Technical regulations 2025
E12
Bike must stay in stock form (as it comes from stacyc) with the exception of the following
*tyres
*seat/seat post
*handlebars
*larger AH batteries may be used but must remain 20v
REVVI 12
*frame and wheels must stay as they come from revvi
*motor may be upgraded to the 170w kit supplied by revvi
*battery may also be upgraded to 5.2ah
E16
Bike must stay in stock form (as it comes from stacyc) with the exception of the following
*tyres
*seat/seat post
*handlebars
*larger AH batteries may be used but must remain 20v
REVVI 16
*frame and wheels must stay as they come from revvi
*motor may be upgraded to the 250w kit (including fast start control unit) supplied by revvi
*battery may also be upgraded to 5.2ah
E2
Bikes must stay stock with the exception of tyres and grips
PW 50
*engine and transmission/drive gear to stay stock
*maximum 10" wheel front and rear
*suspension/bars/foot pegs/tyres open
E3
Frame, swing arm, battery, motor, ecu must stay stock
*suspension my be upgraded
*tyres open
*sprockets/chain open
E5
Frame, battery, motor, ecu must stay stock
*suspension my be upgraded
*tyres open
*sprockets/chain open
50CC AUTOMATICS
Frame, ignition, barrel, crank cases must be of o/e spec (how it left the factory)
*piston may be changed to maximum size of EF (39.48)
*cylinder head, head gasket, clutch and radiators may be modified
*maximum carburettor size 21mm
*Exhaust may be upgraded (must be packed)
*tyres, wheels, swingarm, sprockets open
*suspension may be upgraded
65CC
Piston may be changed to a maximum size of EF (44.98)
*Frame, ignition, barrel, crank cases, carburettor may be modified
*cylinder head, power valve, head gasket, clutch and radiators may be modified
*exhaust may be upgraded (must be packed)
*tyres, wheels, swingarm, sprockets open
*suspension may be upgraded
85CC
Piston may be changed to a maximum size of D (46.97)
*Frame, ignition, barrel, crank cases, carburettor may be modified
*cylinder head, power valve, head gasket, clutch and radiators may be modified
*exhaust may be upgraded (must be packed)
*tyres, wheels, swingarm, sprockets open
*suspension may be upgraded
125CC
Piston may be changed to a maximum size of D (53.97)
*Frame, ignition, barrel, crank cases, carburettor may be modified
*cylinder head, power valve, head gasket, clutch and radiators may be modified
*exhaust may be upgraded (must be packed)
*tyres, wheels, swingarm, sprockets open
*suspension may be upgraded