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Old 08-19-2022, 12:16 PM   #1
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315's or 365's for steer tires?

Hello
Replacing tires all around...
I have 2018 Dutch Star 4018 - it has 315's all around, but the 4369 and other 43's have the 365's for the steers (same chassis with room for the 365's). Anyone else changed to the 365's in front? I know that I would need the wider wheels. Trying to find out before I leap (for a change) if with less pressure required to carry the same weight, will the larger tires give a softer ride over the potholes and expansion joints??? At my front end's weight of 15,050, the 315's need 110# and the 365's only need 85#
Newmar and Michelin won't give an opinion, but Newmar did say that the 365's would fit...
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Old 08-19-2022, 12:53 PM   #2
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Added to the 365 front tires you will need a 10 inch special rim. Having owned 3 HL Newmar's with 315 and 365 front tire you would be best staying with the 315's which can care up to 18K on the front.
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Old 08-19-2022, 12:54 PM   #3
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I switched to the 365s but it was because of the front axle weight. My loads were right at the top of the 315s capacity. By going with the 365s that gave me more of a safety margin. The wider tires do put more load on your steering box and i don't think there is any real noticeable ride change.The 315s are easier to get on the road if one had a problem. The 365s have good specs and do handle the loads better but that's assuming you have the load.
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Old 08-19-2022, 01:02 PM   #4
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Changing the rims and tires for aesthetics is up to you personally. But if you are doing it for functionality, like it was said previous, you can carry more weight, you will still be around the 110 psi and they are more expensive and harder to allocate. But they should fit like Newmar said.
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Old 08-19-2022, 06:10 PM   #5
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Stick with the 315ís, the 365ís make bumps and expansion joints rough.
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Old 08-19-2022, 06:25 PM   #6
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The coaches above the 4018 in length all have a 10K generator and obviously more coach, consequently they need the larger tire. I don't think I would change them out unless there was some weight issue you're experiencing.
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Old 08-23-2022, 10:29 PM   #7
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Thank You

Thank You ALL for your replies!!!
Sure don't have a weight issue at only 15,050 front axle weight - was just looking to soften the jarring from the rough California and other State's lack of Interstate road surface maintenance...
Decided to stay with the 315's...
Did something radical for me - I have put Michelins on all five motorhomes over the years - yesterday bought 6 Toyo's (2 steer and four drive left the tags alone) from Les Schwab in Medford with the understanding that after a long test drive this next week, I'll either buy 2 more Toyo's or buy 2 Michelins thru them (although they are almost impossible to get)... They are buying my used Michelins at $150 apiece, so it made a $2200 dollar difference total from Michelins thru local Michelin dealer who wouldn't trade in my old tires.
It is interesting that the Toyo's weigh 30#'s per tire more and have deeper siping - just have to check the air pressure in them and give those steers a good test before deciding...
THANKS AGAIN!!!
Bob
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Old 08-25-2022, 10:57 AM   #8
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Bob, add a pair of Koni EVO shocks to the front end. They will eliminate a LOT of that short jarring that makes your front shades dance while you drive. I'm always looking for things to tame the California roads. The shocks also took some of those big thuds and changed them to softer thuds, where you may hear them, but not feel them.

Lastly, set the new front tires at the MINIMUM for your axle weight. 5psi can make a difference.
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Old 08-26-2022, 09:13 PM   #9
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Hi Don

Hi Don
I did just have the newer supposedly self-adjusting Koni Evo's installed with the complete alignment at Henderson's in Grants Pass (a Spartan approved...). Trying to save a buck (never works) had the alignment done at Freightliner Northwest here in Medford - said that they do Spartan, but the results showed otherwise - scuffed what was left of my fronts in no time and still had to work the wheel...
Now "All is well" - goes straight, tighter feel and you are right - quieter... Felt like a traitor, have always used Michelins, but just couldn't justify the price difference especially with the local Les Schwab giving me $150 per tire casing trade-in.... So far (only about 300 miles mixed interstate and county roads) have been quite satisfied with the Toyo 144A's and their balance beads (had always thought that was hocus pocus), but they really settled out after a couple of drives...
Thanks again for your and others' suggestions...
Bob
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Old 08-26-2022, 10:40 PM   #10
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Which Koni shocks did you buy and did you put them on all axles?
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Old 08-27-2022, 11:19 PM   #11
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A little history......many years ago I added Koni FSD's to my Monaco Diplomat. It was one of the best improvements I ever did.

Fast forward to my 2014 DS, I added the Koni FSD's to the rear axle and tag. They didn't make a Koni FSD for the IFS front end, so I went with the old Koni Red Adjustable. The Koni Red's were no better than what I pulled off. About a year later, Koni came out with the EVO's for the front. I found they worked well.

When I bought my 2019 DS, I immediately changed the drive axle and tag axle to Koni FSD's and the front to the Koni EVO's. (They only make FSD's for the rear). I found on all three of my DP's that the Koni FSD's in the rear helped with more stable cornering, less lean. I'm very sensitive to ride quality and felt the rear of the coach rode better; some may not see a difference.

The rear and tag axle use the same shock. I also added Centramatic wheel balancers to all three axles while I was doing the shocks.
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Old 08-29-2022, 01:53 PM   #12
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Koni Evoss

HI Mahdi
I just put the self-adjusting Koni Evos on the front for now...
Will probably end up with rears as well, but very happy with the ride difference that the fronts made - you are sitting AHEAD of the front axle so you feel more of what the front tires are doing...
Put them all around on my last coach - '08 Newmar Kountry Star - really improved the stability, but the stiffness I believe contributed to the bang, bang, bang ride on the Calif freeways... Caveat - those were an older generation of Koni's...
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Old 08-29-2022, 10:46 PM   #13
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Thank you Dutch Star Don and Bob for the information. I shall try to get those put on. What facility would be best to install them?
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Old 08-30-2022, 08:53 AM   #14
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The fronts are very easy to install. I laid on the ground and was able to do them by just turning the front wheels to one side and then the other. The rears, however, require that the duals and tag tires be removed. On the Freightliner chassis, they put the shocks on the outside of the frame, near the tire.

With that said, a tire store that handles trucks could probably do the work. I would avoid taking it to someplace like a Freightliner shop and paying their hourly rate.
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