Flat tire defender downhill kitgot a big race or an all day session of downhill runs planned want to gain a competitive edge and avoid ending up walking to the bottom of the trails flat tire defenders downhill kit is here to prevent punctures and help you get the absolute best from your tubeless rim and tyre set up this is due to their high quality foam rubber polymer inserts which protect your wheels and tyres improve rolling efficiency over rough terrain and reduce vibration feedback to