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Unread 10-28-2014, 09:57 PM   #1
christensent
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How Much Does Siping Help

I have a '14 rubicon in the Northwest where it rains every day for the entire winter, and those stock tires are going to kill me. I drove home at night in rain the other night and even going 20 under on the interstate, hydroplaned three times once completely losing control and swerving through the lane for a few seconds.

I'm planning on getting 35x12.5's (already have 2.5" lift installed). I offroad quite a bit and will be using it in deep snow, so I really need MT's. But first priority simply has to be not dying. It's pretty much only a recreation vehicle since I have no commute, but it has to get me to the trail and home!

I've been looking at either the Baja MTZ or Open Country MT since they come at least somewhat factory siped. I'm also not opposed to adding a bit more siping myself.


Does this really make a significant difference over the unsiped stock mudtires? Or is it only going to be ever so slightly better and still suck bad in the rain? I know they're better when siped, but nobody really talks about just how much better.

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Unread 10-29-2014, 09:10 AM   #2
biffgnar
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Sipping will help alot. Although going to 12.5" wide tires will not help.
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Unread 10-29-2014, 01:15 PM   #3
Charley3
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Siping gives a huge improvement on wet roads, and especially Winter roads. Like 10x better on ice, and maybe 3x better on wet pavement. Those numbers are subjective, but that's my opinion based on my experiences.

However, the other issue is tire width. Narrow tires are better on wet roads and Winter roads because they don't hydroplane as much, and they dig in better for traction on Winter roads, and especially because they don't side slip as much on Winter roads.

The narrower the better. The more sipes the better.

Can you get a better tire in 255/75R17 or sipe one?

I live in the same region, climate, and terrain you do.
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Unread 10-29-2014, 01:28 PM   #4
ChrisHager
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Have a look at this video:


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Unread 10-29-2014, 01:45 PM   #5
Charley3
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That's an awesome video.
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Unread 10-29-2014, 10:21 PM   #6
christensent
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That video is awesome! Makes me think I'll be able to get by if I sipe some mud tires. I'll do it myself so they don't get trashed lugs from a siping machine.

Quote:
Originally Posted by Charley3 View Post
The narrower the better. The more sipes the better.

Can you get a better tire in 255/75R17 or sipe one?
That's the same size I have now, I want more diameter for better clearance and performance, and more width for deep snow performance (which is my actual application of this jeep). Unfortunately I know these are both worse on road.
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Unread 10-30-2014, 12:23 AM   #7
AntiPrius
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That video is far from awesome. It compares a slick strip of rubber, and I know of no one that uses slicks on their Jeep, to one, not even with sipes, but one with deep cuts. That video is a joke and I hope other than the last two posters, well I should say last 3, everyone else give this much more thought as to what they really saw happen.
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Unread 10-30-2014, 08:09 AM   #8
christensent
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Quote:
Originally Posted by AntiPrius View Post
That video is far from awesome. It compares a slick strip of rubber, and I know of no one that uses slicks on their Jeep, to one, not even with sipes, but one with deep cuts. That video is a joke and I hope other than the last two posters, well I should say last 3, everyone else give this much more thought as to what they really saw happen.
Although not identical cases, it does show that for a flat strip of rubber (effectively one lug of a mud tire), siping that lug will cause it to gain vastly better traction. Since it's merely a bunch of these lugs in contact with the ground, I would argue that actually yes, the video does mean a lot.
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Unread 10-31-2014, 12:12 PM   #9
Charley3
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I wish the guy had used a little fish scale to pull with. Then the difference would have been quantified with numbers.
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Unread 10-31-2014, 04:29 PM   #10
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Quote:
Originally Posted by ChrisHager View Post
Fascinating.
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Unread 10-31-2014, 05:13 PM   #11
IslandTJ
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Boat deck shoe soles are siped and they absolutely work.
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Unread 11-14-2014, 07:57 AM   #12
bbacus
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Don't sipe your MT's

If you really need water/snow traction buy the appropriate designed tires. Siping is primarily for snow traction, where water traction is done both with siping and tread designed to move the water out from under the tire.....look at Bridgestone Blizzaks if you need this type of tire.
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Unread 11-14-2014, 08:03 AM   #13
ChrisHager
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I understand (and agree with) buying the appropriate tires for the situation but for vehicles that see occasional street use, siped mud tires are perfectly fine. Here's a snippet of a post from my J-10's build thread. Mind you, my J-10 does better in 2WD (rear) in snow than my WJ does in 2WD (rear). My J-10 has siped knockoff Maxxis Bighorns. My WJ has DuraTracs.

As you can see, they only sipe the center tread.

Quote:
Originally Posted by ChrisHager View Post
Also, for those who are curious, I snapped a few pictures of the siping I had done last fall. The front and rear were done the same. I think the rears show more wear as they're the drive tires. I probably should rotate them to keep everything even.

Rear:







Front:





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Unread 11-14-2014, 08:46 AM   #14
wilson1010
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The problem of having the absolute wrong rubber on a tire, the exact opposite of what works on slippery surfaces is not affected by siping. I think its a "feel good" measure that means nothing in actual practice. And, certainly for Washington State in the winter it won't begin to make you safer.
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Unread 11-14-2014, 11:13 AM   #15
Wheelin98TJ
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I had a set of old style Goodyear MTRs that I had siped during winter months. I noticed a difference.

I also had a set of Mud Grapplers siped. Did not notice a difference with them.
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