While taking the wheel out to get my new tyre fitted, I noticed that the ceramic speedo sensor was broken. I know the little ears normally break off, but they were fine, a piece of the cylinder part had come away.
I got a new one on order but fitted the broken one as I needed the bike to the commute to work. I thought it would either work or not, what I got was a working speedo that read low. 6k revs in top is a smidge over 70mph usually, today it was reading 50mph at 6k.
New one should arrive today so will get fitted over Christmas, just thought I would share.