This eccentric ENO hub is made specifically for bikes with vertical dropouts. Chain tension with vertical frames can be addressed three ways; by using a chain tensioner, using an eccentric bottom bracket, or with the eccentric ENO.
This hub allows a rider to adjust chain tension by simply rotating the elliptical axle ends up and back in the dropouts. As the hub rotates back the chain is pulled into tension.
The Eccentric ENO is a flip/flop design fixed/free.
Made in the USA