Home » Third Eye Third Eye Chain Watcher Click Image To Enlarge Third Eye Third Eye Chain Watcher Our Price: $8.99 Add To Cart Wishlist Rate This Product Description Easily attaches to the seat tube (1 1/8 to 1 3/8) and keep your chain from falling off the front chainwheel. Ideal for cyclocross applications or bumpy terrain. You May Also Like Customer Reviews Be the first one to review this product!