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The Tire Rack's Tire & Wheel Forum
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Old 11-12-2007, 11:36 AM   #1
Wide Tires
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Join Date: Oct 2006
Location: Calgary AB
Posts: 106
My Ride: 2005 BMW M3 Coupe
To Garry: Acceptable tire run-out

Greetings,

Last summer I replaced the OEM Continental tires on my new BMW with a set of BF Goodrich g-Force T/A KDW tires. The BF Goodrich tires are sizes 225/40R18 & 255/35R18 mounted on TSW wheels sized 18x8.5 & 18x9.5 respectively. The OEM Continental tires are size 205/55R16.

Since the BF Goodrich tires were new there has always been an annoying oscillating sound/feel coming from the BF Goodrich tires. The OEM Continental tires do not oscillate at all. I have had the BF Goodrich tires back to the shop for re-balancing but the oscillation persists. They have NOT been balanced on a Hunter Road Force balancer.

Yesterday I jacked up each corner of the car one at a time and spun each tire/wheel by hand while visually watching for runout. It was clear to see that each of the 4 BF Goodrich tires had a low spot. Next I used a machinists dial indicator to measure radial runout of each of the 4 BF Goodrich tires. I also measured runout of each of the BMW OEM Continental tires. The BF Goodrich tires all have a flat spot which measures 0.070"~0.080" low. The OEM Continental tires all had runout of between 0.010" ~ 0.020".

What is the acceptable limit for radial runout for automobile tires? Do all manufactures adhere to the same standards? What can be done to rectify this problem?

Sincerely,
Matt France
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Old 12-04-2007, 05:33 PM   #2
My,My,NiceCI
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Join Date: Nov 2007
Location: Ft Lauderdale, Fl
Posts: 12
My Ride: 02 330CI
Matt, I worked in the tire business for about 4 years at 2 different Sears (back when they were actually good). In my time spent there I could almost count on one hand the number of tires that were out of round. The odds of you getting four bad tires on the same car are astronomical. That being said, if you can visibly see/feel flat spots on the tires then you need to have those replaced ASAP. I dont know the specifics on where you bought them but that shop needs to replace them/refund your money. Regardless of what they tell you, this will cost them nothing but their time. They need to get in contact with BF Goodrich and explain the situation. BFG will ask them to inspect the tires, if the shop agrees with you and forwards that info to BFG, BFG will in turn replace the tires.

Also, reading other posts on this website has lead me to believe that you should push for a refund as a opposed to replacement. Looking at that treadpattern I can tell you right away you're going to expierience noise no matter how perfectly balanced or well made they are.

If you're still interested in BFG I had the BFG G-force sport on my last car and liked them. I was searching this board looking for info on them to see how ppl liked them on the bimmer. Obviously they wont live up to the michelins I have on there now, but at literally half the price ($158) I can probably live with it.

Just FYI, many ppl believe BFG is made by michelin. Not true, they are owned by michelin. Big difference! Crysler was owned by Mercedes to give a good analogy.

Sorry to hear about your problem, good luck and let us know how it goes or if you have any more questions.
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