From: Sonny Heath (sonny@defuniak.com)
Date: Sat Mar 18 2006 - 19:54:25 PST
But IS it safe to put radials on the eight stud set up?
Sonny
----- Original Message -----
From: "Darrell Ramsell" <daram@comcast.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Saturday, March 18, 2006 1:28 PM
Subject: [MV] HMMWV rims
> Hi Sonny
>
> I've decided to reply to the list because I thought the information will
> be useful to others.
>
> There are 3 types of the two piece HMMWV rims. One eight bolt (lug studs)
> & two 12 bolts.
>
> The eight bolt rim (lug studs) was designed for the bias tire and the two
> piece magnesium run-flats. The two 12 bolt rims (lug studs) rim was
> designed for the radial and the one piece rubber run-flats. The reason
> the military switched to the 12 stud is because the extra 4 bolt give
> added strength to support the higher PSI rating of the radials (Bias tires
> have a max PSI of 35 & 50 for the radials).
>
> Now you can put the bias tires on the 12 bolt rim but it is not
> recommended because it's not designed for the higher psi rating. Someone
> also mentioned that the bead could possibly pop off the rim if you're
> doing some serious. However, I had radials on a 8 stud for 2 years and
> never had a problems but I've done only minor off roading.
>
> Now I mentioned that there are two types of 12 bolts, old and new. It's
> pretty easy to tell the difference. The newer one has an alignment hole
> on both the outside and inside rim. This also prevents the two type of
> rims being mixed together because they have different weight ratings. The
> old 12 bolt is rated for 3,400 lb and the new one is 3,850 lb. These
> ratings are stamped on the rims.
>
> When you put the two half together you need to make sure they are aligned
> properly. The new 12 bolt makes is easy. You just stick a fat
> screwdriver thru the holds to line them up. The older 12 bolt need 3
> special alignment washer that go between the two rim. They need to be
> space equally apart in a triangle pattern to make them rims line up
> properly. Now, it is possible to put the two rims together with out them
> but if you don't get it right your tires will wobble when you drive. As
> for the 8 bolt rims I'm not aware if they require anything to line them up
> straight.
>
> Another thing you need to be aware of are the O-rings. Each type of rim
> have there own O-rings. You'll need to make sure you have the right one.
> They are all pretty much the same but with some minor differences. With a
> little effort you can tell between the 3 O-rings. For the 8 bolt it's a
> bit thicker than the 12 bolt. The two 12 bolts look almost the same but
> the new one has a red stripe on it. As someone mentioned earlier, it is
> recommended to replace the rubber O-ring that goes between the two rims
> whenever you change the tires. Some people like to add silicon grease to
> the O-rings for a better seal and to keep the rubber from drying out but
> I've seen people do without it too. I really don't know which is the
> better between the two.
>
> I also mentioned earlier in my earlier post that there are two types of
> run-flats. One is the 2 piece metal magnesium and the other is the 1
> piece rubber. The 2 piece goes on the 8 bolt rim and the 1 piece goes on
> the 12 bolt. From my understanding the two are not interchangeable. The
> military switched to the rubber one because I assume they felt it was less
> of a fire hazard. I'm sure you know that once magnesium starts to burn
> it's impossible to put out.
>
> Well that's about all the information I have on the HMMWV rims. If you or
> anyone need pictures, I'll be glad to send them to you. If you need more
> information, KASCAR can help you out. I learned most of what I know from
> them. You can still order HMMWV parts from them but it is restricted now.
> From my understanding they'll only sell you HMMWV parts that are
> compatible with the H-1 but not parts that are specific to the military
> HMMWV. The only way they can tell you what they can sell is that you send
> them a list of part then they get back to you as to what they can give
> you.
>
> Darrell
>
>
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