Hi, I need a new chain for my Ninja 250R. I’ve been looking at RK chains but not sure which one to buy. I know the 08+ 250R use 520 pitch – 106 link chains. RK make the following chain series: SO - rated for street bikes up to 400cc XSO - rated for street bikes up to 750cc GXW - rated for street bike up to 1000cc. DID chains with similar max bike cc rating are also an option. I know its overkill but can I use GXW (or similar Superbike rated) chains on the little 250? Is there much of a weight difference? The price difference is acceptable. It will be matched with new OEM sprockets. I just want chains and sprockets that will last the longest with proper maintenance.