My chain has almost no slack and is very stiff. Iíve not used the bike since the lockdown, however, after my last ride I used the usual spray of Bananaslip wax. Today, I put the bike on the stand and spun the back wheel for 5 minutes and the chain seemed to ease off, but it still only has about 5mm of slack. The chain was fine the last time I used the bike, so should I take the bike out and hope the slack comes back or re-adjust the wheel to give more slack before using it. The bike is almost 2 years old and has done 13k. It seems to be in decent condition and there is no rust. Any advice is most welcome.