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SI-100-N Snapidle Narrow Floating Chain Tensioner (0226) spherical roller bearing com/products/ucfl206-20-1-1-4-2-bolt-flange-unit"}}SI 100 N Snapidle Narrow Floating Chain Tensioner When space is limited, this narrow version of the SI 100 is just what the engineer ordered! Check out the Snapidle catalog link here for full dimensions and specifications, Correct operating tension is an important factor in the satisfactory performance and life of any chain drive. As chains wear they elongate, which results in sway, slap and increased vibration. This puts undue shock into the drive