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So I am thinking about getting another set of wheels like my current ones in picture for AutoX use. The rears are stock 19x12 and the fronts are 1/2 inch wider than stock 18x10. Several members have confirmed that the 275 (NTO1) I currently have on my 18.9.5 will be fine and like work better on the slightly wider wheel.
My question is that these new wheel have a different offset than stock. They bring the wheel out and tire flush with the fender making the over all stance wider than stock. In theory should I get better performance from the wider stance?
not much from the track change itself, although it will change the scrub radius and probably change the feel, possibly making the handling a bit twitchy on turn in
not much from the track change itself, although it will change the scrub radius and probably change the feel, possibly making the handling a bit twitchy on turn in
Could you explain why you think handling could be "twitchy on turn in" ?????????
The wider offset feels great and well planted with my stock MPSS tires but they are wider 19x345 and 18x285. And the feel was different at first but feels great now.
The scrub radius is the distance between the center of the tire at the ground and a line drawn through the upper and lower ball joints. When you change the offset it will increase the distance between these two points and that will change the force against the wheel & tire assembly all things remain the same until you turn the wheel to one side or the other. Then it will change. This might be good, bad or not noticeable.............no way to know other than a real serious math project or simply try it & see
Different car, but on my old T1 C5Z I had my rains mounted on a slightly wider set than the F14s I was running. Car honestly felt terrible, everything was worse. Never actually ran in the rain, but did a few damp sessions with them at thunderhill. That said, every car is different and clearly the cars are too, maybe it’ll work great on your car
The scrub radius is the distance between the center of the tire at the ground and a line drawn through the upper and lower ball joints. When you change the offset it will increase the distance between these two points and that will change the force against the wheel & tire assembly all things remain the same until you turn the wheel to one side or the other. Then it will change. This might be good, bad or not noticeable.............no way to know other than a real serious math project or simply try it & see
Well I'm not interested in the math project
And I'm not sure I'm interested in buying wheels that MAY not perform as well as OEM offsets
Different car, but on my old T1 C5Z I had my rains mounted on a slightly wider set than the F14s I was running. Car honestly felt terrible, everything was worse. Never actually ran in the rain, but did a few damp sessions with them at thunderhill. That said, every car is different and clearly the cars are too, maybe it’ll work great on your car
You say wider set, just want to make sure you understand I'm talking about basically the same wheel size just WIDER OFFSET, right?
And I am doing AutoX (don't do open track since I put my last car into a wall). So I am actually worried about the wider offset bringing the wheels flush with fenders any being harder to avoid cones !!!!!!!
You say wider set, just want to make sure you understand I'm talking about basically the same wheel size just WIDER OFFSET, right?
And I am doing AutoX (don't do open track since I put my last car into a wall). So I am actually worried about the wider offset bringing the wheels flush with fenders any being harder to avoid cones !!!!!!!
DH
Thats what I meant by wider set. Both were 18x10.5, but 1 set meant specifically for the Corvette, the other set I robbed off my Camaro. Sorry to hear about that, always enjoyed seeing your jet stream blue Z at track days
Thats what I meant by wider set. Both were 18x10.5, but 1 set meant specifically for the Corvette, the other set I robbed off my Camaro. Sorry to hear about that, always enjoyed seeing your jet stream blue Z at track days
Thanks, that was 4 yrs ago ...... Wall of Champions at Button Wilow!!
For what it's worth, I kinda did the same thing, but took a different approach.
I wanted to run 325's out back, but did not have the clearance I was comfortable with on my C5Z because the rear cradle is offset badly (like 1.2* camber delta with equal plates on both sides). I didn't want to tub the chassis because it is a PITA, and expensive.
I had CCW build me a set of standard 18x12's except I had the entire barrel moved out 1", yielding a 1" lip. The resulting backspacing is 8.25". My experience with this setup has been very positive. I run 1/16 rear toe in, and the back side is very well planted. I did but rear fenders with wider flares (Carbon Creations); cheaper and way easier than tubbing. I have since ordered 2 more sets of rears.
For what it's worth, I kinda did the same thing, but took a different approach.
I wanted to run 325's out back, but did not have the clearance I was comfortable with on my C5Z because the rear cradle is offset badly (like 1.2* camber delta with equal plates on both sides). I didn't want to tub the chassis because it is a PITA, and expensive.
I had CCW build me a set of standard 18x12's except I had the entire barrel moved out 1", yielding a 1" lip. The resulting backspacing is 8.25". My experience with this setup has been very positive. I run 1/16 rear toe in, and the back side is very well planted. I did but rear fenders with wider flares (Carbon Creations); cheaper and way easier than tubbing. I have since ordered 2 more sets of rears.
Your mileage may vary.
So your front and rear wheel sit further out than before and your handling is good, right?
Thanks for your feedback.
Fronts are 18x11, standard CCW backspacing. I am not doing anything special up front. The car is planted. Its home track is Watkins Glen, when the fangs are hanging out, and Pirellis are on the wheels, it is capable of mid 2:06's, add 1.5 seconds for Continentals. Does not suck too bad ;-) Through the turns it catches most well piloted vehicles, those with more displacement will pull me on exit (C6, C7).
Of course, cars with beyond stock downforce, and a good driver, will dust me in the high speed corners. For a C5Z, it is an awesome ride.
Putting an Dry Sumped LS3 in it now, hopefully it will be more evenly matched on power with the newer toys that are out there.
They stick out about 5/8" farther than stock front and 3/8" rear. Probably not going to be too noticeable if any. I wouldn't worry.
Yea that seems right. I would have guessed about 1/2 inch. I could post better pictures of current offset being flush with fenders if anyone wanted to see.
I took some pictures to show the wider offset of my new wheels compared to stock. They do have 345/285 rubber which is wider than stock.
Guess I'm going to have to put some tape on fender liner then drive the **** out of it and see if I have fender/tire contact. If its very slight then I won't worry running the stock 325/275 NTO1 at AutoX
11-15-2018, 01:02 AM
Wider Wheel Offset = Better Performance?
not much from the track change itself, although it will change the scrub radius and probably change the feel, possibly making the handling a bit twitchy on turn in 
