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. This may be a reference to the, l,ong anticipated, 1987 return of the Formula One Japanese Grand Prix (that's motor racing for all you diehard pedal-heads).

And dig that crazy cable routing.

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