I ride in temperatures up to -15C but that limit does not have anything to do with how my Mojo copes with the cold. The reason for the limit is that it is not fun anymore to ride when temperatures drop to below -15C.
The sag could miraculously increase a few minutes after you left home... Last winter I went out into temperatures up to -10°C. This year I only went trekking overnight when it suddenly turned -15°C whereas the weather report still said -5°C. Generally, it´s not so much a problem for the bike, although the suspension might feel a little odd and slow.
When the ground is frozen stiff in these temperatures, you´ll get the best grip ever during the year. It´s just plain fun to ride like this.
I find that around 20 degrees, the fork oil starts thinking it is honey and the rebound damping becomes waaaay slow. The Mojo is a champ in the New England weather. I was out last week when it was 8 Farenheit (-13 C) - no Mojo issues.
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