Paul Component Engineering Melvin Bicycle Chain Tensioner

The Paul Melvin is a chain tensioner that mounts at the derailleur hanger, letting riders run a single-speed rear wheel on frames with vertical dropouts. Its two-pulley design can also handle a few gears with multiple front chainrings.

Features

• Bolts to the frame where a rear derailleur normally mounts
• Pulleys provide 20 teeth of chain wrap
• Pivot spacers adjust chainline
• Pulleys float side to side to absorb small chainline variances
• Sealed bearings in the pulleys
• Cage wide enough for 1/8 inch single-speed chains
• Fits frames with a derailleur hanger, including Boost and fat bikes, that have vertical dropouts

Specifications

• Material: 6061 aluminum, anodized finish
• Weight: 108 g
• Chainline range (135/142 mm spacing): 44-52 mm
• Largest rear cog: 20 teeth