04-25-2019, 02:27 AM | #23 | |
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Popular brands for tracking are enkei's, apex and the like. |
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05-02-2019, 11:31 PM | #25 | |
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05-08-2019, 09:51 AM | #27 | |
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OP's post says that tire size is ideally paired with 9" wide wheels? |
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05-09-2019, 12:16 PM | #28 |
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for a reasonably priced 18" street/occasional track set up, consider sportline 8s. 18x8.5, +32, 20.2lbs, 18x9.5(deep), +45, 19.8lbs on 245/40/18(23lbs), 265/40/18(26lbs), continental extremecontact sport tires. $1160 wheels, $780 tires, not including shipping, mount/balance, install.
your 403 wheels/tires weigh about 54lbs/57lbs. the sportline 8s with contis weigh 44lbs/46lbs. removing 10lbs at each wheel is a big deal. EDIT...another wheel is the TSW Bathurst. they are lighter than the sportlines and can be found for $1260 shipped on amazon in slightly different sizes. i've even found and bought tires shipped from amazon. with either wheel choice you could also consider consider square setups with 255/40/18 if you want tire rotation. Last edited by alohasurftoad; 05-09-2019 at 12:37 PM.. |
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05-09-2019, 01:20 PM | #29 | |
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For the optimum 255/40/18 square setup, the ideal wheel size all around would be 18x8.5 ET38 correct? For the wheels you mentioned, wouldn't I be better off just going for even lighter weight Apex ARC-8s? Pricing seems about the same. |
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05-09-2019, 06:20 PM | #30 |
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To me, the best size for 255/40/18 is 18x9 +35ish. Apex is fine, I'd rock them. I was just giving you some other choices. 255 /40/18 on 8.5 is a faintly oversized, nothing wrong with that and I prefer it to stretch for curbs. on 9" the 255 sidewall is square and will have optimum contact patch. It's unlikely you'd be able to tell the difference between 255 on 8 or 9, though.
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05-10-2019, 12:15 AM | #31 | |
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05-10-2019, 12:35 AM | #32 | |
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https://f30.bimmerpost.com/forums/sh...%2F4018+square EDIT...if i were to go arc-8 square i'd run 18x9.5 +35 with 255/40/18 square, turn-in sharpness is better since the tread width is narrower than the rim width, due to a mild stretch and you'd compromise just 0.4lbs for profile 3 concavity. it would still fit without rubbing or spacer. the links below have cars on 19x9.5 +35 square with 255, for visual reference. 18's would have a more sidewall but the tire and rim position would be the same. https://f30.bimmerpost.com/forums/sh...=18x9.5+square https://f30.bimmerpost.com/forums/sh...+square&page=2 Last edited by alohasurftoad; 05-10-2019 at 12:45 PM.. |
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05-11-2019, 01:39 AM | #33 | |
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I don't think I like the stretch look on 9.5 wheels. Makes me feel vulnerable with the wheels sticking out like that! lol EDIT: I heard using XL rated non run flat tires also help with duplicating the responsiveness that were present on the original Run Flat tires (?). Or just increasing PSI EDIT 2: I was watching this video on the new m340i: and I noticed that it looks like their wheel and tire set up looks similar to the stretch look on 9.5 wheels...hmmm has me thinking Last edited by ctbear; 05-11-2019 at 02:45 AM.. |
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05-11-2019, 03:27 AM | #34 |
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https://f30.bimmerpost.com/forums/sh...+squared+setup
here's 18x8.5 +35 SM-10 on 245/40/18 square. there's a lot of wheel/tire combos |
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05-11-2019, 03:08 PM | #35 | |
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05-12-2019, 01:33 PM | #37 | |
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https://support.apexraceparts.com/hc...-Fitment-Guide Hmm guess oem square 225 tires offer sufficient traction for stock N55 power... Debating if I should stick to oem specs so as not to throw off the original balance of the vehicle tuned from the factory. My m-sport package is 19" staggered so I could just swap it to oem 18" square setup. |
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05-12-2019, 09:36 PM | #38 | |
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here are pics of 442M, front tires size changed from 225/40/19 to 245/35/19 on the 19x8 +34. rear size remained oem 255/35/19(max on 8.5"). michelin pilot sport 4s. you need to increase front grip to reduce understeer on the track. staying with stock offset is good because the front track width is wider than the rear, which is better for handling as well. i'd try this tire change 1st. you might be satisfied with the performance and ride with go-flat max performance tires, such as michelin pilot sport 4s or continental extremecontact sport, assuming you still want street tires. |
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05-12-2019, 09:48 PM | #39 | |
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05-12-2019, 09:58 PM | #40 | |
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05-14-2019, 02:40 PM | #41 |
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I run Nitto NT01's and i love them on track, even on the street they are great, they dont take too long to heat up and deal with the heat very very well.
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06-19-2019, 09:46 PM | #42 |
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Been a while since I've checked in on this thread, so I've got a couple updates to share.
First, with the Apex ARC-8s in 18x9.5 et35 and RE-71Rs in 265/35-18 that I got back in 2017 were a perfect fit with no spacers. Of course, I do run about -3.0° camber in the front, so if you're running much less than that, then fender clearance will be an issue. This tire size was a perfect fit on 9.5" wheels; I think 275 would have been a bit squishy. (On my previous set of wheels, 18x9 Apex ARC-8s, I had run both 245s and 255s, and both felt very good.) Fast forward to earlier this month, and I've just successfully squeezed in a set of BimmerWorld TE-AL TA16 wheels in 18x10 et33 with RE-71Rs in 275-/35-18. It needed a mild fender roll/pull both front and rear, and a 5mm front spacer to make everything clear, but after a 2-day track event this past weekend with zero rubbing, I can say that it was absolutely worth the effort... the car had tons of grip, felt nimble and responsive, and balance was as good as ever. I think this size tire is the sweet spot for a car of this size/weight; for the first time, I felt like the grip and traction overshadowed the power. So to circle back to the original question I posed in this thread, as a general rule, from what I've learned, for best grip and feel on track, I think that max/extreme performance summer tires match up best to wheel sizes where the section width of the tire within ~1" inch wider than the wheel... so this breaks down roughly as follows: 8.0" -- 225 8.5" -- 235 9.0" -- 245/255 9.5" -- 265 10.0" -- 275 10.5" -- 285 (It's worth noting that Dunlop Direzzas run a bit narrow, and Hankook R-S4s run a bit wide, so it may make sense to adjust accordingly to keep the tire section width within ~1" of wheel width)
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06-20-2019, 11:10 AM | #43 |
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I'll add a data point with some alignment dependency.
I have Apex SM-10 18x8.5 ET35 up front with NT01 245/40r18 tires. My negative camber has been around -1.6 to -1.8deg and I asked for caster set at 8deg (one wheel was 8, the other was 7.6deg). This hasn't been an issue at Thunderhill or Sonoma, but last time at Laguna Seca I found out that track gives me more front compression than the others. At some of the heavy compression sections (like the dip just before the crest and drop of the T8 corkscrew) I was getting rubbing on the wheel liner at the 10 o-clock position (driver side, 2 o-clock passenger side). This only happened to the wheel at 8deg caster, the wheel at 7.6deg caster didn't see rubbing anywhere.
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06-20-2019, 11:33 AM | #44 | |
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