Thunderbike SPS 4 • Harley-Davidson Sportster S (RH1250S)

Finally online! The Thundertalk between Lance David Arnold and Andreas Bergerforth.

Lance is a well-known German racing driver. He has proven his skills as a driver for Porsche. In addition to his successful racing career, he also works as a presenter for Automobil Vox. Thanks to their racing experience, the Thundertalk is particularly informative about the sporty Harley.

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This hot appliance is the latest addition to the SPS series

The Sportster S with its modern chassis and extremely agile Rev-Max 1250T engine, which not only delivers a wide rev range thanks to variable timing, but also a whopping 122 hp peak power on the road, provides the perfect basis for supersport custom projects made by Thunderbike.

In this case, our project not only received the sporty GT wheels in 6.00 x 18 inch at the rear and 3.50 x 21 inch at the front, but for the first time we also designed the front wheel of a Sportster S to accommodate two brake discs. In order to be able to fit two brake callipers, the upside-down fork was given new milled brake calliper mounts and an additional radial brake calliper by brembo. To improve the response behaviour, the stanchions were also coated in gold DLC at the same time.

Seating position

To support this sporty concept, the bike was fitted with our relocated footrest system and triple clamps with flat handlebar mounts specially developed for the Sportster S. This means that the riding position now matches the new riding dynamics of our Sportster S 100 per cent.

Driving dynamics

This new front end with 21″ front wheel and 340 mm brake discs not only looks sporty. The conversion also makes the bike more dynamic, as the narrower front tyre significantly improves handling. The conversion of the brake system also makes a sporty contribution, with the 2-disc brakes doing their job with incredible ease and leaving nothing to be desired.

This project is further enhanced by many finely milled parts from our range: radiator cowling, engine cover, pulley cover, shock absorber cover, headlight cowling, grips, indicators etc. are all from our SPS series.