My TC29D measures 87 inches to the top of the roll bar and I have R4's. So, the 87.8 inches with ag tires sounds about right. That's about 4 inches over what would fit in a standard garage with a 7 foot door. I think New Holland should have thought this one through better. I don't see how that 4 inches is adding any significant amount of safety, so they should have lowered it 4 inches so it would fit in a standard garage. Actually, it would be safer because now I tend not to bother to put the roll bar up half the time, whereas if it would fit in the garage I would leave it up all the time.