03-21-2017, 12:20 PM | #1 |
Cal
Drives: 2017 6th Gen Camaro ZL1 Coupe M6 Join Date: Sep 2013
Location: Newport, NC
Posts: 779
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6th Gen ZL1 Drag Strip Wheel & Tire Options
After exhaustive research and meticulous measurements, I've narrowed the field to the following rims and tires for use at the drag strip with my 2017 ZL1. I need more rim options, though. See measurements and clearances near bottom.
There are several questions I have, related to the information I've collected. These are highlighted below with bold, red underlined heading "Question:". I'd be grateful if someone would kindly answer these. Thank you in advance for suggestions, references, or comments. --Cal Webster [UPDATES 20170405] 1. A new photo illustrations have been added in "Clearances" section below. 2. The "Fitment Calculator" link and results have been updated to reflect the wheels/tires I purchased. 3. Additional cautionary notes were added after the Fitment Calculator regarding clearance for wider tread width. 4. See post #2 below for answers to questions. 5. See "11's on Street Rubber Post #43" for details on what I ended up buying. [/UPDATES 20170405] [Wheels] According to my measurements and research, I'd like to get 18x12" rims to maximize tread width and sidewall height. I'd prefer to get some that look similar to the stock 20x12 rims but these are difficult to find. The rims below are from Weld Tech, a highly recommended brand by others in the Camaro6 forums. However, the widest 18's I can find are only 11". Mickey Thompson says you can use tires that are +- 1-inch difference in width but I'd prefer to get the same width and offset/backspace as the stock rims to ensure proper clearance and maximize tire options. These look nothing like the stock rims either. They cost more than I really wanted to pay too. Neither do I like having to wait a month to get them. Wheel model name below links to the Weld Tech web page. Suggestions and recommendations here would be most welcome. Weld Tech S76B Wheels Code:
Price: $705.20 Make: Weld Tech Model: S76B Size: 18x11 Color: Chrome with black painted spokes Backspace/offset: 7.6"/41mm Bolt pattern: 5x4.75 Pad Height: high Availability: 3-4 Week Lead Time Details WELD Racing brings its application flexible racing technology to the street with a budget friendly 3-pc modular wheel using a unique welded assembly process. This wheel has the classic WELD Racing look and continues the WELD Racing tradition utilizing a forged billet center and cold forged rims. This unique wheel offers 3 mounting pad heights to clear specific drum and multi- piston opposed calipers. – Center is available in black anodized – Wheel widths from 4.5" to 18" with a wide variety of back spacings – 15" Require shank lug nuts – 17", 18", and 20" require conical lug nuts – Center cap and valve stem included – Beadlock availble on 15" and 17" RT-S Wheels. Call a WELD Dealer more info – Made in Kansas City, USA Question: I'm a little leery of the "medium" pad height option with these big Brembo 4-piston rear calipers. Anyone know how this compares to Chevy's stock, forged aluminum rims? According to my measurements, I'd still have 1/4" clearance with 18" rims of construction similar to stock. Construction of these is unlikely to be similar to stock rims, though. Going from 20" to 18" doesn't give me much calliper room to play with. They show the following other backspace/offset options. Code:
BS / Offset in mm 7.6 / 41 6.7 / 18 7.7 / 43 8.2 / 56 [Tires] Mickey Thompson has a good reputation and many have recommended their tires so I've listed the tires from their web site that would fit 11" or 12" rims. Based on my clearance measurements (see "Decision Summary" and measurements below) it seems I'm limited to a max of about 28" wheel height. I'm assuming these numbers (i.e. 27X13.50R18) are for unloaded tire. Tire model names are linked to their page on the MT site. ET STREET R - STREET LEGAL DRAG TIRE Code:
A drag tire that can be driven on the street. ET Street R from Mickey Thompson is a D.O.T street legal drag tire with proven race compounds and incredible traction. D.O.T. approved for street use Minimal Tread Void provides excellent tread-contact Available in most popular sizes Tubeless construction provides lead-free seal without the expense and hassle of tubes ----------- Size Wt cmpnd rim sec tread O.D. circ. Matl # Part # width width P325/35R18 27X13.50R18 TBD R2 11.0 0.0 0.0 TBD TBD 90000028455 3581 P305/45R18 29X12.50R18 32 R2 10 11.8 10.7 29.0 91 90000024661 3580 The 27" high P325/35R18 tire shows 27X13.50R18 size. If I go with the Weld Tech wheel above that would seem to risk rubbing the fabric liner in the forward, inboard corner of the wheel well. There's only about 1" clearance with stock 12" tires. The 29" high P305/45R18 tire shows 29X12.50R18 size. While the 12.50" width would very likely clear the liner in the front inboard corner, the additional 2" height would likely rub the liner's front wall. There's plenty of room (3-5") along the top and rear of the liner. Question: Is this a (flexing sidewall) slick or a (stiffer side-wall) DR? I have trouble making the distinction, what with all the tire options available. ET STREET S/S - STREET TIRE FOR THE DRAG STRIP Code:
A street tire that can be driven on the track, the ET Street S/S from Mickey Thompson is a high performance street to strip tire with radial construction, R2 compound and more; 15- to 20-inch fitments. D.O.T. approved for street use Equivalent Tread Void as the ET Street Radial II, redistributed for improved hydroplane resistance while providing plenty of tread contact for excellent dry traction Proven R2 compound, the same proven compound used on the quickest “drag radials” on the planet provides superior traction at the strip with little or no burnout required Tubeless construction provides leak-free seal without the expense and hassle of tubes ------------- Size Wt cmpnd rim sec tread O.D. circ. Matl # Part # P275/45R18 28X11.50R18 32 R2 9 11.3 10.0 27.8 87.3 90000028443 3484 P305/35R18 26X12.50R18 33 R2 11 12.2 11.2 26.6 83.6 90000024570 3480 P285/40R18 27X11.50R18 29 R2 10 11.3 10.5 26.9 84.5 90000024571 3481 P305/40R18 28X12.50R18 33 R2 11 12.2 11.1 28.0 87.9 90000024572 3482 P345/35R18 28X13.50R18 38 R2 12 13.5 12.4 27.8 87.3 90000024573 3483 [Decision Summary] Minimum Rim Diameter: 18 inches A 2-inch reduction in rim diameter would bring the inside circumference 1" closer to the caliper, leaving 1/4" clearance - assuming similar construction to stock rims. Maximum Rim Backspace: 8 inches Backspace of 7 5/8 inches for the stock rims leaves at least 2-inches of clearance from all brake and suspension components. However, with stock rim/tire combo there is only about 1 inch of clearance at the fabric lining inside the fender well on the forward, inboard corner. This corner is shaped at a radius similar to that of the tire, so a 1/2 inch increase to backspace and/or tire height is as close as I'd dare to push it. The new 2018 ZL1 1LE boasts 13-inch wide tires so I have to assume they've modified the lining or sheet metal in the fender wells, rims, or suspension to accomodate them. Maximum Tire Height (loaded): 27.5 inches (or about 28 inches unloaded) Based on the below measurements, there's at least 2" of room from the rim to any obstruction inboard of the wheel. However, the limiting factor is going to be the 1" of clearance at the inboard front corner of the wheel well. However, that corner is curved like the tire so adding 1" of backspace or height would probably only consume about half that clearance. Question: Tire Pressure Monitoring System (TPMS): Where's the best place to buy TPMS sensors for my new rims that are compatible with the 6th Gen ZL1's system? How often do batteries need replacement? [Rear Wheel Clearances/Measurements] (with stock rims/tires) Specs/Measurements: Rims: Code:
Description: (Stock) 5-spoke, split-spoke, black, forged alluminum Size: 20" Dia. x 12" Width Offset: 1.69291" (43mm) (All the Facts: 2017 Camaro ZL1) Backspace (calculated): 7.69291" (195.399914 mm) (based on 43mm offset) Backspace (measured): 7 5/8 (7.625" or 193.675 mm) Lug spacing (measured): 5 x 2 13/16 (2.8125" or 71.4375 mm) Lug spacing (stock spec): ??? Wheels: Code:
Make: Goodyear Model: Supercar F1 G3 Spec: 305/30ZR20 SL Load rating: 99 1,709 lbs (775 kg) per tire Speed rading: Y (over 186 MPH or 300 KPM) Max pres: 51 PSI Uniform Tire Quality Grade (UTQG) Standards Tread wear: 220 (moderate) Traction: AA (Above 0.54 G's) Temp (dissipation): A (highest - over 115 MPH) (measured from original equipment wheels/tires) Brembo caliper -> inside rim: 1 1/4" Wheel (rim) width: 12" (305 mm) Mount flange -> outboard edge: 4 3/8" (4.375" or 111.125 mm) Mount flange -> inboard edge: 7 5/8" (7.625" or 193.675 mm) (backspace) Tire outboard edge (prot. lip) -> fender top inside surface: 1/8" Wheel outboard edge -> fender top inside surface: 3/8" Tire height loaded: 26 1/2" (unloaded about 27") Tire Clearance inside fender well (tightest fit): Top: 5" Inboard: 3-4" Rear: 2" Front: 1" (inboard corner) Rear stabilizer bar (behind wheel): 2" Brake fluid line (behind wheel): 2 1/2" Fitment Calculator: Updated 20170405 Code:
Existing: Tire: Width Profile Diameter 305 30 20 Rim: Width Offset 12 43 New: Tire: Width Profile Diameter 345 35 18 Rim: Width Offset 12 43 Results: Existing New Diameter 691mm 698.7mm Circumference 2170.8mm 2195mm Poke 109.4mm 109.4mm Inset 195.4mm 195.4mm Speedo error 0% -1.1% Reading at 30mph 30mph 29.67mph Reading at 60mph 60mph 59.34mph Ride height gain 0mm 3.85mm Arch gap loss 0mm 3.85mm Compared to your existing wheel, this new wheel will have an inner rim which is the same distance from the suspension strut as your current wheel. The outer rim will poke out the same as before. !!! New Tires could be a tight fit at the inboard, front corner of the wheel well. If MT specs are correct, new DR tread will be only 0.2" closer to the inboard, front corner of the wheel well; based on the stated tread width. This should be no problem, leaving over 3/4" clearance. If we go by the tire size numbers (305 vs 345) it will be 3/4" closer at that point, leaving barely 1/4" clearance. MT specs show a 13.5" section width (sec. width) for this tire, which corresponds to 343mm but this is measured at the center of the bluge on the sidewall (See TireRack.com illustration). Original tread width: 12.00 in. (305mm) New tread width: 12.4 in. (315 mm) Difference of 0.4" / 2 for one side: 0.2" I'll Update this thread when I put them on and measure clearances again. --Cal Last edited by cwebster; 04-05-2017 at 12:31 PM. Reason: Add Updates |
04-04-2017, 12:34 PM | #2 | |||||
Cal
Drives: 2017 6th Gen Camaro ZL1 Coupe M6 Join Date: Sep 2013
Location: Newport, NC
Posts: 779
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Update
Well, I guess I'll have to answer my own questions. There's not much that's more disappointing than to find a post that exactly matches my problem but leaves the questions unanswered. This is for future drivers looking for answers...
I nixed the Weld Tech wheels because I couldn't get sizes to match my needs (18"x12", 43mm offset w/high pad height). In fact, I could find no US supplier with wheels this size. If I'm going to spend this kind of money I don't want to compromise my standards. I ended up gettIng BC Forged RS40-14 18"x12" monoblock wheels with 43mm offset and high pad clearance and Mickey Thompson ET Street S/S P345/35R18 drag radials. See this post for details: 11's on Street Rubber (post #43) Answers to Questions: Quote:
Quote:
Regarding the "ET Street R": Quote:
Quote:
433MHz Tire Pressure Sensor I still don't know how long the batteries last. Hopefully, at least until the tires wear out. Quote:
I'll be updating the original post with photos from my most recent wheel swap so you can see how much clearance there really is. If not for the proximity of the fabric wheel well liner in the front inboard corner, I could have even gone with 13" wide tires and rims. There is only about 1" clearance on this corner with the stock 12" wide F1 G3 tires. Any tire taller than about 28 1/2" or wider than 12" risks rubbing on that corner. Let me know if any of this is unclear or there are still unanswered questions. --Cal Last edited by cwebster; 04-05-2017 at 12:33 PM. |
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11-26-2017, 09:19 AM | #3 |
Drives: 2018 ZL1 A10 Nightfall Gray Join Date: Apr 2016
Location: Indiana
Posts: 104
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I came across this post while doing a search for backspacing, according to my research we can fit 17 inch wheels on the ZL1s with 40 - 43 mm offset or 7.7 inch backspacing.
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11-26-2017, 09:31 AM | #4 | |
CamaroFans.com
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I really wish this thread would have taken off and now that more have had time to actually get wheels maybe it will. |
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11-29-2017, 12:17 PM | #5 |
Drives: 2019 Chevy Camaro ZL1 A10 Join Date: Sep 2017
Location: California
Posts: 129
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For the 2017-2018 ZL1 Camaro you can run 17x10" with 44mm offset and 7.2" back spacing on the Weld Racing Wheels. I'm Running those and 20x7.5" wheels up front. I purchased the welds from Carlyle Racing. For those of you that want to buy Billet Lug nuts they are 14mm connical which were also purchased from CarlyleRacing.
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11-29-2017, 12:24 PM | #6 |
Drives: 2019 Chevy Camaro ZL1 A10 Join Date: Sep 2017
Location: California
Posts: 129
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Drag Wheels
The wheel on the Scale is a 20x7.5" weighs in at 22.2lbs The 17x10" wheel weighed in at 24.2lbs with the Bead lock ring on. |
12-01-2017, 08:18 AM | #7 |
Drives: 2019 Chevy Camaro ZL1 A10 Join Date: Sep 2017
Location: California
Posts: 129
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Ok I just test fitted the welds 20x7.5" and 17x10" and they fit. However the 255/35R20" Mickey Thompson Tire that Andy@CarlyleRacing told me to get does not fit the 20x7.5" wheel. The only other option from Mickey Thompson is the 245/45R20 tire. I ordered those last night and they should fit this time. I'll post an update if they do not fit. The tire size recommendation says it will.
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02-10-2018, 01:40 PM | #8 |
VIN #2G1FT1EW6A9100074
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2017 1LT OEM tires blow in the snow. So... completely off the wall... I have a set of Blizzaks almost brand new from a Charger my old man totaled. 235/55/19 That puts the tire height at 29.2 vs OEM 27.7 if I bought a set of aftermarket 19" rims. +1.5" is a hell of a lot (don't care about the speedo). Would they fit or not? .75 bigger radially Hey, $700 in tires is $700
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11-21-2018, 04:44 PM | #9 | |
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2010 2SS Camaro (sold) 2010 ZL 427 Camaro (sold) 2012 ZL-1 Camaro (sold) 2018 ZL-1 Camaro |
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11-21-2018, 10:59 PM | #10 |
Horsepower whisperer
Drives: Camaro Join Date: Jun 2017
Location: MO
Posts: 185
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Carlyle racing 15” kit
Fitting 325/50/15 Nitto on forgestars |
09-17-2019, 05:14 PM | #11 |
Drives: 2017 LT1 Camaro Join Date: Sep 2019
Location: kendelville Indiana
Posts: 1
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advice on wheels
I have a 675 horse ZL1. I wanted to get more tire on the road. I heard weld makes a good wheel lokking for a 16 or 17 inch rears. Just wondering if anyone has used a weld 17x10 rim? what other options for wheels are out there. I have factory brakes currently. also if any one has suggestons on a good tire and wheel size combo. I really like how the car rides now but I I just want it plant them tires better. Any good feedback would be appreciated. This is for a 2017 ZL1
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09-17-2019, 10:11 PM | #12 | |
CamaroFans.com
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Quote:
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09-17-2019, 10:46 PM | #13 |
Drives: ZL1 1LE Join Date: Oct 2018
Location: NYC (almost)
Posts: 339
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https://4aah2h38qz0d1pp9jb46vzfw-wpe...Guide-2018.pdf
17x9.5 will fit on the rears with no modifications (see link). My question is whether the MT 315/50/17 (30”) tire would fit. 305/45/17 MTs were on a member’s car and look to be the max size that will fit without mods. Pic is @xCROOKS______x‘s car |
09-18-2019, 11:36 AM | #14 |
Horsepower whisperer
Drives: Camaro Join Date: Jun 2017
Location: MO
Posts: 185
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There is quite a gap on the SS on stock suspension even with 325/50/15
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