front sprocket
 

:hismiley: all i changed my font sprocket for a 14tooth one.Will this make my speedo reed faster or slower than i am actually going.?:104:

Your speedo will be over reading with a 14t, i usually assume around 10percent for safeties sake.

Your speedometer will show a higher speed than your actually driving. On my bike it shows 10-15% wrong, so when the meter says 100 km/h, my real speed is around 85 km/h, according to my gps.

Thanks mates perhaps i am ok for exceeding the speed limit then.:100:

You will be doin 25 if you do 30. Easiest way to check is run thru one of these 'your speed' radar thingys they attach to lamposts, that's what I did. At 65 speedo I was doing 60 so is just 5 mph at all speeds on mine.

Changed my 15 to a 14 a few weeks ago only got out yesterday to try it,not for me!!! shortens the gearing too much,I rarely use first gear apart from when I drop it in by mistake,it pepped the engine pick up a touch but I felt it lost the flexibility on the road,oh well you have to try these things.

Just to be different I went the other way and run a 16 tooth. Transformed the bike for me especially at low speeds, no more snatching and makes 1st gear very usable and still OK throughout the whole range. I have an X so no off road stuff.