Doug, yes sir, most of that patina was from mountain biking
I am going to take a moment to explain my strong passion for carbon steel. Its going to be long, but only because I respect you all enough to take the time. I also respect your preferences so none of this is to go against those.
From the time I was a kid my father always took me hiking in the woods. It was the number one activity. He bought me an ontario 1095 machete some time in elementary school for the walks. I carried that thing in a canvas sheath EVERY single time.
Growing up with it I learned to use a machete for everything, eventually fast forward to when I got much more into knives I also got very into sharpening.
I tried super steels and the such. What I found was I could get a geometry and an edge on my 1095 ontario that I could not match with the supersteel stainless. If I went as thin the edge would start to warp in hard wood. Anyhow, I bought a bunch of Ontario's and a belt grinder and a few hundred dollars worth of belts and compounds etc.
Here is a quick video of why I love my simple 1095 in a machete. It just works. The times I have hit concrete the edge was not destroyed.
[video=youtube;fX95Kil5t0s]http://www.youtube.com/watch?v=fX95Kil5t0s&feature=plcp[/video]
I learned to sharpen with diamond stones, arkansas stones, edgepro, belt grinder, wheels and on and on. What I found was every steel responded differently and I used to have specific compounds I would finish steels to and certain grit belts I would stop at etc.
Then I came back around to traditionals with 1095 steel. I pulled out my older arkansas stones and gave it a shot again. I was able to experiment and find just what I like. I don't touch my traditionals with a grinder and there is no need to go to diamond. So, I decided, KISS
It has been challenging at times to keep rust away and Frank (knarfeng) graciously explained to me what a patina really is. Yes, it is rust, I now understand this.
Here is my 85 recently in the rain
Here is was at the beach getting constant salt spray for a few days
Here it was along for one of my many mountain bike rides, as you can see no strong patina yet
Here is my old mountain bike, never had any trouble with rust
What I found was it takes a really really thick patina to keep red rust away on the really humid rides or days out working. It took a few rides on 100+ days with HIGH humidity to make my 85 rust. I was so drenched that when I jumped in the river I actually felt like I dried off. I had to take Carl's advice on this one and I just let it go. I spit shined off the rust and kept working and kept riding. The patina got darker and darker and thicker and thicker. No more problem with red rust after this.
Then the other problem I was left with was the freshly honed edge having no protection. This is when I switched my compound on my strop. An old barbers strop with linen and horsehide. I used to use dry compound but I switched to waxed so that when I stropped it also left a layer of protection. It has been working for me ever since, with the only signs of corrosion being microscopic, literally.
I hope this helps explain my love for carbon steel. I probably left a ton out, but I tried to recap quite a lot that got me to where I am with it.
Kevin