EGIG PERFORMANCE auxiliary shaft Poligon for Vespa Smallframe
Poligon auxiliary shaft of the higher quality EGIG PERFORMANCE series for powerful Smallframe engines up to approx.
The EGIG PERFORMANCE auxiliary shaft in Poligon design is the more resilient series above the S/R street/road line. It is designed for more powerful Vespa Smallframe engines and, according to the information available, can accommodate engines up to approx. 180 cc and 35 hp without any problems. The Poligon design works with a form-fit connection and distributes the power transmission over several contact surfaces of the polygonal contour. The auxiliary shaft can be combined with the original Vespa Smallframe gearbox 58-54-50-46 and is available in three practical gear ratios: 10-14-17-20, 10-14-18-20 and 10-14-18-21.
EGIG PERFORMANCE
Poligon
up to 180 cc
up to 35 hp
Original SF gearbox
58-54-50-46
Check gradation
What makes the product special
EGIG PERFORMANCE auxiliary shaft of the higher-quality series for Vespa Smallframe engines
Poligon design with M10x1.0 thread
Positive-locking power transmission via polygonal contact surfaces
Suitable for engines up to approx. 180 cc and 35 hp according to available specifications
Can be combined with original Vespa Smallframe gearbox 58-54-50-46
Available in 10-14-17-20, 10-14-18-20 or 10-14-18-21
For powerful road and sports engines with cleanly tuned gear connection
Higher-quality EGIG PERFORMANCE series
This auxiliary shaft belongs to the higher-quality EGIG PERFORMANCE series and is therefore positioned above the S/R street/road line. While the S/R version is intended for street engines suitable for everyday use, this version is aimed at more powerful smallframe setups with higher loads in the transmission. The recommended application range is for engines up to approx. 180 cc and 35 hp
. Poligon version with M10x1.0 thread
The version described here is the Poligon version. The thread of the auxiliary shaft is M10x1.0. As a differentiation: The cone version uses M12x1.25. Cone and Poligon components must always be selected to match the rest of the primary drive, the fastening and the nut used. A mixture of both systems is not intended.
Poligon or cone: Note the thread
Poligon version: M10x1.0 thread
Cone version: M12x1.25 thread
The variant described here is the Poligon auxiliary shaft
Fastening, primary pinion, nut and lock must match the respective version
Why Poligon
? The Poligon connection transmits the torque positively via several contact surfaces of the polygonal contour. As a result, the load is distributed more widely than with connections that are subject to high point loads. This type of power transmission is an important advantage, especially for powerful smallframe engines with hard load changes, because the auxiliary shaft, primary drive and mounting must work together mechanically.
Available gradations
The EGIG PERFORMANCE auxiliary shaft is available in three gradations. The choice of gradation determines how narrow or long the upper gears are. This is particularly relevant for smallframe engines with resonance exhaust, larger displacement and sporty primary ratios.
| Gradation | Character |
|---|
| 10-14-17-20 | Narrower gradation with shorter third gear, useful for sporty setups with precise gear connection |
| 10-14-18-20 | Balanced gradation with short fourth gear for powerful road and sports engines |
| 10-14-18-21 | Longer fourth gear for engines with sufficient torque and suitable overall ratio |
Can be combined with original Vespa SF transmission
The auxiliary shaft can be combined with the original Vespa Smallframe transmission 58-54-50-46. This means that the setup remains manageable for many transmission concepts as long as the gears, shift claw, main shaft, spacing and primary drive match the selected setup. Tooth flanks, claw windows and running marks should be carefully checked on used gears.
Installation and tuning instructions
Only use secondary shaft with matching gears and correct spacing
Check original SF gear wheels 58-54-50-46 for wear before installation
Check shift claw, gear wheel window, axial play and tooth flanks together
Poligon fastening, nut and lock must match the M10x1.0 version
Do not mix cone and Poligon components with each other
After installing the gearbox, check all gears for proper engagement and free rotation
Scope of delivery
Scope of delivery according to the information provided
EGIG PERFORMANCE Poligon auxiliary shaft
Graduation depending on the selected variant: 10-14-17-20, 10-14-18-20 or 10-14-18-21
Gear wheels, nuts, locking parts, shift claw, spacers or other mounting accessories should only be regarded as included if they are listed separately in the specific item scope of delivery.
Suitable vehicle models
Brief technical overview
| manufacturer | EGIG PERFORMANCE |
|---|
| Series | Higher quality EGIG PERFORMANCE series |
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| type | Auxiliary shaft |
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| version | Poligon |
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| Recommended use | Engines up to approx. 180 cc and 35 hp |
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| Graduations | 10-14-17-20, 10-14-18-20 or 10-14-18-21 |
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| Compatible gearbox | Original Vespa Smallframe gearbox 58-54-50-46 |
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| Thread Poligon | M10x1.0 |
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| Thread cone | M12x1.25, only as a comparison to the cone version |
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| Suitable for | Vespa V50, PV125, ET3, PK50, PK80, PK125 with matching smallframe gearbox |
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| Mounting instructions | Check gears, shift claw, axial play, spacing, fastening and primary drive before installation |
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Conclusion
The EGIG PERFORMANCE Poligon auxiliary shaft is the right choice for more powerful Vespa Smallframe engines where an original SF 58-54-50-46 gearbox is to be combined with a more resilient auxiliary shaft. The Poligon version with M10x1.0 thread relies on positive power transmission and is suitable for engines up to approx. 180 cc and 35 hp. With three available gear ratios, the gear connection can be specifically adapted to the respective setup.
FAQ
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