I have heard they will, but it depends on how you ride. Iam real easy on mine, when Iam stuck Iam stuck. I ride with people that go through stuff balls to the wall, and I would say that they have a better chance of breaking axles than I do. I gained a total of about 2 1/4" just with the lift and another 2" with the tires. I love it!! I actually step up on to my bike. I haven't been out on it yet, that will be this weekend. Fom the looks of it I have gained alot of ground clearence. I will let everyone know how it does after this weekend.