S3 wide tires 18x8.5 and 18x9.5

scott_159

Registered User
hi guys

i have a set of these BBS ch reps, im looking to fit the widest tires possible to fit to these wheels 18x8.5 front and 18x9.5 rear.

whats everyones thoughts on this? what are you running? any pictures of your set up?

im going to be looking to keep with the standard suspension (no coilover) set up, looking to install new shocks and -30mm springs. so will need to bear in mind clearance

cheers guys
 

superkarl

MAN OF STEEL
8.5 will require a 235mm tyre whilst the 9.5 rim will require a 255.

Unsure what profile, there is calculators online that let you compare profile sizes to match the circumference of the OEM wheels/tyres so your speedo is still correct and it doesn't look stupid
 

scott_159

Registered User
cheers i am half thinking 235/40/18 and 255 or 265/40/18 although a 35 may be needed just trying to find some info on what others have used.

cheers!
 

Jenno007

Registered User
make sure the rolling radius is very close between the front and rear axle, your haldex will thank you for it
 

superkarl

MAN OF STEEL
make sure the rolling radius is very close between the front and rear axle, your haldex will thank you for it
The haldex is a viscous coupling it will take care of itself. That's its job
 

Sam_

Down under
265 will be a breeze on the rear and 235 should be fine on the front. I run 255 with an "aggressive" offset up front and it does catch occasionally even with mega stiff suspension and 3 degrees of camber.
 

scott_159

Registered User
cheers sam, im thinking along the lines of 265 rear now and 245 front?

maybe keep to the same format of ***/40/18? any pictures of your setup?

cheers
 

Sam_

Down under
You'll want lower profile than that I'd say? You will also want to make sure the rolling radius aren't too different front vs rear. There's loads of calculators on the net.

Don't have any pics of it on 255/40/17s but this was the most recent on the 245/40/17:

 

Alex C

Well-Known Member
VCDS Map User
The haldex is a viscous coupling it will take care of itself. That's its job

It's a hydraulically operated wet clutch pack isn't it? the torque is transferred through the friction between the friction disks rather than through a viscous fluid

@Sam_ whats the width of your rims? is that a 245tyre on an 8.5J rim?
 

superkarl

MAN OF STEEL
It's a hydraulically operated wet clutch pack isn't it? the torque is transferred through the friction between the friction disks rather than through a viscous fluid

@Sam_ whats the width of your rims? is that a 245tyre on an 8.5J rim?
I'm not sure what it would class as, a viscous coupling has plates in it. But yeh perhaps the haldex fluid only plays a role of hydraulically operating the plates.
Dunno if you've seen inside a dsg box but it's basically the same as one of those clutches.
To think our crappy haldex Might have played a part in the development of dsg
 

jojo

Looking for Boost!
Staff member
Moderator
I'm running 225s on a 9.5" rim! lol :D
 

Lulinfornoah

Audi s3 8l apy '99
You'll want lower profile than that I'd say? You will also want to make sure the rolling radius aren't too different front vs rear. There's loads of calculators on the net.

Don't have any pics of it on 255/40/17s but this was the most recent on the 245/40/17:

Hi mate! Sorry for old threat but what is the wheel offset? have you got spacers? Thanks!
 

Sam_

Down under
Hey, the "final" offset is ET15 front, ET20 rear. I do use spacers but you can get the pro race in a range of offsets so I'm sure you can get something that works. I only have to run such high offset on the front to clear the 18Z 6 pot Brembos. If you're running smaller brakes then I'm sure you could run 20 or 25 all round.
 

Lulinfornoah

Audi s3 8l apy '99
Thanks dude! I appreciate your answer :) I will choose et15 all around for looks, btw i’m finding a set of BoxsterS/996 Front calipers to match with some 330 brera discs, so not the bigger brakes as you. If I choose 18x9 instead of 17x9 wich tires do you recommend me?
 

Plake

New Member
They're 17x9". 245s sat better than the 255s I reckon.
I know, zombie thread but just joined the s3 club and desire more tire and less rim. Really digging this set up. No issues with the 17’s clearing the stock brakes? Thanks if ur still out there. Lol
 

jojo

Looking for Boost!
Staff member
Moderator
I know, zombie thread but just joined the s3 club and desire more tire and less rim. Really digging this set up. No issues with the 17’s clearing the stock brakes? Thanks if ur still out there. Lol
If we are on about stock 312mm brakes, 16s will clear the calipers, it’s the offset and wheel spoke clearance you need to be concerned about, the S3 doesn’t really do dished alloys with the spokes further inwards.
 
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