magik235
Central Wisconsin
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Joined: 11/22/2011
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I have 6 new bias tires. When I start out the RV severely shakes for 5 - 10 miles until they smooth out. I have heard the phrase bias tires start out square and you have to drive them round. I have 4000+ miles on them now and they still do it. Is this common? Any suggestions for improvement?
1985 Sport Coach http://www.rv.net/forum/index.cfm/fuseac........d/tid/26101292/srt/pa/pging/1/page/1.cfm
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BIG ALEX
ALBUQUERQUE,NM
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Joined: 10/25/2011
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Change to radials better tire and runs cooler.
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2oldman
Winchester WA
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Joined: 04/15/2001
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Why would you have bias tires in the first place?
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raygreg
Seattle,WA
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Joined: 06/30/2003
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I didn't know that they still made bias tires?
Learn something new every day.
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tatest
Oklahoma Green Country
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Joined: 05/14/2005
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The tires are not round, or out of balance, or you have both problems. It is not something that improves with age. You might be thinking of flat-spotting, that is not what is happening.
When all tires except Michelin X and Pirelli's Cinturato were bias ply, and nylon was introduced as a replacement for cotton tire cord, there was problem with unbelted nylon tires flat-spotting while parked for a long period of time, but that was something that went away in 2-5 minutes of driving.
Changing to polyester for tire cord, and putting circumferential belts on tires (glass, aramid, steel belts) made the flat-spotting problem disappear.
Unbelted bias-ply tires are still available, and you should be able to find examples that are truly round. They are used in racing, implement and other off-road applications, as well as smaller size trailer tires. It sounds like you've gotten your hands on some really low quality trailer tires. Good bias tires are hard to find.
Tom Test
Itasca Spirit 29B
2001 Ranger Edge
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mobilefleet
on the road
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Joined: 10/09/2005
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I have run bias on my travel trailer and they are superior to radial any day for trailer applications. Yes they ride more harsh than radials, but they don't flex near as much and can take potholes and sidewall abuse way better than radials any day. Bad part is they wear funny and get flat spots, but I've had mine since 2005 on the trailer. The radials they put on them these days would be lucky to go 2-3 years. But- I'd not have bias on a class C rv that you actually ride and drive in. Too rough of a ride.
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camr
Winnipeg
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Joined: 07/24/2010
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The 70's called. They want their tires back!!!! 
Cam, Heather and Abby Aussie (Austalian Shepherd)
F-250 PSD
Open Range 345RLS
Reese 5th Airborne pinbox
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W4MBG
Williamsburg, VA
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Joined: 12/15/2010
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we used to have big bias ply mudders on the pickup truck. very rough for the first 2 or 3 miles. my kid started calling it "the bumpy truck" when he was 4. he is now 22, and still calls it that. but now that it has radials on it it's smooth as glass.
1999 Winnebago Minnie, 29', Triton V10, mostly stock. So far...
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hilldude
Red house WV
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Joined: 03/08/2008
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The old nylon bias tires always did that, they dont get better they will always be flat untill run a few miles.
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PaulJ2
Northwest Oregon
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Joined: 12/23/2005
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My Cherokee has BFG A/T tires purchased a year ago. Noticed the "square wheel" thing for a mile when cold but smooths out after a bit. Looked at the data on the sidewall----Tread plies-3 polyester,+2 steel,+2 nylon. Total of seven and I didn't know they still used nylon. Sidewalls 3 ply polyester. That explains it I guess.
I remember the old bias plies doing the same thing when cold.
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