Wheels from 18 to 19 - pro and con

[Karol3dd]

Hi everyone,

I thinking about upgrade wheels from 18 to 19 on my b9. Ideally would be to get 19 rotors from b8. Can i ask for help with making decision coz i'm bit worried about losing performance over just better look. What else need upgrading in suspension when i change rims from 18 to 19? What are pro and con?

[Stevey Y]

23 hours ago, Karol3dd said:

Hi everyone,

I thinking about upgrade wheels from 18 to 19 on my b9. Ideally would be to get 19 rotors from b8. Can i ask for help with making decision coz i'm bit worried about losing performance over just better look. What else need upgrading in suspension when i change rims from 18 to 19? What are pro and con?

Hi you can use the 19 inch wheels as long as you choose a tyre profile that brings the wheel O/D to the same size as the original 18 inch wheel, pros it looks better, cons low profile tyres suffer more punctures and bigger wheels are heavier.

Steve.

[Magnet]

And the ride is likely to be harsher Karol, due to the lower profile  tyres. 
Kind regards,

Gareth. 

[white_shark]

Hi Karol3dd,

Not sure you've already made your decision or not - but I just purchased a 2019 a4 b9 with 19" wheels (fitted originally since it's an S-Line) and I am thinking about replacing them to 18". IMO the ride is kinda too rough and I also am not a big fan of such low profile. It's 245/35, which is in my opinion way too low. 

Cheers,

[bhuman]

Evening all, I know this is a year old now but if someone can help that would be really appreciated.

I've done far too much reading and can't see the wood for the trees now.  I have a standard stock sport 2016 B9 Avant with stock 17" wheels ET 38/9 I think.   Im looking to upgrade to 18" rotors but for the life of me can't find genuine 18 rotors that come off an A4 /A5.  There seems to be a surplus of either 19"s off A4/A5 or 18" rotors that come off A3/A1.  The latter are 112 but the ET range are in the 50s.  My question is, I thought the ET shouldn't stray more than 5mm from the stock, so would these A3/A1 rotors either not work on an A4, or would they look ridiculous?.  I was also thinking of changing tyres to 225 45 instead of the standard 245 40 profile, just to keep the comfort levels up on the the sport suspension - I  have 50 profiles just now, it's a family car and lots of miles for work mean i need to balance comfort and looks - hence not really keen to go to 19".  Also would prefer not to get replicas -worried about quality safety....

Does anyone have any thoughts or photos of what the A3/A1 18"would be like on a 2016 A4 Avant??  I'm in Scotland so roads are not the greatest for our potholes etc.

Your tube access help is really appreciated!

[bhuman]

Evening all, I know this is a year old now but if someone can help that would be really appreciated.

I've done far too much reading and can't see the wood for the trees now.  I have a standard stock sport 2016 B9 Avant with stock 17" wheels ET 38/9 I think.   Im looking to upgrade to 18" rotors but for the life of me can't find genuine 18 rotors that come off an A4 /A5.  There seems to be a surplus of either 19"s off A4/A5 or 18" rotors that come off A3/A1.  The latter are 112 but the ET range are in the 50s.  My question is, I thought the ET shouldn't stray more than 5mm from the stock, so would these A3/A1 rotors either not work on an A4, or would they look ridiculous?.  I was also thinking of changing tyres to 225 45 instead of the standard 245 40 profile, just to keep the comfort levels up on the the sport suspension - I  have 50 profiles just now, it's a family car and lots of miles for work mean i need to balance comfort and looks - hence not really keen to go to 19".  Also would prefer not to get replicas -worried about quality safety....

Does anyone have any thoughts or photos of what the A3/A1 18"would be like on a 2016 A4 Avant??  I'm in Scotland so roads are not the greatest for our potholes etc.

Your time and help is really appreciated!

[Steve Q]

I think it's A5 that had 18 along with the A7. 

As long as the offset and centre bore is right then you should be ok

https://www.ebay.co.uk/itm/305162335141?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=FezDsNMRSh-&sssrc=4429486&ssuid=IE07kO4STZy&var=&widget_ver=artemis&media=COPY

[Magnet]

But don’t forget, the tyre profile would have to be decreased if the wheel dia. is increased. 
Doing this, will compromise the ride quality. 
Are you considering this because 18 inch wheels will look better? 
If so, it’s worth considering that you can’t see the wheels when you are driving, but you can feel the compromised ride quality! 
There are websites which inform you what profiles will be needed when you change wheel diameters. 
Kind regards,

Gareth. 

[bhuman]

Hi @Steve Q is that a replica?  It doesnt say whether it is genuine or not - but at that price point you would think it was.....

[Steve Q]

20 hours ago, bhuman said:

Hi @Steve Q is that a replica?  It doesnt say whether it is genuine or not - but at that price point you would think it was.....

Not sure to be honest 

[Karol3dd]

On 12/20/2023 at 11:17 PM, bhuman said:

Hi @Steve Q is that a replica?  It doesnt say whether it is genuine or not - but at that price point you would think it was.....

Genuine audi rotors have got special symbols: TUV, VIA, JWL

Just ask for more pictures from back, if it got one of them they're genuine 

[Shytot]

The only other thing to consider is choice - 19's are not as prevalent as 18's so the tyre choice may be more limited (and expensive). I had 19's on a 61 Touareg and they were fine but on a car as has been said, they might compromise the ride. 

[FMOB]

Look at the rating plate with the tyre pressures on (by catch on the drivers side door pillar), this will tell you the wheel/tyre combos that will fit as standard and doesn't knock the speedo out, etc.

If none of these work then go off-piste with calculators and the malarkey.

As for wheels, part numbers, etc - you need to find the parts diagrams online for your car as these will list part numbers for the OEM wheels, obs check with Audi the part number is correct before buying so you get the right wheels.

[bhuman]

Hi All, took my sweet time to get this done as I just couldn't find genuine 18" Rotas with the correct center bore.  So have opted for replicas.  I just purchased these:

https://www.omiwheels.com/products/18-audi-ttrs-style-alloy-wheel-gun-metal?_pos=1&_sid=f48303742&_ss=r

I didn't get them machined as I don't want to deal with the corrosion and have booked in (not paid yet) for All Season Michelin Cross Climate 245 40 R18 to be fitted as it was the only 18" selection when booking.

This was before I remembered there was a rating plate (sorry @FMOB)that says 225 45 on winter tyres (Now I understand the OEM for 18" is 245 40).

Does anyone know whether I should change them to 225 45 - considering narrow tyres are better in snow, and these have less difference on the speedo and overall diameter and probably fewer issues with width than the 245 40 as the new rim is now 8in with ET 45 rather than the 7/7.5in ET 39  I have just now.

Any advice is really welcome - I live in central belt Scotland where snow can be intermittent and sporadic - you might get it, you might not - though allegedly it is due next week!!

ive attached the rating plate 

[Magnet]

Hello S ( could you let us know what your name is please - it’s far more personal to be able to address you). 
Anyway, first point- it appears that both 18 inch are XL rated, and these will obviously adversely affect the ride quality. I can see a number of 17 weren’t.

I’m not sure where the narrow tyre/ better snow grip comes from. I must admit that theory is new to me, and can only run that to a limit of considering the grip on your bike tyre on ice, compared with the car tyre !? 
The choice of 225 or 245 and their associated profiles may be strongly influenced by price, which will be affected by popularity. 

Kind regards,

Gareth. 

[bhuman]

Hi @Magnet Many thanks and I believe it's exactly as you mentioned -narrow tyres cuts thru snow better, but I've since read other people's comments saying the wider wheel didn't have too adverse an effect in winterish weather.

I've left it too late anyway - this is what happens when you ponder for too long and then just go for it.  It's all being delivered & fitted on Thurs,  I'm sure it'll all be alright on the night as they say. 🙂