the 182 is for wider sprockets using 525/530 sprockets. And the D183 is for the smaller versions needing 520 pitch chains so I guess slightly thinner and lighter
Ok thanks. I have just bought a 530 chain and now looking for a 42t sprocket. Seems there’s a shortage at the moment
I junked the 530 set up and went 525 which opens a whole load of sprocket choices rather than the standard 530 set up