Doug told us about "teflon powder".

While researching my book on the Iditarod, a sled dog race across Alaska, I was at one stage the guest of pipeline builders inside the Arctic Circle, where it gets really cool. My laptop, an Epson PX8, sold in the States as the Epson Paris, didn't freeze first in the liquid crystal display, as I expected. Instead the case hinges froze. They had just the thing for it: a guy staggered in with a huge barrel of what I was told was graphite grease, good to any temperature in which a human can go out. It worked a treat on the hinges and they gave me a jamjar full that I used every year I went back to Alaska. My laptop survived to be given away to a favourite film producer when I upgraded to a more sophisticated laptop, and from him went to his son, a journalist, for several more years. My pilot also begged an ice-cream tub full, for the same reason Doug mentions --

Get it from a piano tool source. They sell big tubs pretty cheap.
Everywhere else acts like it's gold and they charge a lot for a tiny vial..

-- that airplane supply companies sold small units for $$$$. This so-called "graphite grease" was a pretty thin nearly runny stuff, between your fingers feeling like a fine powder with just enough thin oil to hold it; you could make small ball of it between your fingers but a larger ball would flow and try to coat everything, and it was hell to get of any surface it clung to.

Here's a more easily available and probably more economical alternative: Rohloff's hub service kit contains two oils. One is the "four seasons oil" which is good to -10C. The other is the so-called "cleaning oil", which in a 50/50 mix with the "four seasons oil" is guaranteed down to -30C. See the item "Low temperature/winter shifting issues" at
https://www.rohloff.de/en/service/handbook/faqs/
I can't find the entry now but 100% "cleaning oil" by itself used to be said to be good even lower down. I buy these oils in big tubs because I use them once a year to service my Rolloff box, but they're also sold in 25ml bottles (one bottle is 50ml in size but filled to 25ml, so the used old plus the cleaning oil can be disposed of thoughtfully). This is my dealer:
https://www.bike-components.de/en/s/...=Rohloff%20oil
There's probably also a Canadian Rohloff dealer, or you can get it off Amazon or Ebay.

Mind though, this stuff is low-temp oil, not grease, and the "cleaning oil" is very, very thin*, so Ridealot should first ascertain that his seals are in good order because one wouldn't want such expensive oil to be sloshed out before it has coated all the gubbins thoroughly. Maybe complete disassembly and component coating with a brush is called for.

Me, I wouldn't even try to cycle in such extreme temps, despite having bike transmission guaranteed to go that low.

Andre Jute
Always helpful

*Some of you may have heard that the Rohloff Speed 14 isn't actually sealed to the outside, such lightweight seals as there are being intended to keep grit out though permitting oil to "mist out"; the main misting-out mechanism is a small breather hole in the through-axle shaft. It works because the Rolloff doesn't run in a "bath of oil" like an old-fashioned car's crankshaft. Sophisticated users don't even put in the handbook's 25ml, but only about 15ml, which causes less "misting out". How does the Rohloff stay lubricated then for the 5000km service interval? Both oils stick to the gears like the proverbial to the baby's blanket, and it takes only 12ml to cover the gears completely. It works a treat.

Here's the interesting original exchange:

On Friday, November 23, 2018 at 3:37:03 AM UTC, Doug Cimperman wrote:
On 11/22/2018 3:14 PM, Sir Ridesalot wrote:
If a person is riding their bicycle in -30C (without the windchill factored in to even lower temperature) and they have some intermittent cases where the freehub freely turns once pedaling starts again after coasting; would they be advised t o remove the grease or oil inside the freehub body entirely so that that lubrication does not freeze and cause the unwanted freewheeling?

Cheers

What I've always heard is that you clean out any grease and just use oil.

If the bicycle will be stored in sub-freezing conditions, you could
clean out all the grease and oil and then just use plain teflon powder.
Being a solid powder, it cannot freeze. It does not offer any corrosion
protection from *liquid* water however, thus the always-sub-freezing
condition... (the teflon will tend to drive out any liquid lubricants,
so mixing the two doesn't really "work" like you'd think)

Get it from a piano tool source. They sell big tubs pretty cheap.
Everywhere else acts like it's gold and they charge a lot for a tiny vial..

? Some places note a minimum temperature of -100F for teflon, while
others say -328F ? Either way, let me know how it goes. I'll probably
stay home that day.