Tern Mainstay Chain Guide

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 chain stays of folding bikes, the waves just get amplified in size. Tern spent 12 months modeling chain movement on different combinations of cassettes and chain rings and chain lines and developing a device to eliminate chain drops for all combinations. That’s the new Tern Mainstay Chain Guide, a patented design that keeps your chain in its place.