x98boardwell

Just purchased a pair of RUF 18's. I am wondering what spacers I will need for these wheels and what are the best tires to run on them. I would like the widest available (fitting on the wheel correctly of course) for 18" wheels. I had 19's on thew car so I will need to purchase new.

Questions:
- What are the proper spacers used for TT's. I know these rims were only made with one offset and could be used on both narrow and wide bodies so trying to ensure I get the proper offsets for my application.
- What tires are the best bet for these wheels (18x10 and 18x8.. I believe) and what are your thoughts?
- The wheels came with spacers from the PO but I'm unsure what I will need since he was a narrow bodied car.

Thanks for the help. Please let me know if there is anything else that I may have missed as well.

Bryan

x98boardwell

Also... Car has been lowered significantly with Stromski Monoballs and coilovers so it is not stock ride height. I would say it is slightly lower than european ride height.

ca993twin

You will need an approx 1" thick spacer to get the proper look with a Ruf wheel. On a 10" wide wheel, you should be looking at a 285x30 or 295x30 tire. If your TT still has AWD, then you must closely match the rolling diameters of the the front and rear tires. Tire Rack has all the data you will need, and they have sales guys that know our cars and can make good recommendations. The Ruf wheels that you now have are the same widths as the wheels that came as stock on our TTs. The stock tires were: 225x40x18 and 285x30x18.

Knight

Your pretty limited with an 8" front, I'm going to lean towards a 225 too.

For 10" rear, 295 is probably pushing it, factory size of 285 makes more sense. Keep in mind the width of many tires vary between manufacturers, example a Sumi 285 is much narrower vs a Michelin. Damon @ Tire Rack is a great help for this info.

The spacer size is going to be more tricky, especially with your car lowered and your visual preference. It's going to be a decent size in the 28mm range most likely.

AC/911's

Find ET's on backs, get to around 45 front & 35 rear, 245/35 & 295/ 30/18's are good (24.8'' & 25'') rear's wear quicker.

dombeau

Right, just fitted sumi 285-30r18 on the rear and it looks stretched a bit... 295 next time...

OverBoosted28

The 245's will not really seat well on the 8" rim. You want the sidewall pretty close to straight so you'll keep the stiffness.

Most 295/30-18 & 225/40-18 pairings result in an approx. 25" OD on each tire. I have been using that combo for years with good results. Would like to go wider in the front but having a hard time finding something wider in the front and still keeping close to rear OD. I think 235/35 is the closest and can't find an acceptable brand that I could use that also makes the 295/30. It seems like it's either or but not both.
I wish my fronts were at least 8.5" or 9"

x98boardwell

I've always used rotations per mile to determine closeness from front to back. Let's say one is 770 turns per mile and the other is 810.. The difference is a % that I would try and keep as low as possible. Anything above 4% and I would start to be a little concerned of long term issues.. make sense?

Does anyone else use this approach?

AC/911's

Never noticed any difference on 8'', but am running 8.5'' now

Knight

Yes I use the same method.