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I've got some 16" rims on my '89 S4 and am having a hard time finding the correct tires. Toyo makes them but Tire Rack says they're not currently available.
On my last S4 I ended up compromising and ended up with a huge tractor tire on the rear which always bothered me.
IMHO I don't like it. PO on my car bought S4 rear wheels, put the smaller tires on it ("because he couldn't find a matching set"). I don't like how it looks. The tire sits behind the rim, so it's very obvious that the tire is too small.
Thankfully the owner gave me the original rears which I'm going to put back on.
A couple of weeks ago I ordered Toyos in the correct size from Tire Rack for my '88. Then they called me to say they could not get them for an indeterminate time, so they cancelled my order. They also could not get the Bridgestone RE11 that I got from them a couple of years ago for my '90 either. Several other suppliers listed the Bridgestone, but then could not supply.
In the end I went with 245/50 vs the 245/45 specified. Much more choice and a barely visible difference IMO. The circumference is only +3.3%.
I run this on a set of S4 wheels. They look good. Only you will know there could be a larger tire. It's just 20mm, after all.
Check the detailed specs for the tires and you'll see the wheel sizes the mfg suggests.When I look, 7" is on the smaller end for a 225/50/16 tire. Tire Rack is good for that.
1. Call on the Toyo's, I'm sure the lack of inventory is temporary
2. Ask about the RE-11's, might be coming back
3. Look into the Porsche classic tires (that is what I would do)
4. Buy different wheels (actually that is what I did)
A lot of options before reducing to 225's out back on an S4, something I would never do.
I've got 255's on the back of my 80 mounted on modified phone dials.
EDIT - I totally forgot what the issue is with the Bridgestone RE-11. The fronts are V rated while the rears are W so when you do a search under the car they don't pop up. This is baffling why there is a difference and I cannot imagine there would be any issues running them.
I'm looking forward to the pricing on those Dealer-supplied, special-order tires.
I get the heretical "reduced" (lol) tires from the local tire stores (more heresy!) and save money by getting them to price-match and cut installation costs. I like these: Continental ControlContact Sport AS
Tire rack tires I believe generally have fairly new date codes of manufacture. If you are buying new tires from a local source I'd ask about or check the date code of manufacture just to make sure that you are not buying (old) new tires.
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