Roth Engineering

2011 World Championship competitor
BuilderLasse Sundberg
OwnerLasse Sundberg
LocationUpplands Väsby
Countryflag se Sweden
Bike Name1668
Engine Make/SizeHusqvarna 550cc side valve 1923
DrivetrainHusqvarna 3-speed 1923
Frame Make/TypeRoth Eng. Single loop.
Front EndRoth Eng. Druid.
Rake48 degrees.
Wheels FrontClincher rim, Jammer hub.
Wheels RearTriumph rim, HD front hub.
Tires FrontFirestone Racing. 28x2 1/4
Tires RearAvon. 4.00s19
Brakes FrontRoth Eng. outside band brakes
Brakes RearRoth Eng. outside band brakes
PainterAirbrush studio Stockholm.
Chroming/PlatingBålsta Metallsliperi.
Additional InfoCarb: Amal premonoblock. Floor boards: Husqvarna 1920. Left clutch, right brake. Handlebar: by owner. Left shifter, right throttle, operated by links. Grips: Husqvarna 1920. Stainless exhaust: By owner. Seat: Brooks. Alternator: Indian 12v. Belt drive: Harley Davidson FXR. Narrowed. Front pulley from old top fuel bike. Hydraulic/wire brake system. Hydraulic clutch. Front light: Indian 1915 side car. Rear light: Phone switchboard indicator light.
Druid type front end, frame, rear fender, brakes, fuel and oil tank, battery box, controls: By owner. Oil system modified from total waste to circulation. Engine bored to 600cc. Ignition: Thunder heart twin cam. Coil and ignition box in left tank. Ignition adjustment made with laptop. Crank sensor HD, trigger plate by owner.
Everything handmade. No CNC used.

Photography courtesy of Onno Wieringa


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