I was wondering what pads people think stop best in the wet. Specifically I'd love to know % increase in stopping distance you get from your favourite wet weather pads, and what disadvantages (if any) you pay in pad life, etc.

Oh - and this was the best info I could find online. From 2005:

https://www.koolstop.com/TechReviews.php

kool stop salmon. works good wet and dry. not sure about extra wear but mine have been on my bike for 3k with no issues.

% increase in stopping distance??

no one is going to be able to give you data like that in this forum. i echo the salmon pad suggestion, they work good wet and dry, and i too have about 2500 miles on my bike with them and they look and work fine.

Swissstop Green Flash FTW, in any conditions. Only downside is price.

I'd have hoped for at least a decent estimate - like 25%, 50%, 100%, 200%. I'd have put the Shimano's I'm used to at around 100% - which looking at the link I gave seems about right. If someone doesn't have a crude figure like this in their head, then how can they ride safely in the wet?

Yes, the feedback on the salmon koolstops seems uniformly positive all over the Internet, even if the Tektros did edge out the Kools in the test I linked to. Good rain pads now seem to be down to around a 25% rain penalty - a huge improvement over the junk I've been riding. They have a reputation for being kind to rims too.

without a doubt, the limiting factor for me in the wet is the friction coefficient between my tires and the road; much more so than my brake pads and the rim.

i can easily lock up my front wheel with my brakes, in wet or dry conditions, same with the rear, the difference is that i have less road grip when its wet, which is what effects stopping distances most, in my experience.

if you go with the koolstops, and you have at least decent calipers, i suspect you will find the same.