grit dog,
many tire dealers that sipe, will not do the outer treads, only the middle tread area. Yes I do agree, that if a given tire does not have a lot of built in micro sipes, this added siping does help the tires gain or add traction in many places.
The toyo proxy tires on spouses ML320 have been siped. Major difference in handling and traction siped vs not siped.
I've also noticed this in my Navistar with the typically a 5 rib hwy in the front, the steering handling and tracking is better when the tires are siped, vs not.
On the other hand, a tire that has many micro sipes built into it at the factory, adding the sipes does not IMHO, always pay for itself, in better handling. Its harder to tell the difference in other words. So why pay the money to do so.
marty
