The CBR300 sprocket officially will fit and work on the Rebel 300! I did not clearance the case saver at all, it is a really tight fit but honestly its job is to touch the chain in the event of total chain failure anyway. (which is highly unlikely on a 300cc with a properly maintained chain.) I do not think during normal riding the chain touches it, so far there has been no abnormal noise. Also the factory chain fits around it with some slight adjustments done back at the swingarm. I believe my speeds are now 30/32 40/43 50/54 60/65 obviously there is some rounding up and down going on.
Also now the stock speedometer is off, I kinda forgot about that. Has anyone used a GPS to measure the accuracy of the stock speedometer in MPH?
2017 REBEL 300 ALL STOCK.