I use to have an XTR and for ages ran the standard 15:45, but started doing alot more long range riding and found the speedo to be quiet out with my GPS.

I changed to 15:42 and found that yes it did require the engine to be revved a bit longer to make a smoother gear change or not bog the motor down when you changed down a gear but wasnt really a problem really. But this was with a stg1 filter and cans.

I then put on a Stg2 filter and kev fuel mod and the acceleration was back to if not above standard 15:45 setup acceleration. I found the standard XTR hard to sit at an indicated 70mph with standard gearing but after the gear change and the stg 2 filter+kev mod found that i could now sit at a proper 80mph for a good hour before mainly wind blast got annoying.

But why not drop the speed and enjoy a different route?

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Plough on