Hi guys,
I just adjusted my chain today as it was kind of slack and think it could be about time to replace it and the sprockets but would like a second opinion. Here are some pictures of the teeth on the rear sprocket, as you can see they are slightly curved which I believe means that its due for replacement?





I just had a look at the service history and the chain and sprocket were replaced about 12k miles ago.

Also could anyone give me some tips as to how to align the rear wheel properly? I had to completely remove my adjuster nuts as they were stuck together so when replacing them I had to go by the markings on the swingarm but I am led to believe they aren't always accurate.

Any help will be much appreciated thanks!