Bridgestone made the BT-39 for sub 400cc sports bikes. They are a great all rounder for commute work and reasonable sports riding. These aren't the tyres you would use at the track or for extreme sports riding but a great compromise between grip and life for the more civilised rider. The Front use a double crown radius for a firm grip feel when cornering. The rear is a single crown style. The tyre have a silica added to the compound for added wet grip and feel. Sold in pairs only. 110/70-17 plus 130/70-17 or 110/70-17 plus 140/70-17
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