My softtail never has lost a #

 

If that is you on the picture the lighter bike and loads don't seem to have much of a problem when it comes to loosing air. Your total load is probably much lower then the max tire load . That is why the front tire last much longer then the rear.
Of course the pinot gallery will say what about spinning & excelarion and all that. Yes But load is the main factor in tire ware. The more load the more air you need. But do not exceed the tire max pressure.
In most cases we exceed the tire maximum load so we should always put max air. 140 Dunlop I think is 750 load max 42psi 140 Metzeler 750 load max 50psi
In your case Youre about 180 lbs all wet and your passenger about 120 lbs bike about 360 total 660 80% of the load is on the rear tire. Your rear tire load is about 528 lbs you can probably get away with 36 psi in your rear tire
You loose air is when you exceed tire load and you keep tire pressure at max. We notice that all tires seem to level off at from 32 to 36 and you hardly ever loose air at those pressures. Perhaps tire runs hotter and seal better.
Now we are talking tub less tires. Tub tire don't loose much air but if you run them under inflated you will burn the tub.

I was looking back. Sorry our club onboard tire compressor Vs Portable was not the rally survey I pasted the rough page. I will find a copy and post it.

 

Now we are talking tub less tires. Tub tire don't loose much air but if you run them under inflated you will burn the tub.

 

I was looking back. Sorry our club onboard tire compressor Vs Portable was not the rally survey I pasted the rough page. I will find a copy and post it.

What do you keep your rear tire pressure at? What kind of mileage you get from your rear tire? do you have tube tires?

 

I've got one of the cheapo Slime pumps, and dispute the claim that they are for people who only worry about inflation when the tire is flat. On the road I check pressure each morning before that day's trip. Although I seldom have to add air, the Slime does the job just fine when air is needed. An onboard tire inflation pump is solving a nonexistent problem.

 

Interesting in some ways but whats the deal about can't run the engine? If your engine won't run whats the sense of inflating the tire?

 

Could you post a complete comparison of the portable compressors you tested, I would be more interested in that as I am looking for a new one.

 

I carry a portable from Wal-Mart. Haven't needed it yet but it's available if and when I do.

 

No doubt! I am a big boy and Ride the RK fully loaded often. I check air regularly when I do maintenance or wash. I almost always check it cold, on the occasion I check it warm it is usually a bit higher which makes sense to me. In the two years I have been riding this particular motorcycle I have only had to add air once and that was because the new tire I mounted on the rear didn't come with air in it. So, WTF, are you a Savior 250PSI rep?

 

I'm with you Scrooge. I have the Slime pump, use it when I need it, and dont stress over the details. As a backup, I keep a CO2 system and a patch/plug kit for the times that things dont go the way you want them to.

I'm in no race to air up a tire, and dont need anybody telling me I need to carry an oversized, overpriced air pump along just so I can keep my poser status. I do just fine all by myself, thank you.