The CST Classic Breaker II tyre. How do you improve on greatness? Actually, this isn't necessary with the Breaker. These tyres are mounted by almost every manufacture so a sales pitch is no longer needed. Despite being sold in large numbers, CST improved and modernized the tread and the tyre is now ready for years to come. Technically the new "Breaker" is related to its predecessor. These new Breaker tyres fit all modern and old wheel models.