hi,
i run 3 mt 26's and have bought 2 new and 1 used. they are super super heavy duty and will probalbly last longer than you. the 2 that i bought new have 5000 and 4600 hours on them in 3 seasons. the one i bought used had 1500 hours on it when i bought it and now has 6000 hours on it and shows no signs of slowing down. as long as you (or a dealer) services them as often as walker says then they will run forever. hope this helped.:thumbsup: