HI, I purchased an immaculate 2004RT about a year ago with 10,600 miles on it. It has Metzler Marathons on it that came on the bike. They were in very good shape but now are in need of replacement. I have only put 4000 miles on the bike. It was like one minute there was tread on the front and the next it was gone. It is also wearing unevenly with the left side being more worn out. I have been told by a BMW friend that this is common with the 1150 RT's. Is this common? If so, is there anything that can be done to prevent this from happening? Looking for suggestions for a good replacement set of tires.
Your 1150RT is a single track vehicle so, no matter what, the vehicle follows, the front tire. That also means that the only way a front tire can wear off center is if the part of the tire that is wearing is touching the pavement. It won't & can't wear way off center due to air friction.
If you really want to know what is wearing that front tire then just get some help & lean the bike over until the part of the tire that is worn is flat on the ground (THAT is the lean angle that the bike was being ridden at to cause that tire wear).
Depending of the lean-over angle that you determine in the above you can pretty well tell what you are doing to wear that front tire.
If you normally ride down the road with the bike leaned over far enough to have the worn area be on the pavement then you would think you would notice that wouldn't you?
As a rule, most off center front tire wear is caused by cornering & riding through curves. Again, lean the bike over until the part that is worn is flat on the ground, that is the lean angle that the bike was being ridden at to cause that tire wear.
In most cases a rider rides L/H corners/turns a lot faster than the sharper R/H turns plus a L/H turn is also longer than a R/H turn. Most riders also tend to use the same lean angle for most corners & just adjust vehicle speed to keep the lean angle in their comfort zone. Start watching for this & you see that it is mostly true.
Also, in countries that drive on the R/H side of the road L/H curves are longer than the comparable R/H curve due to needing to stay right of the center line.
Road crown seldom figures into (noticeable) front tire wear as the road crown angle is so shallow that any road crown wear falls right on the edge of center tire wear.
You will also find that most BMW 1150RT's have a slight PTTR (Pull To The Right) due to the vehicle weight not centered on the bike's center line (ride with no hands on the handle bars & you will usually see this trait) but again the slight counter steer needed to correct this won't cause a front tire wear off-center far enough to tell it from normal center wear (ie can't cause the 10°+ off center wear most complain about)