Whites Rim Lock Nylon - 1.85The Whites Nylon Rim Locks are constructed from a high strength nylon composite material in a one piece moulded design, nylon rim locks weigh up to half as much as a standard aluminium rim lock while gripping the tire more securely and protecting the inner tube better than a traditional rubber rim lock. Their contoured shape reduces abrasions and heat of the tube which provides a more constant and accurate pressure. The Whites Nylon Rim Locks are