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I am using a bolt-on spacer which bolts to the old hub and has a new set of studs. Alternatively, you could use a slip-on spacer but press-in extended lugs through the actual hub. I believe an "adapter" is typically a type of spacer that also changes the bolt pattern so you can use wheels...

Back from my mechanic's shop. Here are my initial impressions. Again, I am running: 19x10+54 275/35/19 front 19x10+54 285/35/19 rear The wheel offset is +79 (C6 base wheel) but I have 25 mm spacers which lower the offset to +54. The first issue we had was the stock wheel lugs are pretty...

Oh, it's going to be tight for sure. There's only about 11" of room between the inner liner and the outer fender. My 285 tires are 11.4" section width. I might need to upgrade the springs to something firmer to reduce the chance of rubbing. I will also consider trimming away the inner liner...

I will be running 285/35/19 which is 682.1mm diameter. Stock size of 255/40/19 is 686.6mm. That is a difference of only 4.5mm or 0.66% speedo error. Ride height will only drop by 2.25mm and arch gap will increase by 2.25mm. The main thing I am worried about is clearance on the inner wheel...

Correct. The larger wheels did not improve the skidpad performance of the car. Although, going to a larger diameter wheel never improves any vehicle performance - there's a reason why race cars typically run smaller diameter wheels than street cars. I don't think D3 ever did suspension work...

I remembered the old Motor Trend article about D3's XLR-V, and they ran a 285/30/20. No idea on wheel specs, but they got it to fit. Looks pretty tight whatever it is. Tuners: 2008 D3 Cadillac XLR-V - MotorTrend

I hope to find out this week. Still waiting on wheel #4 to come in. I'm running 25mm spacers F & R, but I'll move up to 30/35mm or wider in the rear if I need more inside clearance. I am not worried about the fender side - I can roll/pull those out as needed. Also, my car currently has...

I am about to put 19x10 +79 on all four corners. I will be using 25mm spacers as well, so the effective offsets will be +54. Tires will be 275/35/19 (f) and 285/35/19 (r). Based on my mock-ups, these should be OK to run, but final fitment will be the final say on that.

Thank you! The weather here in TX is already pretty nice. Top down most any time! :)

Yes, don't do much driving on tires that that old! Might be ok for some light cruising, but push them too hard or hit a pothole and you might be in for a tow!

Welcome and enjoy the drive!

Ah OK. I am going to put 19x10 on all four corners and run 275/35 and 285/35. I am considering swapping over the Z06 factory springs and sway bars. Not going to race it, just back road driving.

I would perform a "top reset" procedure first. I don't recall the exact steps, but you should be able to search the forums for it. Something about holding both window switches down and up for 5 seconds each plus something else?

Ah, OK. Yes, being more front biased in stiffness is one way to combat oversteer. I noticed that you run 265 square tires - have you ever considered running something like 265/285 to also help with rear traction? Do you find the rear coming loose when going into turns (I'll assume off...

Any reason why you didn't run ZR1 suspension all around? Did you specifically want to firm the front more than the rear for AutoX or something? Also, did the oem shocks have any issue with the stiffer springs?

I agree! :)

I think the most rare color out of all is the Elektra Blue ('08-'09). It's a very striking color and makes the XLR look the most exotic to me.

If you do, hit me up! Always down to grab a drink.

Oh, this is getting good. Let me know how that goes.

Thanks, everyone! I am excited to be a part of the XLR owner's club! Here's a quick photo I took while fueling up on the road trip home.