Quote Originally Posted by SimJen View Post
As long as your GPS works in 3d, then the distance will be accurate as.
If it doesn't and you travel up and down then there is no way it can be accurate.
True, but then we don't have many of them hill things on the Canterbury plancake. Spose I might have risen a couple of cm at times. Probably not an issue here.

Jantar, did you ever measure your GS for speedo accuracy. Also, following Cajun's comments, can I get a front sprocket with one more tooth for the GS? - have't even looked to see what size it is. For me it has got plenty of grunt to handle slightly longer legs.