06-07-2015, 07:23 PM
(06-07-2015, 02:57 PM)kmoney_imp Wrote: Summer is here and all the "your speed" signs are on the highway. Noticed on longer ride today that these things seem to all clock my speed at about 10 km/hr under what the bike speedo indicates (usually 111 on an indicated 120). All my older bikes (80's) were like this, but figured the digital speedo (assuming it takes it from one of the abs rings) would be better. Don't really care, but wondered if anyone noticed the same.
My old bikes with gear driven mechanical speedos tended to read higher than actual speed (tested with GPS). After I got my CB11 I strapped on the GPS and found that the speedo was within a few mph of the GPS all the way up to 95 mph.
If you've mounted a larger or smaller diameter rear tire, that could throw off the speedo's accuracy. Now that I mentioned that, I realize that I haven't done a GPS check with my 160/60 rear tire. It's about .16" smaller in diameter than the stock 140/70 rear tire.