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View Poll Results: to sipe or not to sipe 35" mtrs - used as daily driver and some NW trails.
Yes - sipe them 36 72.00%
No - do not sipe them 14 28.00%
Voters: 50. You may not vote on this poll

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Old 12-08-2004, 09:34 AM   #1 (permalink)
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to sipe or not to sipe MTR's

The wife has new 35" MTR's on her 1982 full size Bronco. she says they do not handle well in the rain. We have always siped the TSL's when we were running those, but I have heard mixed comments about siping MTR's - so here is my question. Will siping MTRs have any benifit and will it improve traction in the rain?

Ritch

and yes I searched this subject first and was not satisfied with the results I found.
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Old 12-08-2004, 09:45 AM   #2 (permalink)
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I used to run big rig in western Wisconsin hauling bulk milk for farmers located on terrible back roads (non-paved stuff) and had to run winter and summer.

Siped tires are at least a 100% improvement over non-siped tires. I could take off on a glare ice hill without tire chains with the siped tires, and not move on the same hill without them. Same goes for rain and rock...

I advise siping at an angle to the tread - not straight on. Anyone that does this professionally will have the correct degree and dimensions.
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Old 12-08-2004, 09:46 AM   #3 (permalink)
 
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Are you sure it isnt your alignment or suspension setup. My mtr's are one of the best tires I have used in the rain, I think they handle great on wet pavement. Ice and snow are another story though.
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Old 12-08-2004, 09:51 AM   #4 (permalink)
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Ask Les Schwabs. LOL They do it and still don't know shit about it! I don't know if siping will help MTR's but it sure should. Every M/T tire I've had sipped has helped out tremendously in the rain, not to mention ICE, snow, rocks, and mud.
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Old 12-08-2004, 10:05 AM   #5 (permalink)
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Quote:
Originally Posted by Malltero
Are you sure it isnt your alignment or suspension setup. My mtr's are one of the best tires I have used in the rain, I think they handle great on wet pavement. Ice and snow are another story though.

It's a bronco - the alignment is always Fawked up. I do have it pretty well aligned currently.
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Old 12-08-2004, 10:43 AM   #6 (permalink)
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I see responses explaining "TO SIPE" but no explainations as to why "NOT TO SIPE". Some insight would be helpfull.
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Old 12-08-2004, 10:46 AM   #7 (permalink)
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how about some pics of siped MTR's as i will be gettin some soon and might be interested in siping them..
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Old 12-08-2004, 10:52 AM   #8 (permalink)
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Sipe them. I've used them both ways in exactly the same conditions and the siped tires always hooked better. Can't tell you diddly about ice and snow, though.
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Old 12-08-2004, 11:17 AM   #9 (permalink)
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Quote:
Originally Posted by nwmud
I see responses explaining "TO SIPE" but no explainations as to why "NOT TO SIPE". Some insight would be helpfull.
Would the wear-rates be different?
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Old 12-08-2004, 11:19 AM   #10 (permalink)
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I started to sipe my 37's, but grooved them insread

I had some 33" TSL's and it did real well when they were siped. I'd say go for it. What can it hurt?
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Old 12-08-2004, 11:44 AM   #11 (permalink)
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goodyear WILL NOT warranty siped mt/r's

yes siping improves traction greatly, its your call on the warranty stuff.
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Old 12-08-2004, 11:46 AM   #12 (permalink)
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Quote:
Originally Posted by stRanger
how about some pics of siped MTR's as i will be gettin some soon and might be interested in siping them..
Youre kidding, right?
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Old 12-08-2004, 11:49 AM   #13 (permalink)
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Quote:
Originally Posted by Sully
Would the wear-rates be different?
i've always heard that siped tires last longer because they run cooler. seems to me that other than the warranty thing....there's no reason not to sipe. better traction, lasts longer, stops better, blah blah
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Old 12-08-2004, 11:57 AM   #14 (permalink)
 
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Quote:
Originally Posted by reeser
goodyear WILL NOT warranty siped mt/r's

yes siping improves traction greatly, its your call on the warranty stuff.
This wouldn't be an issue if the tire store is the one doing the warranty.

Greater tread life is one of the Pros to siping. It increases the surface subjected to wear, reduicing the pressure on each point.

Do you have Discount Tire there? They were one of the first to do it, and seem to know why it is done. At least around here, they seem to know the most about tire tech.
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Old 12-08-2004, 11:59 AM   #15 (permalink)
 
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I've siped all of my tires for the last 3-4 years. No problems with any of the tires, including MTRs.
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Old 12-08-2004, 12:56 PM   #16 (permalink)
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Quote:
Originally Posted by b2dude
i've always heard that siped tires last longer because they run cooler. seems to me that other than the warranty thing....there's no reason not to sipe. better traction, lasts longer, stops better, blah blah

It does indeed help keep the tire cooler and helps tire wear...BUT can also cause chunking, thus lowering the tire life. Mtr's tread isn't really bulky enough to "chunk" anyway, other than maybe some corners.

Just get them siped, there really are no downsides for a dd.
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Old 12-08-2004, 01:17 PM   #17 (permalink)
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Quote:
Originally Posted by b2dude
i've always heard that siped tires last longer because they run cooler. seems to me that other than the warranty thing....there's no reason not to sipe. better traction, lasts longer, stops better, blah blah
I thought that siped tires ran HOTTER.
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Old 12-08-2004, 01:55 PM   #18 (permalink)
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Originally Posted by braxton357
...BUT can also cause chunking, thus lowering the tire life. Mtr's tread isn't really bulky enough to "chunk" anyway, other than maybe some corners.
My MTR's have chunked on me. That would be my only worry about siping, the increased chance of more chunking. Other than that, I'd go for it.
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Old 12-08-2004, 03:08 PM   #19 (permalink)
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Quote:
Originally Posted by reeser
goodyear WILL NOT warranty siped mt/r's

yes siping improves traction greatly, its your call on the warranty stuff.
I get ALL my tires from Discount Tire and buy the extended warrenty through them. They cover the warrenty not Goodyear thius way and they reccomend the siping. Of course they do the siping too. My tire warranty is good for the life of the tire no prorating like so many other places.
Plus they only sipe the center traction areas so that should cut down on chunking too.
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Old 12-08-2004, 04:11 PM   #20 (permalink)
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Just leave 1/2" inch of the trailing and leading end of each lug unsiped and that should keep things from chunking. There is no reason NOT to sipe nobby tires, it just makes them so much nicer on a DD. I don't know why you would think the MT/R's are any different................ at the end of the day, they are just another on/off-road tire.
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Old 12-08-2004, 06:23 PM   #21 (permalink)
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The ones I have siped I go from one end of the tread block to the other about 1/4" apart from the last one. Try to keep them 1/4-3/8" deep and they always worked well that way. Takes a shiatload of time (utility knife) and a sharp knife and a warm/hot tire.
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Old 12-08-2004, 08:42 PM   #22 (permalink)
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sipe em'. i did mine with a regular box knife and it sucked. it took me like an hour a tire. and i did two in one day, then didn't get to the other 2 until two months later!! i'd definitely pay to have a machine do it.
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Old 12-08-2004, 08:49 PM   #23 (permalink)
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Don't waste your time or money. The biggest problem I have seen with sipping your tires is that the kid who is doing the siping has no idea what he is doing and I have seen a set of tires get shredded on the trail because they were sipped to deep and the store that sold the tires wouldn't replace them because the tires were used "off road". Don't waste your $$$$$$$$
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Old 12-08-2004, 09:11 PM   #24 (permalink)
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Then find a different shop to do it. Shops that sell semi tires and retreads typically do, and they'll know what they're doing...
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Old 12-08-2004, 09:46 PM   #25 (permalink)
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Go for it. It really does help. Especially if you ever plan on seeing any compact snow or ice. I work at a Goodyear store and I've run MT/Rs with and without. Just don't have the shoulder blocks siped all of the way through.
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