Set of 5 special cluster + rear axle layshaft shims for 'Cyclone 5 Speed' gearboxes. The smaller shims are needed to go on TOP of the gearbox cluster for all Cyclone 5 Speed's marked 'DRT'. The larger shims are NOT normally needed BUT can possibly be required if you are using certain makes of layhaft and / or rear wheel bearing (i.e. usually NON-Casa Lambretta components) and you need to align the 5th gear of the cluster with the loose 5th gear cog. These special shims fit onto the layshaft itself and sit between the layshaft and rear hub bearing, thus effectively raising the layshaft and the loose 5th gear cog, if needed to obtain perfect alignment of the two 5th gears. The set consists of the following shims : 1 x 0.3mm shim for on top of the cluster 1 x 0.5mm shim for on top of the cluster 1 x 0.3mm shim for under the rear wheel axle layshaft 1 x 0.5mm shim for under the rear wheel axle layshaft 1 x 1.0mm shim for under the rear wheel axle layshaft