Because the extra layer of the Xtreme Trak which makes the bed slightly more durable, we recommend replacing the poly bed every 7-8 years. This time frame can vary depending on the amount of daily use your Xtreme Trak receives.The Trak Xtreme poly bed is 60in wide when measuring from outside edges of the d-rings and includes flaps to cover the d-rings. Be sure to order the spring tool, unless you have the original spring puller from your original purchase. If your original unit is older than 10 years, please fill out a bed measurement sheet. Request on at Info@Gymshorts.com