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Triples Rule Cylinder Block for Triumph Trident & BSA Rocket 3 MotorcyclesTriples Rule offers custom precision performance parts for Triumph and BSA motorcycles. Engineered to the closest tolerances, all Triples Rule parts are built to withstand constant use under the most difficult of conditions.

The manufacturers of Triumph and BSA motorcycles made great “production” motorcycles -  priced to be affordable. Triples Rule examined the parts of these fine motorcycles and then enhanced their durability with modern engineering, materials and CNC precision machining. The highest quality of raw materials are always used when making a Triples Rule part.

We provide the following items and services for Triumph and BSA motorcycles.