I'm getting a very pronounced 'click' from the bottom bracket area when pedalling up hill. I can also feel it through the pedals. I've replaced the pedals to no avail so I'm assuming the crank bearing is starting to fail. The bike isn't all that old (bought new in October 2010) but I have covered a lot of miles on it, mostly over tracks and by-ways so I'm not really surprised. I've never replace a cartridge bearing before... are any special tools needed and is that bearing unique to Wisper or are replacements available from any good bike shop? Any advice will be much appreciated.