You need to clean your chains more! And that's coming from me (I've been known to get through 4 chains some years)!as well as looking at pulleys, was surprised to see corrosion on shimano HG71 chain (inner plates), that I just took off , and, tried to clean,
versus, the previous SRAM870, which, I will be putting back on, until the arrival of my, first ever, KMC, X8(full metal jacket)
the shimano and sram, both ~£14 were just nickled on outsides.
typically 18 months use, 2 winters, for each chain, commuting.
Obviously it's pretty impossible to use the above for comparison, the 870 could have avoided road salt during it's winters, or you just happened to clean it more doing so. The Shimano may have sat with more salty wet road grime on it for longer between a couple of rides and got corroded from it. Compare the mileage you got from each to judge, the condition of how bad the outside plates look is probably fairly useless to estimate wear of the inner links...
Although I do like SRAM chains and have generally found they give me a few more miles than KMC/Shimano over bad winters.
Depends what you're riding and what you're looking for. Hard wearing? Fast rolling? Great grip?Thinking of replacing the Bontrager R1 tyres my bike came with, but not really sure what to go for, anyone got any recommendations for good tyres? Currents are 25mm, but I believe I can fit wider on there so may look at 28mm