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@edric
No a tensioner is for singlespeed not fixed it is designed for use on vertical dropouts where you cant move the wheel fore and aft to tighten the chain .A common gear to do most things on is about 72 inches which is 48 tooth ring and an18 tooth sprocket based on 27 inch wheels.to work out the ratio multiple the chain ring size by the wheel size and divide the result by the sprocket size hence 48x27/16=72.