Was very surprised at the results of recent rear sprocket change. With original 45 rear my top speed was 159klms, that’s with tall screen and top box. Now with a 48 rear sprocket it hits 176klm .In fact I think it may even manage to make it to 180 but I wasn’t prepared to hold it at full throttle for too long as it kind of wobbles around a bit.
So, I was expecting a lower top speed, but, It’s not so, quite a surprise!

Have you got a speedo healer? Cause if you dont the speedo will be reading out incorrect values, and with a larger rear sprocket you will be being given postive speed values, ie speedo says 40mph, where you probably only doing 35mph!!!!

same idea if you put a smaller front sprocket on, means you need more turns of the front sprocket to turn once at the rear.

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Plough on

If you take a look at this utility from Ranni - it will give you an idea of the speed differences with various gearing ratios.

http://ranni.altervista.org/xtx/

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XT Modifications - XT Supporter's scheme

No actually I haven’t got a speedo healer. After reading your replys I feel like a bit of a goose. I don’t know how many times I’ve read the threads on the Speedo healer I can’t believe I didn’t realise that’s whats going on, how embarrassing. I must have just got excited today when looked down and saw a 176. Thanks Maxwell/Montacio
Dan

I get 184-185 km/h with 14 front sprocket. I don't have speedo healer either, so it goes less actually. I need to check with GPS the real value. But with my current setup, I think this bike can go 200 km/h with different ratios...

It will be interesting to see what your GPS reads. If you could post the results when you have them, that would be great.
Dan

192 km/h

riding with my GPS one day I did up to 170 on the clock while the GPS read 160km/h. My top speed in general has been 181 on the clock (standard sprokets always) so I guess my real top speed is about 168-170km/h

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I saw 173kmph the other day there on a 06 wi 78k klicks on it

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1st post of 2007, 2008, 2009 & 2014 gold star award

But I must be getting old because over about 130km/h I get scared and close my eyes...