Post by
philipa_240sx »
https://forums.nicoclub.com/philipa-240sx-u68765.html
Fri Dec 05, 2008 5:39 am
Well, what can we say... we are all very passionate about our cars!
There is some truth about narrower winter tires being better. Going back to my racing days and some of the classroom lessons....
Generally for a given vehicle and various tire widths, the surface area of the contact patch is the same. It just changes shape. As tire width increases, the tread becomes wider in width and shorter in length. However a tire is not static, it also moves and flexes under various loads.
On dry pavement, wider tires are preferred as the much of the grip comes from the leading (front) edge of the contact patch, esp at the limit of adhesion. Is the tire gets wider, the leading edge increases in size improving grip. Yes, I do agree that wide tires on dry pavement are preferred.
On snow however, it is a different case. Grip comes from compacting the snow to form ridges that it can 'push off from'. This compaction is a function of pressure and time. A wider tire has a wide contact patch and short length. The wider tire is effectively having to compact more snow in a shorter period of time vs. a narrow one. As you increase speed, the amount of time the wide tire spends in contact with a given patch of snow decreases further, compacts less, and those ridges don't form reducing grip.
Back to the original topic:
The Rogue's sometimes poor snow performance is largely a function of the OEM tires. It's anybody's guess why Nissan chose the Conti's or the Dunlops. They (like many all season tires) are horrible in snow. Properly equipped with winter tires (I recommend the narrower 215/70R16 width of the the base model) however, the Rogue IMHO is a very good in snow. It has far less weight than the typical full size 4x4 which really helps in stopping and turning. It's a far cry from my 4000lb '87 Nissan Pathfinder SE-V6 4x4, all that weight was a PITA to slow down and turn. I would take the Rogue hands down over the Pathy during winter.