Hi there everyone! Just thought I'd let you know that I replaced my 14T/42T stock sprockets to a 15T/41T as my first mods. I now have a decent 1st and 6th gear. The speedo has gone from 3kmh under to 3kmh over so I will need to install speedohealer or equivalent to correct it. On the GPS in 6th, I now cruise at 6500rpm at 100kmh (62.13mph) and 7100rpm at 110kmh (68.35mph). The figures seem to correspond to the 15T/42T setup at gearingcommander.com more so than the 15T/41T setup. Interestingly, once I reach 110kmh, the ECO comes on and stays on. Pickup is definitely a bit more slower than stock, though because I usually give it more throttle, I don't have an issue with it. I can just keep it in 1st a lot longer than before. Then objective of this was to drop the revs as I intend to do more long distance runs. If I feel the urge to rev away, I can drop it to 5th. As my bike is stock standard, I wouldn't go 15T/40T, as it may be a bit too much for the bike (I'm also 75kg). Those with tuners and aftermarket exhausts shouldn't have any problems though. You'll probably end up staying in 5th if you love revving the bike and leaving 6th as an overdrive gear. I also found that I now change at 5500-6000rpm as a sweet spot for this mod. If you love revving the bike in general, then stay away from the 41T on the rear altogether. Cheers!...