xTxTx

Hello all

Would these wheels fit my TT 2008

http://http://www.oemconcept.com/pro...roducts_id/456

19x9.5/5x112/66.6/ET48

considering ill be getting the RS6 brakes 390mm 8piston at the front in a few weeks

thanks for any input

Slyman

Your link doesn't work

xTxTx

http://www.oemconcept.com/product_in...roducts_id/456

Vertini Monaco Concave 19"

http://www.oemconcept.com/index.php/cPath/93

Beaven X5

These are the tools I use to figure out the OEM size and convert them:

I use Momo.it site for OEM sizes: Technical Wheels Guide

Our original wheels are either 8X17 or 8X18 (size of 8" wide by 18" diameter) ET47 (offset of 47mm) 5X112 (bolt pattern of 5 holes by 112mm spacing)

Then I use 1010tires.com wheel offset calculator: Wheel Offset Calculator

Using the tool, for the 19X9.5 ET48 wheels your offset is too much and you will have 20mm less inner clearance than OEM. So these wheels will probably not work because of the offset. They will probably rub against the interior of the wheel well or against the suspension.
As for the 19X8.5 ET35 they should be OK and ever come out a litter more than OEM. I read somewhere that adding a 20mm spacer will make our OEM wheels fit perfectly with the outside of the wheel well.

As for the center bore: It looks like our Audi TT have a 57.1mm center hub bore: so your wheels having 66.6 will work but you will have to add a hubcentric ring (57.1 inner / 66.6 outer). If you don't add these hubcentric rings, you will have vibrations as the wheels will be holding by the lugs only instead of resting on the center bore and be maintained in place by the lugs. Last time I got some hubcentric rims, they were not very expensive ($4-$5 dollars each). I use plastic rings on my Volvo winter wheels as they are easier to remove than metal ones after sitting in salt all winter.

Another tool I sometime use is the tire sizing tool from miata.net:Tire Size Calculator

More information than you need but I think these tool should help everyone find the right wheels and tires for their car

Here is another great resource on wheels measurement: Wheel technical information

robbie_boy

Wow Great write up +1 Beaven X5

xTxTx I see you creep on this site sometimes as well and not just our TT site

Rob

xTxTx

Great info Jean Claude.
but how come ET35 is a better fitment than ET48
TT offset is ET52

xTxTx

Wheels ordered , Hub centric ring ordered

Beaven X5

The offset is the distance between where the wheel sits and the center of the wheel. If you increase the width of the wheel, you need to reduce the offset because you don't want the interior of the wheel (tire) to rub against the suspension arms or the interior of the wheel well.

Every time you increase the width of the rim/tire but 1/2 inch, you decrease the inner clearance by 1/4 inch unless you change the offset.

Less offset = more inner clearance.

Look at this picture taken from the last link of my previous post "wheel technical information"

robbie_boy

JeanClaude
So if I run a 18x8 on my TT with a 32 offset how will this fit?

Thanks,
Rob

Beaven X5

Long answer:
The OEM standard wheels are 18X8 ET47 offset.
Your 18X8 ET32 will give you 15mm more inner clearance (no problem there) and will extend outside 15mm more than OEM. Just look on your car and confirm if your fender has 15mm (5/8") extra clearance between the tire and the lip of the fender.

I have read in a forum somewhere that someone tried many spacers and ended up choosing 15mm spacers for his TT and was very please with the result. This 32 offset will produce the same effect as putting a 15mm spacer. I had put a note for myself that if I was to ever install spacers, 15m was the perfect size.

Short answer:
Yes it will fit and probably look ever better than OEM.