Spacer rear shock absorber/silent block -BGM PRO l=26mm- Vespa Sprint150 (VLB1T), GT125 (VNL2T), GTR125 (VNL2T), TS125 (VNL3T), Rally180 (VSD1T), Rally200 (VSE1T)

DISTANCE Piece BGM PRO shock absorber rear top for Vespa Smallframe / Largeframe

The spacer is located between the silent rubber on the frame and the rear shock absorber on the engine. It is an important and highly stressed link between engine and frame. Good quality is an absolute requirement here, which is why BGM PRO now has its own high-quality series.

Available from BGM PRO are five different spacer lengths. These can be installed as desired and required.
Here is a small list of which length, among other things, was used at the factory for which models.

• BGM7626 (26mm): 1962-1979 - Rally, Sprint, VLA (GL), GT, GTR, TS, SS180

• BGM7635 (35mm): BGM special size as intermediate

• BGM7643 (43mm): 1958-1979 - VBA, VGLA/B (GL), VBB1, VNB4 (114714-), VNB5-6, VBB2 (172370-212360), GS160 (32158-), Super 125/150 (VNC/VBC)

• BGM7648 (48mm): 1985- 1998 - PX Lusso

• BGM7652 (52mm): 1977-1985 - PX old, PX Lusso

CONSTRUCTION KIT
With the first large frame models (VNA, 1957) Piaggio started to expand the construction kit principle. Many common parts, such as the rear shock absorber, were intended to create a greater variety of models while reducing costs. The rear shock absorber was therefore only minimally changed within almost 60 years. From 1957-1962 it was still produced with 390mm length, afterwards with 330mm length. The shortening was necessary for the newly planned smallframe models. These were also to be equipped with the same shock absorber, despite a considerably smaller chassis. In order to be able to continue to use the now quite short shock absorber in the larger vehicles, spacers were needed to compensate for the overall height. This made it very easy for Piaggio to achieve the required length without having to design a new shock absorber. In the smallframe models, on the other hand, it was simply used without a spacer.

LENGTH AND EFFECT

• Vehicle height at the rear

• Ground clearance between exhaust and road

• riding geometry (caster of the front fork)

• Differential height between tank and carburetor

• Distance between carburetor/carburetor pan cover and frame

With the spacer, the rear of the vehicle can be varied in height as desired. This is often necessary when large carburetors or large resonance exhaust systems are to be used in an oldie. It should be noted that raising the rear end can also have a strong influence on the handling. The higher the rear end is raised compared to stock, the more nervous/turny the handling becomes. On the other hand, the scooter is more stable when the rear is lower (a keyword for further research is the so-called 'caster' on the front axle). In some models, by the way, no spacer was used at all. This for example with all Smallframe or the PX models starting from 1998 (here again a shock absorber with 390mm was used). Occasionally this may also be necessary with aftermarket shocks that are longer than the stock counterpart

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EXAMPLES FOR THE USE OF A LONGER SPACER

• The rear of the frame is higher

• The exhaust has more distance to the road surface

• The exhaust is closer to the chassis

• The caster of the front wheel becomes lower

• The steering becomes more nervous/turny

• The differential pressure between gasoline level and carburetor is greater

MOUNTING INSTRUCTIONS
All spacers have the M9 thread and the wrench size 14 in common. A spring washer M9 is mounted between spacer and shock absorber.
The spacer itself is screwed directly into the upper silent block in the chassis without a spring washer.

CONCLUSION: Small component with important effect for driving safety!

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