First. I had a cruiser for a couple seasons a decade ago. I just got on and rode, had no clue how to ride a motorcycle. Have a little time on dirt bikes too. Took Trillian for a ride on a borrowed Vulcan (after it had been rebuilt after I totaled it while incredibly drunk, yep, he put me right back on it soon as his wife wasn't looking.) and next thing I knew She bought the GS500 and Joel told her to get some gear and buy a book, changed my life, thanks Joel.
So, have I reached the mechanical limits of this GS500 or am I a squid noob who's doing it all wrong?
I can put a knee down on the ninja now. By that I mean in a tight circle in a parking lot both left and right side, smoothly, competently and at will. Haven't had the facilities to do it safely any other way.
I can come nowhere friggin close on the GS. I lose traction first. With my 140 rear tire the front slides out on me before I lose the rear. With my new 130 rear which is the OEM size (both Pirelli Sport Demons) I run out of rear tire so they tend to let loose together, front and back unless I'm on the throttle enough to slide the back out intentionally, thus turning the front away from the turn and keeping it on good rubber. In a 'properly executed corner' I run out of traction on both tires before I run out of balls.
Front is an OEM BT45. I got a larger one with the bike but the guy at the dealership refused to mount it, said it would rub on the fender, the previous owner said he knew what he was doing when he ordered the tire. But when I got the bike I put a 140/80 rear on and a stock front. Recently I replaced the rear with the 130/70 (oem size) rear and now I powerslide more easily with less lean angle.
They say oversized tires mess up the handling but I don't see getting more lean angle w/o more rubber front AND back. Especially front. I don't think I'm leaning it over that far. Nowhere close to what I do easily on the Ninja. The ninja has a huge (for it) 150/70 on the rear cuz it was in stock and she likes a fat tire anyway for looks. Even with my knee down it has big chicken strips, it looks cartoonish the way it bulges out of that narrow rim. Haven't noticed any loss in flickability but you could put Goodyears on that thing and I think it would pirouette like a ballerina.
I'm due to mount that front that came with the bike and see for myself if it fits (happy to notch the fender if I have to. Leaving me with a big fat front and an oem rear which I think will do me no good whatsoever till I burn up the rear and put another bigger on the back (they're not selling the sport demon in 140 now)

Problem is I feel tons better sliding on the 140 than the 130. It's amazing what 10mm will do.
Eventually... I'll end up with an oversize front AND an oversize rear(wish I hadn't just got that 130 rear, I believed them about better handling on a stock tire size) and that should buy me more lean angle no? If I do that am I exceeding the mechanical limits of the bike and asking for trouble? Should I just get a more capable bike? I feel good about my natural abilities but I haven't gone out and practiced all that much apart from regular travel but it's hard for me to accept that I can outride that bike already. I really like it's low maintenance, dependability, fuel economy etc. I don't necessarily want to replace it unless I've truly outgrown it.
I also put progressive fork springs in it. Rear shock is stock. I know you can put a GSXR front end and Works shock on it and that's what people who race them do (not a bad idea for sport commuting as insurance is CHEAP on this thing).
Am I already there or did I miss something? I've dissected the Twist of the Wrist II and Ride like a Pro DVDs and Proficient Motorcycling. Ordered Total Control and Twist of the Wrist II paperbacks from Amazon.Freetalklive.com this morning.
All the experts say don't put fatter tires on. None of those resources address my problem.