These instructions make clear that the Shimano LT-4 is a 4 speed system supporting a single chainwheel and a sprocket sets from 12-18 teeth to 12-21 teeth. This document is also usefully dated November 1988. Finally it is branded 'Shimano F1', with a funky, high speed, logo. I have yet to discover what this means.

And dig that crazy cable routing.

• Publisher: Shimano
• Country: Japan
• Date: November 1988
• Derailleur brands: Shimano
• Derailleurs: Shimano LT-4 (LT45)