BMW PAIR FRONT DISCS R80R R100R MYSTIC. The rotors measure 3.5mm, hence price. The casting number is 1454179. We are the UKs largest independent BMW parts supplier. Motorworks series part number: RRR00000. Motorworks UK are the UK’s largest independent supplier of new and used parts for BMW motorcycles. As well as stocking a huge range of parts for all BMW models, we salvage used BMW bikes. We’ve been in business since 1989 and are proud of our reputation for friendly, helpful and knowledgeable customer service. Don’t be afraid to ask if you require any further information regarding a listed item. We are unable to respond to messages at weekends. Depending on the weight and size of the parcel different costs may apply for Northern Ireland, Isle of Man, Isle of Wight, Scilly Isles and Highlands and Islands.