Been looking at chains/sprockets for when i have money. Bit confused about the difference between a 415 and 520 chain, what, if any, is the difference?! not in terms of one is bigger than the other thats obv. but in terms of usability, i had a google but cant actually find anywhere that explains it without an anorak approach! Don't need the science behind it just an overview of the differences!
thanks
Geo