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Purchased a set of GT4 RS wheels during the Black Friday sale. They arrived very quick about a week later after ordering going from California to Wisconsin. I went with twenties and brushed clear. For fun I just weighed them.
Apex lists the wheels at ~19.9 lbs and ~21.8 lbs. I did not have TPMS sensors or anything else on the wheels.
I have read but not validated myself that stock ALUMINUM WHEELS weigh 20.46 lbs (fronts) and 23.70 lbs (rears). So you gain half an inch in the front, same size in the rear, and save around 3lbs.
This was a new to me scale, pretty cheap from Amazon, maybe 20 bucks. I did check it against a 15 lb hand weight and it read exactly 15.00lbs. Definitely much more accurate than my previous weight measurement process of stepping on a scale then stepping on the scale while holding the wheel! I also tared with the rubberized USB cable which I had used to tie around the wheels....for science!
Will do but it probably won't be for several months. I typically order my tires from tire rack but given the cold temperatures in Wisconsin I will probably avoid doing this until the lows are above 40. I could be completely wrong but I'm not a big fan of tires sitting in 10 to 20° temperatures either on my front porch or in the back of a UPS truck. Or having the tire shop mount the tires in similar cold weather
Will do but it probably won't be for several months. I typically order my tires from tire rack but given the cold temperatures in Wisconsin I will probably avoid doing this until the lows are above 40. I could be completely wrong but I'm not a big fan of tires sitting in 10 to 20° temperatures either on my front porch or in the back of a UPS truck. Or having the tire shop mount the tires in similar cold weather
Will those be your track wheels? Alternate with street?
Will those be your track wheels? Alternate with street?
Yeah that's the game plan.
I did 5 track days and 750 miles at Road America this past season. So that's about 25 heat cycles with the Cup2's and they're reaching the end of life for on track, but can probably use on street a bit more. But would hate to bring them to another track day.
I have found having dedicated track wheels/tires enhances both the track experience as well as the street experience, with less worrying and concern for each use case. Also keeps me more diligent in swapping brake pads and brake fluid, "while the wheels/tires are off, might as well flush the fluid...." Bendpak 4post lift and rolling jack helps that.
Also, I hate bringing the car (any car!) into a tire shop (especially with centerlocks). I'd much rather just bring the wheels in for new tires. Having an extra set of wheels/tires makes that possible.
Looks great! What made you decide on 245 vs 255 fronts?
I'm wondering the same. Is it because of pinching? I like 255 much better than 245 because it seems to fix the understeer issue but was told anything above 245 on a 9" wheel will cause pinching.
I'm wondering the same. Is it because of pinching? I like 255 much better than 245 because it seems to fix the understeer issue but was told anything above 245 on a 9" wheel will cause pinching.
Stock is a 245 on an 8.5, so a 255 on a 9" wheel would actually be a little stretched compared to stock.
In 19", the 245 has almost the same diameter as the stock front tire. As does the 285 rear. However, the 255/35 is shorter than the stock diameter front tire, so the 245/285 is better matched if you care about not disturbing rake and keeping the change in front/rear diameters roughly equal. Apex reports many using 255/285 with success, so it just depends if you care about that sort of thing.
Looks great! What made you decide on 245 vs 255 fronts?
I took Brandon’s advice as well as my track coach/race shop since this is my first go around with wheels and tire mods. I’m glad I did because the 245s barely fit mechanically without rubbing the inside plastics of the wheel well based on my current alignment. I likely won’t have time for new alignment for a few weeks. The 285s were the only choice with the matching set of tires. I could have done 295s but not decent front match. Also the rear wheels are the 10.5s and not the 11s as I have the TPC toe links which would need replacing… ugh so many rabbit holes!
First impressions though are that the ride is more compliant and the car feels sharper… I’ll know after a few canyon runs, mikes, etc…
I took Brandon’s advice as well as my track coach/race shop since this is my first go around with wheels and tire mods. I’m glad I did because the 245s barely fit mechanically without rubbing the inside plastics of the wheel well based on my current alignment. I likely won’t have time for new alignment for a few weeks. The 285s were the only choice with the matching set of tires. I could have done 295s but not decent front match. Also the rear wheels are the 10.5s and not the 11s as I have the TPC toe links which would need replacing… ugh so many rabbit holes!
First impressions though are that the ride is more compliant and the car feels sharper… I’ll know after a few canyon runs, mikes, etc…
Love that you are enjoying the wheels so far and can't wait for you to get them on track!
For everyone, keep in mind that the 255/35-19 and 265/35-19 are bother shorter than the 245/40-19 and OE 245/35-20 so they create even more room between the tire and fender liners despite the added width. With that said, improper caster values can create all sorts of fender liner clearance issues on any setup.
12-05-2023, 11:35 AM
