Triumph America/Speedmaster Chain and Sprocket Kit 18/42/112 PN MBI-B5251842

Chains and sprockets wear out, this kit assembled of BikeMaster® quality spares contains:

• 42 Teeth Rear Sprocket
• 18 Teeth Front Sprocket
• BMOR Series 525-112 Link Drive Chain

And is suitable for:

• 03-06 America 800
• 07-16 America 865
• 03-05 Speedmaster 800
• 06-15 Speedmaster 865

BikeMaster® sprockets and chains are meticulously engineered using the highest quality materials and industry leading technology to provide the best replacement sprockets for your motorcycle. 

BikeMaster® o-ring chain offers high durability. The controlled heat-treating process that makes them tough. Reinforced rollers have high impact resistance.

Changing the number of teeth on a sprocket changes the final drive ratio of the bike. Less rear sprocket teeth=higher top speed, more sprocket teeth=more acceleration. Select the number of teeth above.

For installation, follow the instructions in your service manual.