[Coloradobus]

Overlander63,

The spare goes behind and beneath the bath room counter. The 245X75X16 tire is too large acrossed, top to bottom and side to side to fit. Depth-wise there is plenty of room. Vertically, its too tall to fit under the counter edge and the floor, and too wide, so it hits the plumbing to the bath sink, while just clearing the van's wall on the left..
When removing the old tires, we discovered one was a 225X75X16, and the rest were the 245 series. The 225 series will fit in the spare's spot. I would find it odd that Airstream would equip the van with a different sized tire for the spare. The old tires had to go since they had a build date of 40th week of 1996. The smaller 225 tire was dated 38th week 1999. So it was several years newer than the other 3. We trailered this B-Van home 1330 miles, behind our SOB motorhome.

Thanks Wingfoot, we might have to consider a tire carrier. But the whole point of an interior mounted spare, was to allow a bike rack in the Van's receiver hitch. Guess we try Plan B.