Tried Falken RT660 245/40R17 on Enkei RPF1 17x9 +45.
I have Verus RLCA and temporarily have coilovers from a gen1 car.
~1" drop vs stock, and -2.5º camber at ride height (so ~0.5º additional camber compared to stock arms?).
To check for clearance issues, I put the car on a fork lift, disconnected the rear end links, and fully loosened the spring seats (ideally I should have removed the spring altogether, but I didn't have time to do that).
Then I used a hydraulic jack to raise one of the rear wheels at a time, until the rear jacking points started to rise off the hockey pucks on the arms of the lift.
Remember that this may or may not represent what happens to
your suspension in the real world.
If you only ever drive on mostly flat surfaces, and your spring rates are super high (autox'ers?), then the wheel may never go that deep into the wheel well.
However, if you have softer spring rates and for example you go down The Corkscrew at Laguna Seca, chances are your wheel will go into the wheel well as deep as the suspension geometry allows.
The other factor that you may or may not want to consider is sidewall flex of the loaded outside tire. I don't have enough data to say how much the
top of a laterally loaded rotating tire moves compared to only vertically loaded static tire, or even in which direction.
Anyhow, here are the photos. Use your own judgement to draw conclusions.
1) First test, no adjustments vs gen1 setup.
The rear coilovers were already set up to have ~7 mm less compression travel than recommended by the installation instructions that came with them. Notice that some of the rubber "antennas" turned into J's.
Honestly I don't even remember if I jacked the wheel all the way at that point or stopped early. It's THAT close.
2) Adjusted the coilover to have 18 mm (!!!) less compression travel than recommended.
Now I can squeeze a caliper in between the tire and the fender liner.
Not ideal suspension travel, but now I'm pretty confident they won't make much contact if at all.
(Note: I adjusted the coilovers differently after that for different wheels and tires)
3) Photo of the fitment on the ground. Basically flush, but IMO a bit too aggressive.
Note that RT660's are very wide.
It's possible that other 245/40R17 tires on 17x9 +45 will fit perfectly fine.
Also worth mentioning that I didn't have time toe check
inner clearance, which might also be a concern as we get into the higher numerical offsets.