Originally Posted by FBinNY

BTW- for those who do ride in the rain a lot, the number one best way to improve chain life is to use fenders with a mud flap, or at least a front fender. Spray from the front wheel hits the chain edge on with driving force, scrubbing it dry of lube quickly, and blasting road grit deep into it.

If fenders aren't for you, (I don't use them either), make a note of where the worst of the spray passes next time you ride through a puddle. If it's right on the chainrings, you can sometimes move it away by changing the width of the front tire.

I get very mixed reports of lube service life from folks who ride in the rain, I suspect fenders, or the angle of spray are the reason for the big variation.