It drives me nuts. A Speedo DRD, model U1 may fix the problem but its not a plug and play solution like the DRD is for most other bikes. It works like a charm on my V-Strom. I may bite the bullet here pretty soon. No excuse for it really.
Its law in most countries that speedos do not underread , so to cover themselves for someone putting on different sized tyres or whatever, all vehicle manufacturers make the speedo overread.
Consensus for the GSX S seems to be 6%, although some of the figures stated here don't tally with that.
I once had a ninja 250 speedo that read 100 when my actual speed was only 83, it took me a while to work out why I always had traffic banked up behind me.
Once you work out what how much the difference is it's not really a big deal, I just mentally add it on (and the police tolerance) to the speed limit and go that fast instead.
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