4 bolt installation at 7.8 cm on center New old stock product. Purchased from an old line dealer who stocked lots of OEM and high quality replacement parts in the heyday of Japanese imports but is now closed. 520 chain 4 bolt installation. Marked YTM 200 Which is a Yamaha Three Wheeler. May fit other models as well.
These sprockets are new and within +- 2 teeth of specified OEM sprocket sizes from Reputable Sprocket Charts. larger number of teeth give you faster acceleration. smaller number of teeth give you more top speed.
Email me with any questions as products are not returnable