A good site if you have a K series motorbike, I've leant a lot of stuff that I wouldn't have otherwise and I've managed to hook up with a few riders to go out on rides with. The site has a lot of useful info and people that are willing to advise and help with any issues.

Having bought a K1200S BMW, I was searching for info on the usual stuff and came across Euro K Club. A great club forum with some incredibly helpful people and some excellent rides /trips being organised all the time. If you have a BMW K Series bike, you should definitely check it out, especialy as it's European wide, so there's a chance to hook up with riders across the Continent as well as in the UK.