Ive got a nc31 1992 super four i need to know the correct size of sprockets and pich of chain ???

i wish to change mine due to bike reving to much when iam doing 70 mph the bikes running at 7000 rpm


at the moment iam running front sprocket 15 , rear 45 , chain i think 525 . whats the startard set up

Hey there, sounds like you've got the Version R setup running on your bike. The Version R + S of the Super Four both run the 15 front and 45 rear sprocket sizes (with a 525 - 112 link chain), but the regular Super Four, which yours will be, would normally be running the 15 front 42 rear sprocket sizes with a 525 - 110 link chain instead. Hope that's of some help.

My bike would normally be running just shy of 8000rpm when sitting at 70mph though.

ok thanks mate thats helped me