Blackspire stinger chain tensioner double ringthe blackspire stinger is a versatile chain tensioner which converts to a single ring chain guide when combined with a blackspire blackguard inner plate for amazing function and fantastic value for money this is a lightweight tensioner weighing in at only 90 grams and it will work with almost any bashring for your convenience and ease of use designed for all mountain and freeriding featureslightweightworks with almost any bashringmolded stepped