Coil Rear Shock – To fit Revvi 16 XL electric bikes kayo Can this helmet be used Can this helmet be used for motorsport Feature 50cc Beginner Bikes 10Ten 90R Engine Smaller beginner focused engine 90cc 4 stroke air cooled engine Gearbox Usually automatic twist and go Semi automatic gears with no manual clutch Riding Feel Basic first bike feel More like a proper junior pit bike Suspension Entry level setup USD forks and rear mono shock Best For First time young riders Riders ready to progress into gears The 10Ten 90R is the better choice if your rider has outgrown a 50cc style beginner bike and is ready for more performance handling and control on rough terrain Direct replacement rear coil shock