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 Engine Oil-Finder

Single Sided Swinging Arm

Research by Stephan Handeck


The single-sided swinging arm should both, guide the rear wheel of a two-wheeled vehicle alone, and also substitute for the twin-shock swinging fork. This allows easier adjustment (e.g., of the chain tension and the wheelbase) and above all, a fundamental relief as far as wheel assembly and chain changing is concerned. This is important in both everyday use and to a large extent, in racing sport.


Above the round opening, the single-sided swinging arm with full-floating axle and needle bearings, is mounted to the frame. Here it is especially wide to neutralise the tilting effect. Below the mounting, the shock absorber is joined to the arm. Thereby ensuring the exact guidance of the rear wheel, the taking up of the braking- and acceleration forces and the cushioning and damping of road surface impacts.

On the lower part the wheel with disc brake is mounted on the right, and the chainwheel on left. Through the use of an eccentric shaft the adjustment of the wheelbase and above all, the chain tension is made possible. The chainwheel is connected with the drive axle through a rubber-buffered plate which decreases gear change and acceleration noise. To avoid twisting of the rear wheel, in relation to the drive axle shaft, it is held either by four solid threaded bolts or (with central screwing, secured by a split pin) by four metal claws.

Incidentally, there are single sided swing arms already quite a while. From 1948, for example, the Imme R 100 is built at the Riedel-Motoren AG in Immenstadt. 05/10

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