You are brave to ride thru West Sac daily, I hate that ride. As for RR tracks, I usually just lift my front tire a bit as I go over them as you do. I've never had that kind of issue. Do you think you tried to coast? That would give you that "bucking" feeling.
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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC