Stupid bike speedometers...

Or, actually stupid me...So, I get a my first tri bike and I switch my bike computer thingy from my old hybrid bike to the new one.  My average speed immediately goes from ~15 to 16 mph to ~17-18 mph!!!  Today, I notice that the milage is off from what it should be on the route I am riding...and then it hits me...I must need to re enter wheel size and all that crap! 

Anyway...I will figure out tomorrow what my accurate average speed really is...I guess I am not Lance Armstrong...but I was for a few days!!