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Unread 08-28-2013, 05:44 AM   #1
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2003 TJ Wrangler 
Join Date: Dec 2012
Location: Edmond, Oklahoma
Posts: 41
Airing Down

I'm running 33x12.50 KM2's on 15x10 wheels. Going to play offroad this weekend, and will probably need to air down. How far can I safely go, without worrying about busting a bead? I would assume that I can't get down as far as if I had 15x8 wheels.

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Unread 08-28-2013, 06:12 AM   #2
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1999 XJ Cherokee 
Join Date: Aug 2006
Location: Cincinnati Ohio
Posts: 1,637
De-beading varies greatly depending on the terrain. a long slide down a muddy off camber hillside, pushing mud up the sidewall will debead almost any tire with 12 psi or less.

Straight ahead on rocky terrain one should be safe down to the 10-12 range.

If you lower your road psi from 32 to 16 you will double the surface area of the tire on the trail. That is usually enough for most guys.

Also, learn how to re-bead the tire on the trail. Good info can be found by searching this forum or post a question as a separate topic and you'll get a lot of info.

I think the wheel width means nada compared to the tire pressure as a factor in de-beading. Think about it. With the tire off the rim you can compress the sidewall with your fingers. Does it matter that the rim is compressing it another inch when a 10 inch rim is compared to an 8?
03 Rubicon; 99 xj with too much stuff to list; Unimog 406
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