My A6 was supplied with 15" wheels.
The wheels are in poor condition so they need to be refurbished or replaced.
Can I replace them with 17" alloys ?
Are there any issues with this ?
Speedo calibration ?
Would they fit in the wheel arches, I am sure I have seen A6s with 17"
wheels, but are there other mods required ?
I have no experience of this and would appreciate if anyone can advise.
Harsher ride. Higher likelihood of bending a rim on a pothole. More
expensive tires. That's all I can think of.
Not needed if you select the correct size tire (see link below).
Better/quicker steering response with 17s, although that depends on the type
of tire as well.
Generally more grip and better high speed stability assuming you'll choose a
wider tire to go with those new larger rims.
Assuming you choose a 17-inch rim with the correct offset and wheel-bolt
pattern (5x112) and the correct tire size, there will be no other mods
required. However, if you have stock suspension (not lowered), putting on
larger rims will make the wheel gap look pretty bad. The gap physically
won't get bigger, but it's just an optical illusion caused by more rim and
Some aftermarket rims will also require centering rings because of different
center bore, and new lugbolts. Most reputable rim shops will provide these
free of charge when you buy rims from them.
Use this tool to help you select the correct tire size (based on your
current size) in order to keep the speedometer error down to a minimum:
and I thought the speed of a car was taken from a drive shaft within the
gear box.........by an electronic sensor. This way tyre size does not come
into the equation......or does it.
Bigger wheels with bigger tyres will always cause speedo problems with
current technology, the speed is determined by revoloutions of the wheel, be
it via the drive shaft or whatever, bigger wheels and incorrect tyre choice
will always effect the amount of revolutions the wheel does, and cause the
speedo to show a slower speed.
Unless you have a GPS speedo.
What pete said is spot on, you have to lower the sidewall to compansate for
the larger diameter wheel, right down the 35 profile tires for 19", the only
limiting factor on choosing rims is the "J", this is the diameter width
wise, 8J should go on with no problems.
For example, a 1998 A6 Quattro speedometer expects close to 830 tire
revolutions per mile, if it is to be accuarate. Check tire sizes at
www.tirerack.com to see what this spec is for tires of different size.
You can calculate the speedo error based on the ratio of your chosen tire
size to 830. Close enough, anyway.
You will probably need to advise your insurance company, if this is not an
Audi spec option - or risk voiding your policy.
A company refused to insure me for not standard alloy wheels (even of the
same Audi spec, and supplied by an Audi dealer). Note "refused" - not giving
me the option to pay a higher premium.
BTW Stuart, 17's are a bit small, 18" will look much nicer, a nice set of
18" RS4 replicas look very nice on A6's
Tyres are a little more, around 100 quid each for cheap ones, 17" tyres are
abit cheaper, if its a quattro you should see 30k miles from a set of tyres,
if you dont drive like a nutter
30k on a set of (performance) tyres?! My best would be about 20k on Toyo
Proxes for my S3. The worst was 6k for a set of front tyres for my Lancia
4x4 (uprated to 250 bhp). :(
That's a valid point which I forgot to mention. In the US, ins. companies
aren't as strict as in Europe.
Also, the US-spec. '98 A6 did not come with 17" rims, not even as an option.
This option (17x8 rims with 255/40/17 tires) only became available in 2000
for the A6 4.2Q. Not sure how it was in the UK.
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