Registered Forum User
BSB Star
Posts: 5,018
Join Date: Jun 2003
Location: Chelmsford, Essex
Mood: the rain in spain falls mainly on me!
pretty much everyone with a duke will change the gearing asap. i've dropped one on the front, other may change the rear instead/as well.
i think it will affect your speedo but the top speed taken from your lap timer will still be 100% accurate. the speedo is out about 8% as standard anyway.