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Unread 12-09-2013, 11:50 AM   #1
1222
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KM2s and siping?

This discussion started in another thread in the JK tech section that was starting to highjack the original Ops thread. Thought I’d remove them from that thread and put them here.


Quote:
Originally Posted by ROCKR8R View Post
...I also wouldn't put KM2's. They run smaller than most other tires and do poorly in really wet and snow conditions as they have no siping. Just my .02

-Dan
Just to clarify it’s the KMs that have no siping; the KM2s do which is a huge improvement in wet conditions over the previous KMs.


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Unread 12-09-2013, 12:25 PM   #2
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My KM2s aren't siped.
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Unread 12-09-2013, 12:46 PM   #3
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Then what do you call the cuts in the tread?
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Unread 12-09-2013, 02:15 PM   #4
ROCKR8R
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the KM2's aren't siped.

-Dan
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Unread 12-09-2013, 02:19 PM   #5
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The large "cuts" in the tread is just the design, those aren't cuts at all or siping. Fine lines within a tread block like in the Duratrac is siping.

-Dan
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Unread 12-09-2013, 04:54 PM   #6
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I know itís the design of the tire but always thought of them as built in siping from the factory. Anyhow I gave BFG a call a couple of hours ago and asked what the groves in the KM2s were called. I was told that the groves in the tread blocks were siping. Hereís their number (1-888-871-6666) if anyone cares to call them.
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Unread 12-09-2013, 05:30 PM   #7
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Interesting. I always thought those grooves were wear indicators because they're at different depths. Half way though the tire life the grooves disappear so the siping doesn't seem too effective.
image-2631784617.jpg

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Unread 12-10-2013, 02:32 AM   #8
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KM2s and siping?

Wow, I’ve been through a few sets of KM2s but never worn them down that far. My tires always started to cup way before that; most likely my fault because I never rotated them.

I’m far from a tire expert but I’m thinking that if one was to add more siping to a mud terrain tire that I doubt they would go much farther than what you see on yours. The reason I say that is because the lugs would probably lose chunks a lot easier than what the factory designed into them if grooved too deep.


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Unread 12-10-2013, 12:27 PM   #9
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Goodrich may call those sipes, but from what I've read on this forum, don't make the KM2 an effective wet road/snow & ice tire. My Grabber AT2s are good all around ATs, but they wouldn't be so good in mud and they only have 2 ply sidewalls, and I'm thinking the 3 ply sidewall KM2s with real sipes added would be a great off road tire for year round DD? Anyone doing this?
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Unread 12-10-2013, 12:37 PM   #10
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The "siping" on the outside of the tread on.the km2s, which I know isn't really siping....beware, when that wears down, they do lose a bit of traction. I learned that at a stoplight in the rain (the first rain after they'd worn); luckily, I could just go through it, once I realized I want stopping.

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Unread 12-10-2013, 01:06 PM   #11
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Well maybe itís not the traditional siping you would see on a passenger tire or an all-terrain but isnít it sniping none the less? The KM2s are a huge improvement in wet road conditions compared to the original KMs which have absolutely no sniping/grooves.
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Unread 12-10-2013, 01:19 PM   #12
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Quote:
Originally Posted by 1222 View Post
Well maybe it’s not the traditional siping you would see on a passenger tire or an all-terrain but isn’t it sniping none the less? The KM2s are a huge improvement in wet road conditions compared to the original KMs which have absolutely no sniping/grooves.
Yeah, I agree & I've been very happy with my km2s here in rainy FL.

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Unread 12-10-2013, 01:21 PM   #13
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I ran KM2's on my 2500HD and came from a Bridgestone Dueller HT and noticed no adverse effects on wet pavement traction even with the lack of "sipes". The extra grooves still allow water to channel and give more road contact than the previous KM. They are leaps and bounds over the KM1's which I also ran and were like lollerskates.

Not a good direct comparison though since that truck had a mile long wheel base and IFS so its rode manners were great. My Jeep on the other hand will lose traction and slide the back end around if it even looks like rain outside. Currently running Grabber AT2's on it, I attribute the poor wet weather performance to the light weight and relatively short wheel base rather than the tire.

I also live in the rainiest and wettest part of the United States (which might surprise you is southern Alabama we average 72" of rain a year) so I drive on a lot of wet roads.
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Unread 12-10-2013, 01:23 PM   #14
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My jeep grips surprisingly well in the rain...I usually have to provoke it to get it loose. There are times when it does it on its own, but for the most part mine behaves well in the rain

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Unread 12-10-2013, 02:18 PM   #15
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I had KM2s. The factory has grooves in them.
I also had KMs.

The KMs were siped and it made a MASSIVE difference in rain, ice, etc. Assuming the rubber compound is similar, I think if you paid to have them siped at a tire shop, you would also see an improvement. Mine were done with an Ideal heated knife by me in my garage.

In the attached picture you can see the shiny dark part is where the blade heater ran, on either side of that I had a 5mm deep cut that opened up and grabbed a lot of bite on slick surfaces. I only had minor chunking at worst, and a marginal increase in noise with the sipes. If you think about it, in the right conditions you have effectively tripled the number of biting edges.
img_0088.jpg  
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