MKS chain tensioners
Don't settle for ugly, clunky BMX chain tensioners!
This compact chain tensioner may be small but it is top quality, as everything made in Japan by Mikashima (MKS) is.
Although designed for Keirin track racing, the ease of use makes them perfect for your street bike.
• adjustable from 1-3cm using a 3mm allen wrench (included)
• two sizes - 5mm for use on most steel frames and 8mm for thicker aluminum track ends (only 5mm is NJS certified for those who may care)
• 5mm sold in pairs, 8mm sold individually