MKS 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)
• available in two sizes - 5mm for use on most steel track frames and 8mm for thicker steel or aluminum track frames (5mm is NJS certified)
• 5mm sold in pairs, 8mm sold individually
Not sure how thick your dropouts are? Don't take a guess. Measure them!