Mine's around 50mm - though I didn't do it myself. Since having the thing serviced last week, I've been told one of the road springs has basically broken, and so I'm actually looking to raise it by 10mm or so. Whether this has happened because it's too low, I don't know...but I doubt it's helping. Picture here: http://lh5.ggpht.com/_yPW0651Kc54/SpLUxNRyShI/AAAAAAAAAEA/MfFjTylO6Uk/s720/2009-08-24%2018.54.50.jpg