EGIG PERFORMANCE S/R countershaft cone for Vespa Smallframe
Tapered auxiliary shaft made from forged blanks for stable Smallframe road engines up to approx. 170 cc and 25 Nm.
The EGIG PERFORMANCE S/R auxiliary shaft in tapered design extends the EGIG street/road product line with a durable transmission component suitable for everyday use for Vespa Smallframe engines. S/R stands for street/road and describes a more affordable line for street use, which nevertheless relies on a stable technical basis. The auxiliary shaft is made from a forged blank and is recommended for road engines up to approx. 170 cc and 25 Nm. Depending on the desired gear connection, it is available in 10-14-18-20 or 10-14-18-21 gradations.
EGIG PERFORMANCE
S/R street/road
Cone
Forged blanks
up to 170 cc
up to 25 Nm
Check gear ratio
What makes the product special
EGIG PERFORMANCE S/R auxiliary shaft for Vespa Smallframe engines
S/R stands for street/road: product line suitable for everyday use with a stable design
Cone design with M12x1.25 thread
Made from forged blanks
Recommended for road engines up to approx. 170 cc and 25 Nm
Available in 10-14-18-20 or 10-14-18-21
Compatible with standard gear wheels 58 / 55 / 54 / 50 / 46
S/R: street/road for stable street engines
The suffix S/R stands for street/road at EGIG. This refers to a product line for everyday road use, which remains more accessible in terms of price, but still relies on a solid technical design. This auxiliary shaft is therefore not positioned as an uncompromising racing part, but as a resilient transmission component for powerful smallframe street engines up to approx. 170 cc and 25 Nm.
Cone version with M12x1.25 thread
This variant is the tapered version of the EGIG S/R auxiliary shaft. The thread of the auxiliary shaft in the cone version is M12x1.25. This distinguishes it from the Poligon version, which has an M10x1 thread. Cone and Poligon systems must always be selected to match the rest of the primary drive and the mounting used.
Cone or Poligon: Note the thread
Cone design: M12x1.25 thread
Poligon version: M10x1 thread
The variant described here is the cone auxiliary shaft
Fastening, primary pinion and nut must match the respective version
Available gradations
The EGIG PERFORMANCE S/R auxiliary shaft is available in two ratios: 10-14-18-20 or 10-14-18-21. The choice of ratio depends on the engine character, the primary gear ratio, the cylinder used, the exhaust and the desired gear connection. The variant with 20 teeth in fourth gear is shorter, the variant with 21 teeth in fourth gear is longer.
| Gradation | Character |
|---|
| 10-14-18-20 | Shorter fourth gear, helpful for powerful road engines with a narrower gear connection |
| 10-14-18-21 | Longer fourth gear, useful for engines with sufficient torque and a suitable overall ratio |
Compatible with standard gears
The auxiliary shaft is compatible with standard gears with 58 / 55 / 54 / 50 / 46 teeth. Before assembly, gear wheels, spacing, shift claw, auxiliary shaft, main shaft and axial play should always be checked together. The wear pattern, tooth flanks, claw windows and running marks are important checkpoints, especially for used transmission parts.
Assembly and tuning instructions
Only use the auxiliary shaft with matching gears and correct spacing
Check axial play, gear claw, gear wheel window and tooth flanks before assembly
Cone fastening, nut and lock must match the M12x1.25 design
For engines above the recommended range of approx. 170 ccm and 25 Nm, check stronger EGIG variants
After installing the gearbox, check that all gears engage properly and rotate freely
Scope of delivery
Scope of delivery according to the information provided
EGIG PERFORMANCE S/R auxiliary shaft cone
Graduation depending on the selected variant: 10-14-18-20 or 10-14-18-21
Gear wheels, nuts, locking parts, shift claw, spacers or other mounting accessories are only included if they are listed separately in the specific item scope of delivery.
Suitable vehicle models
Vespa V50, 50 N, 50 L, 50 R, 50 S, 50 Special and 50 Special Elestart with matching Smallframe gearbox body. Gear wheels, shift claw, spacing and primary drive must match the auxiliary shaft.
Vespa 125 Primavera and Vespa 125 Primavera ET3 with matching smallframe gearbox. Recommended for road engines up to approx. 170 cc and 25 Nm, provided the overall setup is suitable.
Vespa PK50, PK80 and PK125 models with matching smallframe gearbox setup. Gear wheels, shift claw, main shaft, primary drive and spacing must be checked before installation.
Motovespa smallframe-related models may be relevant depending on the engine and gearbox base, but must be checked individually. Spanish Motovespa models may differ from Italian Vespa Smallframe models depending on the year of manufacture, market version, gearbox, main shaft, auxiliary shaft and gearshift components.
Brief technical overview
| manufacturer | EGIG PERFORMANCE |
|---|
| Series | S/R, street/road |
|---|
| type | auxiliary shaft |
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| Version | cone |
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| Material base | Made from forged blanks |
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| Recommended use | Road engines up to approx. 170 ccm and 25 Nm |
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| Gradations | 10-14-18-20 or 10-14-18-21 |
|---|
| Compatible gears | Standard gears 58 / 55 / 54 / 50 / 46 |
|---|
| Thread cone | M12x1.25 |
|---|
| Thread Poligon | M10x1, only as a comparison to the Poligon 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 |
|---|
Conclusion
The EGIG PERFORMANCE S/R auxiliary shaft cone is a useful transmission component for stable Vespa Smallframe road engines up to approx. 170 cc and 25 Nm. It combines a base made from forged blanks with practical gear steps and compatibility with standard gear wheels. If you are building a powerful but clearly street-oriented engine, this is a technically suitable solution within the EGIG street/road line.
FAQ
S/R stands for street/road. This refers to a product line for everyday street use with a stable design, but without the claim of a maximum racing component.
EGIG recommends this S/R auxiliary shaft for road engines up to approx. 170 cc and 25 Nm. For more powerful engines, correspondingly more resilient transmission components should be tested.
The gear ratios 10-14-18-20 and 10-14-18-21 are available. The choice depends on the engine character, primary gear ratio, exhaust and desired gear connection.
The auxiliary shaft is compatible with standard 58 / 55 / 54 / 50 / 46 gears. The condition, tooth flanks, claw window and spacing must still be checked.
The cone version uses M12x1.25, the Poligon version M10x1. The fastening, nut, primary pinion and system must match the respective version.
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