Fits all folding bikes with alloy frames 

If you could watch your chain, you’d see waves of energy literally bounce the chain as it moves up and down the cassette or when riding on rough roads. With the shorter chainstays of folding bikes, the waves just get amplified in size.
The Tern Mainstay™ chain guide eliminates chain drop for single chainring bikes without sacrificing shifting performance. Dramatically enhances chain stability by reducing unwanted energy to ensure the chain stays on when shifting or riding rough roads.

Dampens chain bounce without sacrificing shifting performance
Made from lightweight, rugged fiber-reinforced nylon
Easy vertical and lateral adjustment

Tern patented design
Dimensions: W 8 x L 7 x H 3.5 cm
Weight: 50 g / 1.8 oz
Color: Black

Free shipping as well 

Thanks