Nitetimes wrote:brian_bp wrote:.....and runs wide single rear tires with massively incorrect offset, placing the load inches outboard of the intended location (and leaving the brake discs hanging out in the open, instead of in the inner wheel). I suspect that they are running the rear axle way under its rated capacity, so they can get away with this.
Looks like what they are running are standard dually wheels on the back which would put the hub face out the back of the wheel. What makes that a poor setup is that the front wheels aren't the same offset requiring you to carry 2 different spares.
Actually the setup is all wide singles (Michelin XDA2 295/60R22.5, nearly a "super single"), so I think their single spare works at both ends.
Normally a super single is used only at the front, on a special wheel which has the "half dual spacing" offset of a normal dual wheel, but is wider... so wide that you can't actually mount it in a dual pair (the rims would hit, since the hub face is within the wheel, or at least too close to the rim). 295 mm is not hugely wide, and the XDA2 is intended for use in dual applications on larger trucks, but it is enough wider than common dual tires on a F-550 that the stock dual wheels wouldn't work... it needs 9" wide wheels. That works fine in the front (if there's room for a tire that wide), since it retains something near stock offset and is the right width of wheel for the tire.
In this case, the same size tire is used in the back. It looks like they are also using the same 9"-wide wheel, but mounted in the opposite way to the front, so it looks like a standard dually wheel in the outboard position; this does put the hub face out nearly out of the back side of the wheel. If that's true, it's the same tire, same wheel, and same spare for front and back.
A pair of these tires can hold up the entire weight of the rig, so my hope is that the horrible offset (maybe as much as 7", while it should be about zero) is okay because the rear axle is not used anywhere near its normal capacity... and that was the point of my example.
