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You talking about doing it yourself with teh hot siping tool? Or on stock tires? Its great on ice and snow as its another edge to "bite". If done right it can help tremendously in the rain. Hardcore off roaders seem to be the main ones doing this on their own. I know BF Goodrich offers some tires unsiped specifically so you can cut your own.
sipping is the small "cuts" in the tread lugs of tires. many tires have sipes from the factory for wet tractions. heavy siping (entire lug is cut varing depths but spaced about 1/8 inch apart) is great for winter snow/ice traction. I have used siped tires with great success. they were factory siped nokian hakkapilita Q(sp?) on my wifes lumina and my old ranger and those are the absolute best snow tires I have ever come across) tires with great success. with my ranger just before I sold it I nearly took the tires off the rear cause I could no longer fishtail and have fun with it. It would just simply push the front end around.
also let me just add this.I love siping but I would not like to run them on my truck. 4wd is plenty of traction so matter what. also heavily siped tires will not last as long as lightly siped tires espeially on heavy vehicles. It also depends alot on what type of roads you are traveling, winter yes, dry pavement no way, offroad i have no experience with them off road but would guess for most offroad they would be great.
I agree with TJbeggs. If someone needs to be siping their tires than they either have old tires or are not used to driving with 4 wheel drive. I have never gotten my excursions stuck with 4 wheel.
If you haven't been stuck, you are not driving it in the right places.
A lot of loggers have thier big truck tires siped for running on icey and clay slicked roads. My old ladies tires on her cayanne are factory siped snow tires. They stick well. Also, it is not always about traction to prevent getting stuck. Siped tires can help with breaking and stearing control on slick suraces.
I currently have the Pirelli Scorpions that were Ford's second mistake with the Firestone fiasco and they are siped and the tread is just sliding off...Two different dealers have told me that that is the reason they're wearing so fast.. However my tires on the Suburban were siped wild countries from Les schwab and I had no problems with them and the additional traction was awesome.. The previous Wild countries weren't siped and there was a real difference especially on wet pavement and since I live in the great Pacific NW,that's a plus......
Heres an example of what some hardcore off roaders due to cut sipes in their tires. This tool heats up like a soldering iron and cuts grooves into the tires.
This is an example of a heavily siped winter tire. The tiny lil cuts are the sipes.
tried to answer this last night and got bumped. I was just curios about other peoples opinions on siping. I have the original firestone steeltech tires on my X and they wear like iron, BUT no traction on wet roads and as far as snow and ice as they say back east "Fagitaboutit"! So this year facing many trips across the Cascades I thought I'd try Les Schwab' tire siping , bought a set of chains too just because I know those work. Hell they have never been out of the bag. siping works snow, ice do these things grip and their still wearing well. I'm sold I'll have it done on the next set if these ever wear out. thanks for the replies >