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Audi a6 c6 quattro tire compatibility

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Old 04-11-2017, 02:25 AM
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Hello. Last week i bought some 19"inch wheels for my car.The wheels are 8.5j on front with 235 35 19 and 9.5j with 255 35 19 on the back. Is it ok for the car? I m a little outdated on the subject but somebody told me it is not good for the car differential to have different width. Thanks
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Old 04-11-2017, 02:58 AM
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Do you know what model year the car is?
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Old 04-11-2017, 03:03 AM
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2005
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Old 04-11-2017, 03:10 AM
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Audi doesn't list 19" wheels in my manual, just 16" - 18". The aftermarket suppliers show 245/35ZR19 (93Y) with XL rating for 19" size. The size you selected for the front may be too small.
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Old 04-11-2017, 03:18 AM
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Thats how i bought them . So the thing with the differential is it true? Can it be damaged for using these tyres?
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Old 04-11-2017, 03:25 AM
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Yeah, that could be an issue with the 4WD system, assuming you have that. I was thinking more along the lines of inadequate load capacity on the front end with those tires but I don't know what engine you have.


I think about damaging tires on bad roads with an under-size tire side wall. Maybe your roads are perfect? These cars are very heavy with close to 70% of the vehicle's weight on the front tires.
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Old 04-11-2017, 04:12 AM
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I have the 3.0 diesel engine all wheel drive.i live in romania so the roads are horrible but i was thinking that if i buy wider tyres it wouldnt be good for the car articulation.my only concern is about the diferrential because that person told me that a 255 35 tyre is bigger the 235 35 tyre and the front wheels will have more rotations then the back ones causing diferential damage
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Old 04-11-2017, 04:19 AM
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Originally Posted by Barcanescu Constantin View Post


my only concern is about the diferrential because that person told me that a 255 35 tyre is bigger the 235 35 tyre and the front wheels will have more rotations then the back ones causing diferential damage


I agree. We see these warning:


Originally Posted by Tire Rack


The ability of a four-wheel drive and all-wheel drive vehicles to divide the engine's horsepower between its four tires is especially useful on loose or slippery surfaces such as sand and dirt, as well as on wet, icy or snow-covered roads. However, it's important to remember that in order to transfer this extra power, the four-wheel drive and all-wheel drive vehicle's driveline mechanically connects the tires so they work in unison.



Four-wheel drive and all-wheel drive vehicles are equipped with additional differentials and/or viscous couplings that are designed to allow momentary differences in wheel speeds when the vehicle turns a corner or temporarily spins a tire. However, if the differentials or viscous couplings are forced to operate 100% of the time because of mismatched tires, they will experience excessive heat and unwarranted wear until they fail.


Were the previous set of tires all the same size?
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Old 04-11-2017, 04:24 AM
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Yes
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Old 04-11-2017, 05:15 AM
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But why the 255 tyre is bigger? I though it is just wider and has the same circumference. I mean has the same other specifications 35 and 19" .isn t just only wider on the back?
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