1. Tyres and wheels. Tyres. Motorcycle tyres. Specification for designations, dimensions and load ratings for code designated series (diameter codes 4 to 12) tyres Part 1.6.3, (28th June 1991) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗