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Old 04-01-2015, 02:23 PM   #1
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Tire spacing help

I have a 2013 Silverback 29RL with the factory 235/80/16 Master track tires. I am planning a 4k trip and would like to replace the tires with Michelin XPS ribs size 235/85/16 or 245/75/16, my concern is the spacing between the tires. I called Dexter and they say 1 inch is sufficient but that seems close to me, I called Cedar Creek and they say to stick with what is on it. I know that with the 7k axles you get the LT235/85/16 what I don't know is if the axle spacing is different with 6k axles??? Mine are on 33inch centers .
Has anyone done this on a Silverback with 6k axles and if so what size did you go with and how does it work out

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Old 04-01-2015, 07:03 PM   #2
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I can't answer your question on the Silverback but I did install Michelins XPS Ribs on my 318SAB Cougar that I traded in on a new CC34RL this year.

The Cougar had the 6,000 LBS axles and the 16" tires from Dexter Mfg. CO, the axles are the same so the spacing between the axles should be the same also. My tires that I replaced were ST235/80R16 Power Kings and I replaced them with Michelins LT245/75/16 tires. What I did was compare the rolling radius against each other and discovered that there was enough clearance between tires.

I installed them three years ago and was one of the better upgrades to the camper that I did.

Do not forget to have them balance also these are very heavy tires.

Jim W.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67
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Old 04-01-2015, 07:26 PM   #3
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my 2014 29 re silverback only has about 2" of spacing. I was worried about going larger diameter so i decided to spend some money on a tpms and hope for the best. Im good friends with the owner of Kal Tire in my home town and he told me all ST tires are made overseas and they are all crap. Prob is the LTs as you know are taller and thats an issue for us silverback owners
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Old 04-01-2015, 08:56 PM   #4
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I put XPS Ribs on my Everest before buying our CC. Best decision I ever made. They are the best tire I have found on the market. When you lift the LT then lift the XPS you can really tell the difference. I had 1 inch clearance between the tires and ran this configuration for 3 years. Worked great for me.
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Old 04-01-2015, 09:16 PM   #5
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Not from an RV, but my (now sold) gooseneck equipment trailer came factory with the 235/85R16's on 33" center to center. There isn't a ton of space between the tires, inch or a hair more. Owned it 5 years and never had any issues. If you have enough clearance up top for the extra height I wouldn't worry about it.
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Old 04-07-2015, 10:05 AM   #6
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I just swapped my Michelin LT 235 85 R16's off my SOB to my new 33IK. I have a bit over 1.5" clearance with no issue yet as far as tires rubbing in a tight turn. I don't trust the China Bombs on the heavier fivers.
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Old 04-07-2015, 10:46 AM   #7
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Good for you, it looks like Cedar Creek would still offer the LT as a option

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Old 04-13-2015, 04:25 PM   #8
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As long as they can not possibly touch is all that matters. If at the end of the day with the worst absolute suspension flex and chassis flex. Result in the tires being a 1/4" apart at that moment, you are still fine.

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