I have an identical "wobble" in my front end. 13 GS-WC with cross spoke wheels and Tourance Next tires. Inflation pressure always kept at factory recommended 36/42 psi. First noticed it sometime shortly after the 600 mi. service even though I suspect it was always there and I didn't notice it because of the newness of the bike. It occurs starting around 40mph up to 60mph and then no wobble all the way up to 130mph. The wobble is more pronounced during deceleration than acceleration. It is much more pronounced if hand pressure is lightened or removed from the bars (hand pressure is acting as a damper.) It occurs in all riding modes and damping settings with different loads on the bike and the windshield in different positions. It occurs on straight smooth roads as well as twisty back country roads. The bike now has just over 4,000 miles on it. At 1,840 miles I took the bike to my dealer to have the wobble checked out. A very experienced BMW mechanic spent about 2 hours checking it out and test riding it. They rebalanced the front wheel (it was only off by .25 grams) and said they could not find anything wrong. I've recently returned from a trip and am waiting for my dealer to let me know what BMW will do next to correct this. While I was away another customer of the dealer with the same bike as mine reported the same issue. When the dealer contacted BMW and asked them if they were familiar with any issues like this the said NO. They then asked if the wobble occurred around 60mph!!! Guess they HAD heard. BMW is going to try replacing the tires with a different brand for that customer (tires not yet available.) Haven't heard back from BMW yet on my situation. I've owned many BMW's and never experienced a front end wobble in any of them.Got to say I'm a little disappointed, and that wobble is annoying as hell.