cheers guys ill look at the suggestions.

I'm looking the teneres speedo to be correct, 70mph on the clock reads 61mph on GPS which is massively out, that and I've a few long distance rides coming up and want to be able to cruise a bit better and sit at a real 70mph.

Did this mod on my old R and had no issues and it basically corrected the speedo to GPS accuracy

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Plough on