie Mullendore of Antietam Classic Cycle and Steve Odell can make these.

• Machinist drawing of the 10 mm spacer
  Credit: Charlie Mullendore of Antietam Classic Cycle
  Pages: 1

Here are the specifications for these as provided by Steve Odell:

Besides the 10 mm thickness, the two main dimensions are the OD of 4.79 inch to match your bearing carrier OD and the ID of 3.15 inch to match the carrier inner flange step for the rotor. Then there is a 0.2 inch step in and step out on each side of the spacer. The secondary ID of the step out for the rotor can be whatever you want it to be but no smaller than the OD of the axle or larger than the edge of the inner radius of the carrier bearing which on mine was about 2.68 inch. Actually I thought making one just bigger than the axle would look kind of neat.

Not all of these bearing carriers are exactly the same size. It's just a casting and an old one at that. It helps to have the carrier and rotor on hand when doing it. When [the machinist] first cut this spacer it was a real tight fit on the carrier. He had to put it on the lathe and spin it holding some sandpaper to some spots to lap it in. The only way to avoid this is to make the dimensions slightly large. I prefer a close fit. Then you can bolt them together and polish them as one piece if preferred.

Here are the photos of the spacers that Joe Kenny made for Tim Brunner:

Tim mentions that you will need bolts that are 20 mm longer as well. A length of 140 mm works well.

Here are the photos of the spacers that Charlie Mullendore of Antietam Classic Cycle made: