I've got this theory - which might be total tosh - that it depends what bike the tyres are on. I used to use 32F/34R with the Diablo's on my ST which lots of others were recomending but I found them a bit squirmy and soft. I'm now using 34F/36R and it feels much better, I put it down the the fact that the ST is around 20Kg heavier than a 916, 748, 999 etc, so the extra weight would deform the tyres a bit more hence the need for a touch more pressure.
Jools
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