4 bolt installation at 6.4 cm on center New old stock product. Purchased from an old line Honda dealer who stocked lots of OEM and high quality replacement parts in the heyday of Japanese imports but is now closed.
428 chain 4 mounting holes at 6.4 cm on center. Not totally sure this product number listed is correct Will fit many Hondas marked 41201-21-000
These sprockets are new and within +- 2 teeth of specified OEM sprocket sizes from Reputable Sprocket Charts. Smaller number of teeth give you faster acceleration. Larger number of teeth give you more top speed.
Email me with any questions as products are not returnable