Lot of good info here! Were I live the temp change so frequently that
I usually ride on frozen and badly plowed bike path and roads in the
morning and in snow slush back. Like mentioned studded tires are a
must here so another vote for the Nokian Mount&Ground. They are heavy
and with the extra resistance far from swift. But the studs sit in a
four row configuration, cheaper tires have only two, so they bite in
corners making them great for MTB-ing too!
Studs sit slightly off to the side so inflated to 3,5bar dry roads
don't wear them down too fast (mine are 3-years and still have great
bite!). The more severe conditions are the less air I use, going as
low as 1,85bar.
For road bikes I think the new Marathon Winter are a great tire. Four
rows of studs, tighter thread and a lower weight.  From what I heard
they use the same make of studs as Nokian. Tried a set of studded
IRC's in the 90's but they were crap as the studs disappeared into the
rubber!

On 30 Jan, 18:09, John McMurry <johnmcmu...@gmail.com> wrote:
> On Jan 30, 11:01 am, Sean Whelan <strummer_...@yahoo.com> wrote:
>
> > I was never a mountain biker, so most of my attempts to ride in the snow 
> > usually end up either with me staring up at the sky from a cold an painful 
> > landing on the street, or teetering on the verge of collapse at less than 5 
> > mph.
>
> > What do you folks do?
>
> > What tires at what pressure?
>
> IMO, there is no winter tire that excels in all conditions.  I find
> the Nokian Mount & Ground tires to be generally very good winter tires
> for most winter conditions that I cycle in.  They're sized  559x45mm
> and I run them between 35-45psi, depending on conditions.  They
> perform very well when temps are very low (15F to -25F), with up to a
> 4" snow layer, dodging (and hitting) snow cookies, the occasional
> sidewalk detour (when conditions warrant), and on light snow covered
> ice.  In a few other conditions, they're overkill: so smaller tread
> blocks, a narrower profile, and less studs would perform better.
>
> When snow is sticky, thickly rutted, and has a slimy base, (temps from
> 20F to 35F on an unplowed, paved surface) I prefer a slightly narrower
> tire at a higher pressure and less and/or negative tread.  The wider
> tires I've used (including the Mount and Grounds) tend to half float,
> half sink in that stuff and your wheels constantly drift.
> Additionally, the snow packs up into the tread, making pedaling much
> more difficult, and traction minimal.  These tires excel at most other
> conditions though, and so, I'll continue to use them on my commuter.
>
> I've also had the following experiences riding these tires in the
> winter:
>
> Panaracer Pasela 622x37mm and found them to be a great winter tire for
> when roads are better maintained, but no studs meant cornering was
> tricky and sometimes dangerous.  Not so great getting up steep, icy
> roads.
>
> Continental Town & Country 559x57mm and really liked that they didn't
> pack full of snow and provided pretty good traction, but again, were
> unstudded and found they floated a bit too much in the loose stuff.
>
> Nokian A10 584x36mm and find them excellent tires on most winter
> rides.  They're better than the Mount & Grounds when roads have been
> plowed, they're worse when AOT is on strike.
>
> Regarding winter bicycle riding, the best advice I can give if you're
> having problems getting going is to: keep pedaling.
>
> Momentum will get you through most everything, except corners.
>
> John McMurry
> Burlington, VT
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