Siren bracket

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

Created: 2012 June 10

Updated: 2020 September 30

The siren bracket welded to the frame of some police frames appears as in the photos below. The bracket is made of steel, ~5 mm thick with a 14 mm diameter hole. Should you wish to add a siren bracket to your frame, please use the pattern I created below by tracing the outline of an original bracket.

Thanks to Bill Horribine for helping me identify the mount for the rubber pad (bumper).

Pattern for adding a siren bracket to a frame

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Siren bracket as fit to the frame of some V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police motorcycles for police applications. It is made from steel 5 mm thick. — Siren bracket as fit to the frame of some V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police motorcycles for police applications. It is made from steel 5 mm thick.
Photo courtesy of Gregory Bender.

The base is ~70 mm long. — The base is ~70 mm long.
Photo courtesy of Gregory Bender.

The front side is ~73 mm long. — The front side is ~73 mm long.
Photo courtesy of Gregory Bender.

The length of the side for the cable mount is ~20 mm. The cable mount is 20 mm long with a 16 mm diameter. The slot is 3 mm wide. The cable mount is threaded to accept a 9 mm × 1.25 mm cable adjuster (same as is used for the front brake cable, etc). — The length of the side for the cable mount is ~20 mm. The cable mount is 20 mm long with a 16 mm diameter. The slot is 3 mm wide. The cable mount is threaded to accept a 9 mm × 1.25 mm cable adjuster (same as is used for the front brake cable, etc).
Photo courtesy of Gregory Bender.

The back side is ~49 mm long before the curve begins. — The back side is ~49 mm long before the curve begins.
Photo courtesy of Gregory Bender.

A close up of the curve. The hole is 14 mm in diameter. — A close up of the curve. The hole is 14 mm in diameter.
Photo courtesy of Gregory Bender.

The triangular reinforcement piece beneath the back side is ~40 mm long, 7 mm wide near the frame, and 5 mm furthest from the frame. It is made from steel 5 mm thick. — The triangular reinforcement piece beneath the back side is ~40 mm long, 7 mm wide near the frame, and 5 mm furthest from the frame. It is made from steel 5 mm thick.
Photo courtesy of Gregory Bender.

The mount for the rubber pad (bumper) is ~16 mm wide, ~23 mm tall, and has a ~6.2 mm hole drilled in it. It is made from steel ~3.15 mm thick. — The mount for the rubber pad (bumper) is ~16 mm wide, ~23 mm tall, and has a ~6.2 mm hole drilled in it. It is made from steel ~3.15 mm thick.
Photo courtesy of Gregory Bender.

When a level (Harbor Freight item number 65691) is aligned along the rear side of the siren bracket, it is mounted at an angle of 30°. Please note that this police frame does not have a side stand bracket mounted to the left lower frame rail. A side stand bracket - with the bare frame sitting on the floor - would alter the orientation of the frame and that would change the observed angle of the siren bracket. — When a level (Harbor Freight item number 65691) is aligned along the rear side of the siren bracket, it is mounted at an angle of 30°. Please note that this police frame does not have a side stand bracket mounted to the left lower frame rail. A side stand bracket - with the bare frame sitting on the floor - would alter the orientation of the frame and that would change the observed angle of the siren bracket.
Photo courtesy of Gregory Bender.

A close up of the observed angle. — A close up of the observed angle.
Photo courtesy of Gregory Bender.

The front of the bracket is positioned ~45 mm behind the vertical portion of the loop. — The front of the bracket is positioned ~45 mm behind the vertical portion of the loop.
Photo courtesy of Gregory Bender.

The mount for the rubber pad (bumper) is positioned ~14 mm behind the siren bracket. — The mount for the rubber pad (bumper) is positioned ~14 mm behind the siren bracket.
Photo courtesy of Gregory Bender.

Another look at the mount for the rubber pad (bumper), positioned ~128 mm behind the vertical portion of the loop. Note that the angle of the mount for the rubber pad (bumper) is the same as the angle of the large cable bracket. — Another look at the mount for the rubber pad (bumper), positioned ~128 mm behind the vertical portion of the loop. Note that the angle of the mount for the rubber pad (bumper) is the same as the angle of the large cable bracket.
Photo courtesy of Gregory Bender.

I tried to align the tool with the front edge of the bracket. This angle is ~83°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed. — I tried to align the tool with the front edge of the bracket. This angle is ~83°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed.
Photo courtesy of Gregory Bender.

I tried to align the tool with the rear face of the mount for the rubber pad (bumper). This angle is ~63°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed. — I tried to align the tool with the rear face of the mount for the rubber pad (bumper). This angle is ~63°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed.
Photo courtesy of Gregory Bender.

I tried to align the rear edge with the slot of the tool. This angle is ~72°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed. — I tried to align the rear edge with the slot of the tool. This angle is ~72°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed.
Photo courtesy of Gregory Bender.

I tried to align the tool with the face of the large cable adjustment barrel. This angle is ~122°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed. — I tried to align the tool with the face of the large cable adjustment barrel. This angle is ~122°. Please note it is difficult pull exact angle measurements as the loop piece is not straight. When replicating, be careful to position your measuring device in a manner similar to how mine is photographed.
Photo courtesy of Gregory Bender.

This distance is 28 mm. — This distance is 28 mm.
Photo courtesy of Gregory Bender.

This distance is 26 mm. — This distance is 26 mm.
Photo courtesy of Gregory Bender.

This distance is 10 mm. — This distance is 10 mm.
Photo courtesy of Gregory Bender.

This distance is 9.5 mm. — This distance is 9.5 mm.
Photo courtesy of Gregory Bender.

A view of the underside for clarity. — A view of the underside for clarity.
Photo courtesy of Gregory Bender.

Another view of the underside for clarity. — Another view of the underside for clarity.
Photo courtesy of Gregory Bender.