Cycling the Island is an incredible adventure. 
I've opened a window below to the fantastic Wightlink Ferries website, I know its lazy but I couldn't beat how well they present the numerous cycle routes on our Island - plus they've given us 15% discount off all ferry travel, contact us for a booking code. Bikes not supplied.

Scroll within the Wightlink (on mobiles and tablets scroll down the screen for more info).

window for more info and routes.