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08-11-2019, 02:19 PM | #1 | ||
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Best offset for 17x9 for AutoX/track?
Hey folks,
So I've been researching various 17x9 wheels lately and was wondering what is the "best" offset for things like AutoX and track days. There was a related question in the past: Quote:
Based on that response, I'm under the impression that the smaller the offset (less poke / more tuck) the better. APEX Race Parts say that the sweet spot is around ET40–42: Quote:
Titan 7 Wheels claim they purpose-build their wheels to specific cars, and for FT86 their T-S5 17x9 offering is +37. I'm a little confused here, to be honest. Some of the other concerns I've seen are:
In case it matters, I have CSG Spec TEIN Flex A pending install, so I might have a bit more room for the wheel if offsets even higher than +42 are beneficial. Also, I plan to run GT Radial SX2 245/40R17 for at least some time after I get 17x9s. Last edited by timurrrr; 08-17-2019 at 06:38 PM. |
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08-11-2019, 07:54 PM | #2 |
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I'm running +35 (+32 effective with a 3mm spacer), with about -3* of camber with stock struts and tein lowering springs.
Realistically, if you're asking this question, you're not actually good enough for it to matter. Since you have coilovers pending install, your wheel choice comes down to whatever you think is prettiest at the price you want to pay. |
08-11-2019, 08:24 PM | #3 |
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i have 6ULs with csg flex As. there is plenty of room to spare with my brembos, the coilover, and wheel well
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08-11-2019, 08:54 PM | #4 |
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+38 with 255/40 tires and -3.1* camber didn't rub for me on the track.
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08-11-2019, 09:28 PM | #5 |
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I rubbed a bit when really low with +42 and -2.7 camber. Id go +35 if possible. I just raised it a bit and put on 3mm spacers and have been good since.
If tracking/auotx you need camber anyway so inner clearance is the bigger need, hence the lower offsets |
08-11-2019, 10:14 PM | #6 |
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wheel setup
FWIW, I just installed +35 offset 17 x 9 wheels with 245/40/17 tires, they will poke some and the bad thing is you really can't dial in much negative camber up front at all or tire will hit the stock spring perch in the front, i don't know exactly how much negative camber i have but probably less than -1 and i only have a few mm maybe 3 from the perch just enough to barely slip a piece of cardboard in the space but snugly . i kinda wondered if my tires were oversized a bit (rivals)
i plan on going with coilovers shortly anyhow but just in case you were interested. I am not sure how Cole above is running that setup unless he has more narrow wheels and tires. Last edited by KevBRZ; 08-11-2019 at 10:24 PM. |
08-11-2019, 10:24 PM | #7 | |
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Quote:
My set up is as follows: RE71R 245/40/17 720Form GTF1 17x9 3mm spacer Tein S Tech springs Camber bolt in the top hole, set to max negative camber Silver Project top hats, also maxed for negative camber |
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08-11-2019, 10:32 PM | #8 |
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My bad , I was thinking maybe you had 17 x8 wheels and maybe 235 series tires, i only got a camber bolt in the bottom hole and if its maxed out i am literally hitting the perch. Weird. i had to back out the camber to clear the perch.
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08-12-2019, 12:02 AM | #9 |
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It all depends on how you get the camber, and your specific tire.
There is no one size fits all, if you want to push the limit. +37 is the size chosen for CSG spec TWS T66-F and Titan7, because that is the highest that will clear any reasonable variant of tire and camber modifier on stock suspension. |
08-12-2019, 10:42 AM | #10 | |||||
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Thanks everyone for the data!
Quote:
Quote:
Sure, just want to better understand the trade-offs and known good recipes before making a $1k+ purchase. Quote:
Quote:
Quote:
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08-12-2019, 10:49 AM | #11 |
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I have 17x9 +42 and 35.
The +42 will rub on the inner fender/front on the front. I have had 3 different sets of 245 or 255 on it and have slight rub. The +35 have never rubbed anywhere. |
08-12-2019, 10:50 AM | #12 | |
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Quote:
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08-12-2019, 11:00 AM | #13 |
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08-12-2019, 11:36 AM | #14 |
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You'll probably want camber plates, see:[/QUOTE]
Actually with 2 camber bolts on each side or 1 camber and 1 crash bolt you can get alot of negative camber , i am going to use coilovers that will have camber plates but i am going to try to get as much negative camber i can from the lower holes not the plates, they are slotted on the coilover so with just a crash bolt i might be pretty good and i don't think you are supposed to use camber bolts on coilovers due to slippage but i am by far not an expert on these matters lol |
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