Replaced the rear Metzeler with a Bridgestone 020 Battleax 79v rated. The Metzler front tire has plenty of miles left so I chose to leave it on and wear it out.
The problem that I am experiencing now is that upon initial take off, the bike has a shuddering effect, a wobble if you will, from side to side until the bike gains some speed. It seems to oscillate in the same manner as the shape of the tread design of that new Stone. However, it seems as though the problem is up front.
I posted earlier that I had similar experience with a new Bridgestone rear and lightly used Metzeler front. The wobble was slow but noticeable from a stop to 2-3 mph and from 2-3 mph to a stop. Before changing the rear tire, I had the 45 mph high-frequency wobble that has been reported here by many people. That HF wobble disappeared with the new Bridgestone rear.
I replaced the front Metzeler with a Bridgestone BT-020, drove around a little bit, and the low-frequency wobble seems to be gone. So, I am back to wobble-free for now and very happy about it.
I have seen several posts here about running the Bridgestone rear with the Metzeler front over the past few years, and thought I would try it. Funny how as soon as I did that, and noticed the oscillation/wobble, there was a thread started about this very thing.
Original Metzelers did not wobble, but the three sets of Metzelers since then all did the 45 mph thing. Several people have posted that the wobble is not a big deal if you just keep your hands on the handlebars, but I've never bought that argument. It's not supposed to do that, and just because I can damp it manually doesn't mean it's OK. The wobble may be pronounced at 45 mph, due to some harmonic frequency being reached, but the problem that is causing it is always there, and is wearing out the tire(s), bearings, damper, etc. Plus, it annoys me...