Hofmann Impact tool for motorcycle plug-in weights Required special tool for the safe and professional handling of Hofmann motorcycle push-on weights Type 711, 712, 713 and 717 on motorcycle spoked wheels. With this special tool, the force required for the weight assembly can be transmitted without damage to the spokes, rims and tires. For safety reasons Hofmann-Motorrad-Steckgewichte should be mounted with no other tool.