Noticed a little more tire wear on the left side of the rear tire, not the extreme left , but the left just past center of the tire.
I have several K mile on it so whatever it is it isn't extremely wrong.

My first guess is that the rear axle might need some adjusting. Just trying to determine which way to go with it.

 

I don't know where you live, but here in Texas our roads are crowned pretty well to get the water to run off of them. This leads to the left side of tires wearing faster than the right side. I run a family owned bike shop and see this daily...

What bike are you on?

 

Put your wallet in your other pocket on ever other ride. HA..PS..Add a signature in your profile as to year,model and full ID similar as you see on my bottom line.

 

this is on a 1999 Softail custom, with a Metzler 880

 

Entirely normal for all 2 wheelers in the US. You scrub more rubber in L turns than in shorter R turns. Left side countries experience the opposite.

 

Yep, I can vouch for that!

06 NT, 95", S&S .510g, V&H 2-2, K&N AC, P&P heads, SEPST

 

Sounds right.
Scott

 

Due to the pipes on the right, softail riders typically don't lean as much on right turns. Along with what the others have said, if it applies, it's still a good idea to check the alignment. If you can get a good, straight 2x4 or similar, lay it against the rear tire's sidewall, as high up as you can, and see if it ends up parallel with the front tire, and adjust if necessary.

 

A Softail rear does not align with the front with adjustment. The rear adjusters aligns to within 1/32 of the swing arm bearings but mostly to the front drive pulley. (when correct, the belt will rub lightly on the flange on the rear pulley) The front aligns with the rear with the handlebars.

 

If you are only considering that 'one' aspect, There is also checking how parallel the wheels/tires are in respect to each other....has more to do with left/right bias or offset.