I just had a new excel rim and new spokes laced to the stock hub of my XR4. I just put it on the bike and, to my dismay, noticed that it hops at speed, like the rim is egg-shaped. (Not real bad, but noticable). I put it on a stand with the front wheel off of the ground, spun it, and the rim (not the tire) definitely has about a 1/2 inch up and down oval to it. None side to side, just up and down. Obviously, I'm going to take it back to the place I had it laced. But before I do- I'm wondering if it could be the axle that is bent. When I dropped it off at the shop, I didn't leave the axle. The bike is well maintained but definitely has many hard miles on it. Has anyone ever heard of a bent front axle causing this problem? Could it be that my old rim was so tweaked that I just didn't notice it? Your accumulated wisdom would be appreciated.