Ok so its probably been asked before - but I did a search and didnt find anything conclusive. I realise tyre pressure is a fairly crucial part of my bikes handling so a couple of quiestions: 1) How often do you check? (I'll commuting 15km each way 5 times a week - so not doing a whole lot of kms - but I still figure I should check the pressures every now and then... ) 2) What *is* the correct pressure? All I can gather from poking around on www is a front somewhere between 28 and 35psi and a rear around 32-35psi? - Anyone care to suggest any better numbers for my ZZR? Does it depend on the tyre? Is it written in an ancient mystical secret code on the tyre? 3) Are servo forecourt airlines/guages good enough? Are there any differences? - Lots of bikers seem to stop at our local BP (The Gap, QLD) - but theres a Mobil down the road that also has air - ... could there be wide variances in accuracy of their guages? or is the difference in patronage just a bikey cultural thing?! 4) How do you tell when a tyre is due for replacement? Is it just a tread depth thing? are there any clear indicators that its time? I dont think I have a tyre problem - but I'm keen to make sure that I'm on top of tyre maintenance before I learn the hard way that I dont have enough grip!