Another, another which wheel. MRAP on a 550?

#1
Reading Beef Cakes build thread. And again like Java I'm still looking. At my local tire shop I saw a new 19.5" tire from Toyo that isn't even listed on their website. Its a nice aggressive 245 70 19.5 but over $650.00/tire. I found MRAP wheels and adapters right next door here at Western Canada Rockwell. Does anyone know if MRAP wheels have the required offset to run as singles on a F550?
 
#2
I talked to Western Canada Rockwell in Red Deer which is right next to me. They make adapters' for $80.00 Canadian each. I talked to them About the MRAP and sounds like they'll work. Since they're so close they told me I can come and try a set they have and see how they fit.
 

Cowpig

new guy + questions
#6
the aluminum 2 piece military wheels are surprisingly light - i have the stryker wheels like in Beefcake's build, they're way lighter than the steel inner 22.5's i ended up using, and about the same as the alcoa aluminum 22.5's. too bad they weren't the right backspace for a kodiak/topkick but i hope to use them on another truck someday
 
#7
the aluminum 2 piece military wheels are surprisingly light - i have the stryker wheels like in Beefcake's build, they're way lighter than the steel inner 22.5's i ended up using, and about the same as the alcoa aluminum 22.5's. too bad they weren't the right backspace for a kodiak/topkick but i hope to use them on another truck someday
Do you know if there's much difference between the Stryker and the MRAP in offset? The fellow at WCR said that guys reverse the inner mounting plate on the rim for the rear wheels and you can also mount the plate inside or outside the rim to gain or loose a little as well.
 

Cowpig

new guy + questions
#8
yes you can mount them either direction to change the offset - unfortunately on my kodiak doing that with the stryker wheels moves the fronts further out and the rears further in so it staggers the track front to back rather than helping. I don't know the difference from stryker to mrap though, but there are other combos and adapters available for the military beadlocks - for instance there are steel beadlocks that exist for my rig (bolt pattern/hub bore) that are zero offset and would be perfect ... but they're very hard to find (there was a guy on ebay selling them months ago for $500/ea .... at the time i thought that was ridiculous ... i'd buy them in a heartbeat now)

not sure how the offset on the 550's works but Andy (beefcake) will chime in I think he's back home by now
 
#9
yes you can mount them either direction to change the offset - unfortunately on my kodiak doing that with the stryker wheels moves the fronts further out and the rears further in so it staggers the track front to back rather than helping. I don't know the difference from stryker to mrap though, but there are other combos and adapters available for the military beadlocks - for instance there are steel beadlocks that exist for my rig (bolt pattern/hub bore) that are zero offset and would be perfect ... but they're very hard to find (there was a guy on ebay selling them months ago for $500/ea .... at the time i thought that was ridiculous ... i'd buy them in a heartbeat now)

not sure how the offset on the 550's works but Andy (beefcake) will chime in I think he's back home by now


Thanks For the info. I hope Andy jumps in. He has some real world experience there. As soon as I get my box back on I'm going to go to Red Deer to see WCR and try fitting some wheels/tires then I can decide.
Don
 
#10
I have some MRAP aluminum wheels, Hutchinson part # 1326. These are 10" rim width, 4" offset and weigh 75 lbs.
I believe your F550 rear axle overall width is 74".
The center in these wheels is 1" thick, so if you mount them with the "big dish" out, plus the center thickness, plus say a 1/2" adaptor you get an effective offset of 5 1/2" (4 + 1 + 1/2).
This means wheel centers at 85". Plus width of 335/80R20 (13") means 98" overall width.
If you mount the adaptor "inside" the wheel, then the offset would be 4", so overall tire width would be 95".
Note also that in normal duals, the load on the axle bearings is "centered" between the duals, at axle width, 74". Going wide singles moves this load out to the center of the new wheel - about 85" or 82" depending on the way you mount the spacers. This will put added load on the bearings.
Not sure what front axle overall width is, but say 90" for sake of calculation (substitute actual number).
Mount wheels "big dish" in, with 1/2" adaptor plate gives offset of either 3 1/2" (4 - 1/2), or 5" (4 +1" center thickness) depending on which side of wheel center you bolt adaptor plate.
So wheel centerline would be 90 - 7", or 90 - 10". 83" or 80".
Add tire width of 13 gives 96" or 93" overall width (assuming 90" overall axle width).

I think this calculation is right.....

I think the Alum MRAP wheels at 75 lbs are not too bad. These are the ones with the CTIS (see link). The stock steel wheels are about 65 lbs (but don't forget the additional weight of the adaptor....)
There's also a heavier wheel at about 90 lbs.

https://www.ebay.com/itm/20-X-10-MR...MILITARY-4X4-6X6-CTIS-WHEEL-RIM-/182740568762
 
Last edited:
Top