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Driving report Speer-Suzuki GSX-R 750

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Weighing just 156 kilograms, but with 156 hp: values ​​with which Reutlingen-based Suzuki guru Herbert Speer fulfilled a customer’s dream of a highly agile driving machine. Wiry, trained and with wide-awake eyes, the 62-year-old Bernd Robatzek talks about the dubious trend towards more and more power with more and more weight and cites the current MotoGP scene as the best example. »Twenty percent less displacement and power, ten kilos less weight ?? and drive in circles faster than ever before. ”This confirms his feeling with his GSX-R 750“ Suzi-Superlight ”. He has worked hard for them over the past year? and invested a few pennies. And all because from time to time he indulges in lustful frenzy during racetrack training sessions.

And indeed: when MOTORRAD puts the black lightness on the scales in the Hockenheimer Motordrom, it feels as if the engine was still on the workbench. With a weight distribution of 84 kilograms on the front axle to 72 kilograms in the rear, not only is the weight of 156 kilograms correct with a full tank, but also the balance of the K7. So the Speer Troop diet is having an effect. A whopping 44 kilograms lighter than the standard, but also roadworthy GSX-R 750, the lightweight weighs 11 kilograms less than a 250cc two-stroke Aprilia, which has long been a reference in matters of handling.

The first test ride with the Speer Suzuki can only be a foretaste of what the flyweight can be expected under correct circumstances. Such an icy wind sweeps through the Motodrom that not even the Michelin Pilot Power tires get up to temperature. Which doesn’t change the fact that the GSX-R can be turned and folded without any resistance. And it doesn’t matter, whether in the meandering behind the Sachskurve or in the hairpin. If handiness and steering reactions over 100 km / h are clearly noticeable in normal super sports cars, the lightweight construction actually feels as if you have forgotten to install the engine. The reasons for this lie less in the overall weight than in the extremely light carbon fiber wheels and the ceramic brake discs installed at the front. With the disadvantage that the superb handling is opposed to a certain nervousness. On the way through the elongated Parabolica, pendulum movements around the steering axis interfere, which are also noticeable during gear changes. So the diet planners around Herbert Speer still have a little more detailed work to convert the decisive weight advantages into corresponding lap times.

During tests in spring, MOTORRAD will investigate the question of whether, with just under 50 kilograms less weight, later braking points and higher cornering speeds can be achieved compared to the production bike.

Conversion info Speer-GSX-R 750

So it was slimmed down:

Motor / drive:
Crankshaft lighten 0.8 kg, dismantling the balance shaft 0.6 kg, dismantling the alternator 1.3 kg, aluminum clutch plates 0.4 kg, dismantling fan 0.65 kg, 510 chain / pinion 0.5 kg.

Unsprung masses:
BST carbon wheel front 2 kg, Starfire ceramic brake discs front 1.7 kg, BST carbon wheel rear 4 kg, small rear brake caliper 0.9 kg, lightened brake disc rear 0.36 kg, all axles made of titanium 0.8 kg.

Suspended masses:
Light wiring harness 1.0 kg, A123 lithium-ion battery 2.7 kg, carbon rear frame 5.8 kg, carbon cladding 1.6 kg, carbon cladding bracket 0.5 kg, Bodis Titan-Race complete exhaust 6, 3 kg, aluminum tank 2.8 kg, front carbon mudguard 0.37 kg, removal of all StVZO parts 4.5 kg, ignition lock / immobilizer 0.56 kg, titanium engine bolts 0.21 kg. In addition, all components were made easier and modified by hand.

Weight:*
Fully fueled 156 kg (series Suzuki GSX-R 750 (K7) 200 kg), weight distribution 54/46%, with 70 kg driver 50/50%.

Price and contact:
Conversion without a basic motorcycle: around 24,000 euros
Contact: Suzuki-Speer, Wannweiler Strasse 67, 72770 Reutlingen

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