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Gear Selector DRT "4-gear PK"

for Vespa PK50-125/S/XL/XL2
Ø 50,2 mm, hardened,
"PK-Stretta", 4-arms

The gear selector spiders, for small frame motors, made by DRT are produced using a harder grade of steel than the original items, hardened and sealed for a tough surface finish and are precisely manufactured to ensure minimal production tolerances. They can withstand larger amounts of power and torque making them ideal for performance orientated motor setups. We have two versions of this item available for 4 small frame motors with a 4-speed gear box, one with an overall diameter of 51mm and the other with a 50,2mm diameter. DRT makes no difference between and a squared off and rounded ends.


A more exclusive gimmick originating from the Italian racing scene is the 'PK STRETTA' variation of the gear selector spider. These items are modified by DRT to eliminate radial play. This reduces gear jumping due to selection problems and also makes the gear changing mechanism more precise in use. If the outer arms are shortened just slightly this item can also be used on the earlier PV/ET3 motors.


Conclusion: High end gear box components for performance orientated small frame motor tuning projects.


SIP-TIP : The thing that really counts during the assembly of the small frame motors output shaft is to measure precisely and adjust correspondingly the end float after the cogs have been (correctly)arranged in place on the gear cluster. Do not forget to order fresh gearbox oil for successful completion of this conversion. The suitable output shaft assembly tool (Art. No. : 63791000) makes this job a whole lot easier and quicker.


SIP community user “chup4” on Art.-No. 4043175: “The serrated edge that keeps the ball bearings in place are noticeably more defined, which prevents gear jumping effectively combined with a stronger gear selection spring and a well distanced gear box it really proves its worth when measured against the original system. Goodbye jumping gears.”


ESC rider Salvatore Randazzo on Art.-No. 4043175: “The less play between the gears, the better the gear box. I've already set mine up successfully. Two spring races and one fall race, no jumping gears and we didn't even use the clutch to change gear.”

OEM Numbers (for the purpose of comparison)  CRS 4m 50mm k175*/PK 76> (DRT)

15011000 $1.97
63791000 $16.25
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High End Racing Parts

This item is in stock in sufficient quantity.

98g / piece
Stock on hand   Amount


Pages(s) 471 479 to open.
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Product forums
icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA PK 50 50 V5X1T 2T AC `82-`84
VESPA PK 50 S / Elestart 50 V5X2T 2T AC `82-`84
VESPA PK 50 S Lusso / Elestart 50 V5X2T 2T AC `85-`88
VESPA PK 50 SS / Elestart 50 V5S1T 2T AC `83-`86
VESPA PK 50 XL / Elestart 50 V5X3T 2T AC `85-`90
VESPA PK 50 XL FL 50 V5N1T 2T AC `90-
VESPA PK 50 XL HP 50 V5N2T 2T AC `91-`91
VESPA PK 50 XL N NUOVA 50 V5X5T 2T AC `89-`90
VESPA PK 50 XL Rush / Elestart 50 V5X4T 2T AC `88-`90
VESPA PK 50 XL2 / Elestart 50 V5X3T 2T AC `90-
VESPA PK 50 XLS 50 V5S2 2T AC `86-
VESPA PK 80 S / Elestart 80 V8X5T 2T AC `82-`86
VESPA PK 80 S Lusso / Elestart 80 V8X5T 2T AC `85-`88
VESPA PK100 S / Elestart 100 V9X1T 2T AC `82-`84
VESPA PK100 XL 100 V9X2T 2T AC `86-`90
VESPA PK125 125 VMX1T 2T AC `82-`85
VESPA PK125 ETS / Elestart 125 VMS1T 2T AC `84-`85
VESPA PK125 N NUOVO (FL) 125 VMX7T 2T AC `90-`91
VESPA PK125 S / Elestart 125 VMX5T 2T AC `82-`84
VESPA PK125 XL / Elestart 125 VMX6T 2T AC `86-`90
VESPA PK125 XL2 125 VMX6T 2T AC `90-

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