I plan on changing my rear sprocket out on my SMS630, from the stock 38 to a 41. Will this have a big effect on my Speedo? If it does is there a rough guestimate i can use to figure out my actual speeds or is there a speedo healer that's compatible with this bike? Appreciate any help.
As Willie says... Swapping out rear tire has no effect on speedo. Changing the tire configuration from SM 17/17 to TE 18/21 changes the size of the front wheel, and so does impact the speedometer . The speedo has an option to switch between the two front rim sizes. I've run with a GPS mounted speedometer and have noticed a 1-2mph slippage between the tire-based sensor and the gps, but its mostly pretty good.
