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hiley2 · 12-25-2013, 05:11 PM

I want to take my 3.15 off front axle and put on tag ...anyone done this? 2004 essex.

Crasher · 12-25-2013, 06:39 PM

Quote:

Originally Posted by hiley

I want to take my 3.15 off front axle and put on tag ...anyone done this? 2004 essex.

Why?????

hiley2 · 12-25-2013, 07:01 PM

Fronts are 3.15s, only 10,000 miles, tags are cracked and need replacing and are 2.95s. Want to put new ones on front and move slightly used ones to tag.

Sky_Boss · 12-25-2013, 07:04 PM

I have to agree with the question...Why?

What are your current tire sizes on the rear and how much weight is on each end? My 43' DSDP has 305/70s all the way around. The drive wheels need less than 80 PSI and the tag wheels don't carry enough weight to require more than the minimum 75 PSI. Assuming you have 305s on the back, I don't think you would be much different from that. Putting 315s on the rear would mean I (perhaps you also) would be running on balloons.

The only situation I see where you might need more load on the tag axle is if you have a heavy motorcycle and lift on the rear. I'm not even sure that would push the tag wheels to the max.

I would ASSUME you would also need to match wheel size between the drive and the tag axles. I *THINK* different tire sizes might present some tricky air bag height adjustments between those closely spaced axles. Not so sure on that, though.

Finally, it sounds like you want to reduce the size of the front axle wheels. I might be reading that wrong. Regardless, if you did, that would not make ANY sense at all. I'm looking at if it is possible to increase the size of my front wheels from the 305s to 315s. My 305s will handle my front axle at 115 PSI but they tend to ride a bit harsher than I like. As they warm up, they get hasher.

Crasher · 12-25-2013, 07:32 PM

How much weight is on the tag axle? Probably less than 8-9000#. That's less than half of the 315 capacity. They would not flex much at 80 psi and might ride rougher. Do you have the same wheel on the tag and steer axles? How old are the 315 tires? I don't think I would do it to my coach, but you should contact Newmar for the correct answer.

Sky_Boss · 12-25-2013, 07:38 PM

Quote:

Originally Posted by hiley

Fronts are 3.15s, only 10,000 miles, tags are cracked and need replacing and are 2.95s. Want to put new ones on front and move slightly used ones to tag.

I am assuming you have 295/80s. The 315/80s have a diameter of 42.3" while the 295s are 41.3". The taller 315s behind 295s might scrub a bit harder in turns.

Listen, I don't have any scientific reasons to say you can't. I'm just thinking it doesn't feel right to mismatch the drive & tag axles wheels.

The one thing you have going is that they both have the ability to be used on either 9.00 or 8.25 rims.

In the end, I am not sure you will gain much of an advantage going through the process of swapping tires. The 315s will be more expensive...I think.