Did you know that the very first Harley-Davidson that was produced in 1903 featured belt drive? Ten years later, they offered the chain drive.  Not until 1980 did you see a new H-D model featuring the belt drive again!


Rear Pulleys


Our pulleys start from a solid bar of prime 6061 aluminum.  They are then forged into two difference sized forgings to accommodate the small and large pulleys that are used today.


Once they are forged,  they are machined in to the pulleys.  The teeth have the true gear-cut that exceed the RMA standards for a perfect fit.


Unlike other pulley manufacturers, we only have one single ring on our pulleys and they match the smooth lip design of our wheel blanks.


We offer a wide variety pulley sizes.  As small as the 61 Tooth up the 72 Tooth with widths as skinny 3/4" to the wide 1-1/2"


We stock the most popular sizes, but we can custom order the rare sizes


We stock:

65 Tooth, 1-1/2"

66 Tooth, 1"

68 Tooth, 1"

70 Tooth, 1-1/8"

70 Tooth, 1-1/2"

72 Tooth, 1"


We also offer the Victory pulley, 70 Tooth, 1-1/8".

Why Pulleys?


Belts are lighter than chains, and help reduce unsprung mass at the rear wheel.  Belts are quieter, do not rust, resist environmental pollutants and require no lubrication.   In other words, no oil splatter!

MSI Inc.

9830 Miller Way

South Gate, CA 90280

Tel  562.583.4530

Fax 562.928.9276


Office Hours:

Monday - Friday

7am to 4pm PST