Alignment problem

[kolot]

86 , I have been using the Azzaro / Storm combo for 4 season now, as most know the Azzaro wears around 6000 but sticks well. I have noted a lot of cupping on all of them but now seems the tire is wearing mostly on the Left side in the rear
  and I have noted the storm is wearing more on the right side in the front. I think the bike is crabbing down the road.  Not noticeable to others following me, but the tire wear is rapid and quite uneven. Any ideas or procedure to check alignment.

[kolot]

Here's the rear with Left side wear

[Jim __]

A few of easy checks would be swing arm bearings, equal fork height in the triple clamps and wheel bearings.  And probably should check the steering head bearings while you have the front wheel off the ground.

[JDM]

You could snap a chalk line on the garage floor, center the front and back tire on this line. On the back wheel, perpendicular to the axis of the bike, select a distance (measure) from the forward part of the tire sidewall and make a mark on the floor. Measure and mark the floor the same distance from the back of the tire sidewall. Snap another chalk line through those two points, if the two chalk lines are parallel it's tracking straight. Make sure you measure from points that are at the same elevation on the back tire sidewall. The further apart the two points are the more accurate your layout will be. HTH JD