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Grooving or siping 19.5 tires

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Old 10-12-2017, 12:13 PM
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Grooving or siping 19.5 tires

Thinking about grooving or siping my tires before winter. Taking all 6 off the truck to paint wheels next weekend so will do it then if I do. Coworker races dirt cars and has grooving (remove .2 inch wide strip) and siping (no rubber removal just multiple razor slits) tools I can use.

Here is a picture of my rear and spare tire. My fronts are same design as pare but better condition. Thinking about grooving out the red about 1/3 to 1/2 tread depth or siping the green (probably more slits just drew 2). Looking to improve traction for this winter and thought I would try it out. Tires are older and will likely replace in the spring before my trip to AZ and would rather try it first on the old before "new" ones.

Any thoughts?

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Old 10-12-2017, 12:29 PM
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I think that adding more sipes to the sipes already there, as indicated by the green lines will probably weaken the rubber too much and allow them to chunk and break off from the tread, especially since they are older tires and already show indications of the tread chunking.

Why do you want to add more sipes to the tire?

Stewart

Last edited by Stewart_H; 10-12-2017 at 12:31 PM.
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Old 10-12-2017, 12:46 PM
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Hoping to improve traction for the winter. The truck is my only vehicle now. Before I always had a car and truck driving the car in the winter. I ran a dedicated winter tire on a few of them and was impressed. Thinking that additional edges would help. No real problems with what I have but willing to experiment. Well except for the screw I picked up in a front this morning.
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Old 10-12-2017, 01:57 PM
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Quote:
Originally Posted by brandon_oma#692 View Post
... but willing to experiment. Well except for the screw I picked up in a front this morning.
Ah! I gotcha now.

Well, except for the screw you picked up...too...

Stewart
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Old 10-12-2017, 02:13 PM
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Good news. Screw did not puncture tire just stuck in tread. No plugs
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Old 10-12-2017, 02:16 PM
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I think siping is a good idea but I don't think I would groove them.
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Old 10-12-2017, 02:31 PM
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I had some tires siped a few winters ago and it worked pretty well. Only problem for you may be that they have been on the road. I was told at the time that they would not do tires that had been driven due to gravel, sand ETC. embedded in the tire will destroy the "knives" that make the cuts.
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Old 10-12-2017, 03:45 PM
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Regarding Siping, ONLY do the CENTER 2 or 3 ROWS on the tire, this will prevent chunking of the outside lugs. You don't want to sipe the outside edges. Regarding grooving them a lot of off road guys use electric chain saws with a depth gauge on them but typically they only go off road. Siping makes a big difference, I did it to 2 sets on my Jeep when it was my DD. What about just running snow tires? This time of year there's all kinds of them on CL for cheap...just a thought. Edit: never mind just saw the 19.5.
Les Schwab will sipe them for about $15 each...
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Old 10-12-2017, 04:55 PM
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Not doing the outside rows makes sense. That was the plan on the front but didn't think to not do the outside for the rear.
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