My Niken was perfect up until the moment new front tires were installed. Wobble ever since. Had the bike to two shops trying to resolve it. Bike is actually in the shop right now trying to stop the Wobble. I've seen multiple people complain about the Wobble and I've not seen anyone resolve it yet. I suspect that the toe-in adjustment may need recalibration. Trying that currently. The long, really long shot is valve stems. In reading the manual, T412 "short" stems are specified. I know the valve stems pass very close to the brake caliper. When my front tires were replaced, the shop installed new long valve stems. I wonder if maybe the long valve stems aren't whiffing by the caliper inducing the wobble. Like I said, it's a long shot. I'll post a fix if I get one.