A bicycle dropout arrangement permits adjustment of the transmission chain or belt tension by allowing the wheel axle 8 to be moved fore-and-aft whilst maintaining a constant or near-constant distance between wheel axle 8 and the centre of the disc brake pad 11 to ensure efficient braking. A dropout plate 12 joined to chain stay 10 and seat stay 2 features a dropout slot 1 that describes an arc about the centre of the disc brake pad 11. Mounts 4,5 for a disc brake caliper may be included. This arrangement means that there is no need for the added complexity and added weight inherent with commonly-used auxiliary adjustable dropout plates.
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