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Unread 08-21-2013, 04:30 PM   #1
hustler905
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2002 TJ Wrangler 
 
Join Date: Mar 2010
Location: Canada, Eh! Aboot here!, Ontario
Posts: 3,604
How much runout is too much?

I have some Falken Rocky Mountain AT/s tires (285/70/17 on JK Moabs). They have a bit of runout, and I know it is the tires because I "tested" them by placing each of the tires on the back axle, putting that on jackstands, and finally idling the Jeep in 1st gear.

The rim didn't have a hop.
The line near the tire bead didn't have a hop.
The tread has a hop to it, about 4mm (something like 1/8").

I have about 27,000 km (17,000 miles in American) on these.

What does the JF Brain Trust say is acceptable?

I know the obvious answer is "if you can feel a vibe then it's too much" but is there a spec somewhere? It seems that lowering tire pressure made the hop less apparent. Is that as good as it gets when it comes to mitigation techniques?

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Unread 08-22-2013, 10:50 AM   #2
WXman
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2001 WJ 
 
Join Date: Jun 2003
Location: Kentucky
Posts: 3,005
From what I've read, anything over 15 on the road force numbers is getting bad. When I ran 285/75-16 Falkens, I fought with them constantly to keep them balanced. Never could get a totally smooth ride out of them. Those tires are just too heavy and have too much thickness to them. That's a good thing on the trail but it sucks for the highway.
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Unread 08-22-2013, 11:54 AM   #3
hustler905
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2002 TJ Wrangler 
 
Join Date: Mar 2010
Location: Canada, Eh! Aboot here!, Ontario
Posts: 3,604
I think in this case it's just a Falken thing. That being said, they were inexpensive compared to other tires.
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