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Gear Selector DRT "4-gear"

for Vespa 50 S 2°/Special V5B3
-4T 1°/SR/SS/90 R/SS/125/PV
1°/ET3 1°
Ø 51 mm, hardened, square,

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)  111589 (PIAGGIO), CRS 4m 51mm k175/<76 (DRT)

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This article can be found in the following exploded drawings ... go Go to Exploded Drawings!
15011000 $1.98
63791000 $16.31
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Gear Box - Drive Shaft


130g / piece
Stock on hand   Amount


Pages(s) 471 466 to open.
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icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
PIAGGIO APE 250 125 TM1T 2T AC `70-`74
PIAGGIO APE 50 50 TL1-2T 2T AC `69-`80 TL1 -> TL2T 47286
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 50 S 50 V5SA1T 2T AC `63-`84 15325 -> 69443
VESPA 50 Special 50 V5B3T 2T AC `75-`83 ->94314
VESPA 50 Special Elestart 50 V5B4T 2T AC '75-'76 -> 1513
VESPA 50 SR / Sprinter 50 V5SS2T 2T AC `71-`79 -> 10379
VESPA 50 SS / Super Sprint 50 V5SS1T 2T AC `65-`71
VESPA 90 Racer 90 V9SS2T 2T AC `71-`74
VESPA 90 SS Super Sprint 90 V9SS1T 2T AC `65-`71
VESPA 125 125 VMA1T 2T AC `65-`67
VESPA 125 Primavera 125 VMA2T 2T AC `67-`83 -> 150202
VESPA 125 Primavera ET3 125 VMB1T 2T AC `76-`90 -> 8160

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