I have 390mi on my new bike now and there seems to be a minor stutter in first gear somewhere between 2.5-3k rpm and only in that gear. I noticed it when riding home from work earlier this week and it's been raining and will continue so I won't be riding again until later next week to investigate more. The stutter just comes on for a second while accelerating in first gear and then disappears and I don't remember it doing that in second. Maybe it's just break in rumbles and from what I've read here I wouldn't be surprised if it's gone by the next time I ride. We shall see.