Audi A6 Avant 2008 new tyres - can I increase profile

Audi A6 Avant 2008 new tyres - can I increase profile

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Mattjevans

Original Poster:

234 posts

93 months

Sunday 12th March 2017
quotequote all
So I've got a 2008 Audi A6 2.7 Avant "Le Mans" (no idea how they came up with that name, personally the closest the car's been to Le Mans is Dartford).

It's a station car mostly now doing 3 miles a day (plus weekend taxi taking kids to their horses) that's done 90k now (my wife originally had it as her daily, she put 50k+ miles on it over 3 years) and I'm planning to drive until it dies. It needs a bit done this year that I've neglected over the last 18 months.

Among this I need new tyres (might be just fronts but I suspect all around). Car currently has 19/255/35 (crappy cheap brand but I'm going back to Pirelli's this time). Pretty sure this is the standard as it is the sizing on the sticker chart inside the fuel hatch. Fair to say its a fairly firm ride - nice on the motorway but not so great on country lanes around here.

Is it possible to put a higher profile (e.g. 19/255/40 or 45) on and would that improve (soften) the ride quality or is it just going to f**k things up all round (wheel arches, suspension, speedo etc).

Obviously I won't mix and match front and rear so would only do this all round.

Thoughts appreciated.


DuraAce

4,240 posts

161 months

Sunday 12th March 2017
quotequote all
Sell the 19s and buy some 17s?

Just changing profile will mess your speedo reading. Insurance implications of fitting non standard (type approved?) sizes?

Loads of wheels on ebay, you should end up in profit as 19s should be when more and future tyres will be cheaper as well.

AndrewEH1

4,917 posts

154 months

Sunday 12th March 2017
quotequote all
DuraAce said:
Sell the 19s and buy some 17s?

Just changing profile will mess your speedo reading. Insurance implications of fitting non standard (type approved?) sizes?

Loads of wheels on ebay, you should end up in profit as 19s should be when more and future tyres will be cheaper as well.
I did this with my A4 Avant, you could notice a slight improvement in the ride plus the tyres are a hell of a lot cheaper!

Mattjevans

Original Poster:

234 posts

93 months

Sunday 12th March 2017
quotequote all
I doubt 17's will clear the front discs/calipers but 18's should be fine. Will do some hunting.

I guess I'll need 255/45's on 18 inch wheels.

catso

14,794 posts

268 months

Sunday 12th March 2017
quotequote all
Mattjevans said:
I doubt 17's will clear the front discs/calipers
Assuming the A6 discs are no bigger than 345mm as per the S4 then they should? - I had an A3 3.2 with 17" wheels (225/45 x 17) and the same size 345mm discs as my S4 with 19" wheels.

There wasn't much clearance (wouldn't have fit 16") and I'm not certain the calipers are the same but the discs fit in the wheel.

Dr G

15,198 posts

243 months

Monday 13th March 2017
quotequote all
17s are fine on that; lots of people run them for winter tyres.

Kell

1,708 posts

209 months

Monday 13th March 2017
quotequote all
Funnily enough, I've just this weekend gone back to my 19" Le Mans wheels from running 17" ones with winter tyres all winter.

I bought the wheels (and tyres) second hand, but managed to get the details out of the guy that sold them.

They're 17x7.5J ET45.

This differs from the Audi recommended spec of 17x7J ET42 for winter wheels. I believe they recommend narrower wheels to stop snow building up. Clearly, this is not going to be an issue for you.

Tyres are 225/50/17 and they're a hell of a lot cheaper in that size than in 255/35/19.

The first thing I notice every year when I do this is how much more crashy the ride is when going beack the the summer wheels.

The other thing is the weight. I've never put them on the scales, but the Le Mans wheels are VERY heavy. Reducing rotational mass is always a good thing.

PS - the car is a Le Mans as they built them to celebrate the R10 diesel winning at Le Mans. I've seen several adverts advertising petrol Le Mans, but AFAIK they were only diesel versions.

Mattjevans

Original Poster:

234 posts

93 months

Monday 13th March 2017
quotequote all
Kell said:
Funnily enough, I've just this weekend gone back to my 19" Le Mans wheels from running 17" ones with winter tyres all winter.

I bought the wheels (and tyres) second hand, but managed to get the details out of the guy that sold them.

They're 17x7.5J ET45.

This differs from the Audi recommended spec of 17x7J ET42 for winter wheels. I believe they recommend narrower wheels to stop snow building up. Clearly, this is not going to be an issue for you.

Tyres are 225/50/17 and they're a hell of a lot cheaper in that size than in 255/35/19.

The first thing I notice every year when I do this is how much more crashy the ride is when going beack the the summer wheels.

The other thing is the weight. I've never put them on the scales, but the Le Mans wheels are VERY heavy. Reducing rotational mass is always a good thing.

PS - the car is a Le Mans as they built them to celebrate the R10 diesel winning at Le Mans. I've seen several adverts advertising petrol Le Mans, but AFAIK they were only diesel versions.
Thanks - very helpful

Kell

1,708 posts

209 months

Tuesday 14th March 2017
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Just to prove it...

Summer



Winter



Mattjevans

Original Poster:

234 posts

93 months

Wednesday 29th March 2017
quotequote all
Am I correct that these will fit fine?

https://www.ebay.co.uk/itm/122304484758

AudiSport

1,458 posts

217 months

Wednesday 29th March 2017
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I have a set of five 18" RS6 style genuine Audi alloys if your interested in buying them from me? They are as per the winter alloys pictured above, and came fitted to my C6 A6 Avant. They could do with a Referb to look their best, but all tyres are good. In fact, the front Avon ZZ5s only have 1k miles on them.

Mattjevans

Original Poster:

234 posts

93 months

Wednesday 29th March 2017
quotequote all
Thanks but if I change I'd do 17's, I can't see an extra half inch in radius/profile being much of a difference

AudiSport

1,458 posts

217 months

Wednesday 29th March 2017
quotequote all
Going from 18" to 19" myself, I can confirm it does make a big difference. However, you know where they are if you change your mind ; )

Mattjevans

Original Poster:

234 posts

93 months

Thursday 30th March 2017
quotequote all
Thanks. Will drop you a note if I do.

Kell

1,708 posts

209 months

Friday 31st March 2017
quotequote all
Mattjevans said:
Am I correct that these will fit fine?

https://www.ebay.co.uk/itm/122304484758
I would say so, but your best bet is to get in touch with the seller.

anotherswifty

277 posts

88 months

Monday 21st August 2017
quotequote all
HJ confirms 17s will fit over the calipers
https://www.honestjohn.co.uk/askhj/answer/8658/can...

annodomini2

6,868 posts

252 months

Tuesday 22nd August 2017
quotequote all
A6 2.7 Tdi should be 315mm on the front brakes