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Wheels 17x8.5 40mm with tires 235/45 - fits stock w plenty of clearance

3348 Views 29 Replies 12 Participants Last post by  thomason2wheels
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After many wasted hours reading forums, checking fitment calculators, comparing against my spreadsheet, i pulled the trigger.

In less than 24hrs, tirerack delivered my goodies

Kosei K1 17 x 8.5 40mm Offset
Tires are Falken RT660 235/45R17

Assembled combo 200grams heavier than stock premium wheels config. That's what, 1/2 beer in American units?

Tires are hair taller than stock.

Stock camber as measured from my Dixie angle gauge: -0.5 front, -1.7 rear

Front strut clearance drops to about 8mm or just shy of the wide side of a construction pencil.

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Thanks for sharing I was looking at the exact same setup! Can I get a picture from a side angle? Are you on stock suspension?

I am a little surprised they weigh about the same as stock, tire rack advertised them as 16lbs didn鈥檛 they? Is that all larger tire weight?
Like side view? I'll have to drag it out of the garage for that - I plan to add pedders top mount and camber bolts tomorrow or at least the camber bolts up front.

RT660 235 45 R17 is 25 lbs each - making these 17.7 lbs
stock PS4 is 20 lbs. stock wheels 22 lbs?

225 45 is only 1 lb less per tire rack.. so i figure slightly wider tire for 1 lb was worth it.

You can save 2 lbs with RE71RS, but pay $50 per tire more. #decisions :)

Stock suspension for now.
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Thanks for all the info, this was really helpful. Here's a snapshot with more numbers for you. You probably know all this but I'll post it anyway:
Yes, if you don't mind posting a picture of a side view of the front and back. I just want a realistic view of the wheel gap in the fender from a larger tire.

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Nice-looking wheels. (y)
Thanks for all the info, this was really helpful. Here's a snapshot with more numbers for you. You probably know all this but I'll post it anyway:
Yes, if you don't mind posting a picture of a side view of the front and back. I just want a realistic view of the wheel gap in the fender from a larger tire.

View attachment 23181
What website is this?
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Side and 3/4 view. Next up... camber adjustments.

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I've seen website before.. they want like $20 for check fitment for you.. in theory anyway. Probably "cheaper" than hours plugging numbers in your own spreadsheet.

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Side and 3/4 view. Next up... camber adjustments.

I've seen website before.. they want like $20 for check fitment for you.. in theory anyway. Probably "cheaper" than hours plugging numbers in your own spreadsheet.
I paid like 4-5 bucks for the site. Those wheels look great. Let me know if you want me to plug in any camber calculations on wheel it fit so you can see the diagram front and back.
nice wheels! i loved having them on my e30 and e36
Thanks for sharing, these wheels are on my short list as there are not many good looking 17x8.5 with acceptable offset. 8.5 width seems perfect for these cars as you can run a 225-245 width tire without issue. Look great too, not sure if they would look as good against white car.
If I recall correctly, they are available in gloss black as well. I would have gotten white if that was option for nostalgia reasons.
If I recall correctly, they are available in gloss black as well. I would have gotten white if that was option for nostalgia reasons.
Did you use hub centric rings? Right, wish they had additional color offerings on this wheel... but for the price/weight they are unbeatable it would seem, except RPF1 which every car at the track/meet/grocery has on their car... Not hating though.
None required. Appears CB is same as stock - surprised me :) RFP1 was close second choice.
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Gorgeous day in March for Auto-X

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Stupid question but how did you buy a custom wheel size from Tire Rack? It keeps trying to sell me the default GR86 size.
Not sure about mobile, this is on PC (desktop website experience).

Shop Products / Wheel and Tire Packages / Shop Tire Package, now enter year make model / default right now may still be winter wheel packages -- change to regular "tire & Wheel Packages" / view results

From start using filters on left to select diameter ( 17 in my case ) and width: 8.5 and then offset: 40 - that should leave you 2 options, black and silver Kosei K1. -- Add to Package

Now you get to tires - you have to change tire size as it defaults to 215/45-17 "Change Tire Size" 235, 45 and "View Results" I knew I wanted Falken, so I selected that filter. After that... Add to Package, decide if you want TPMS sensors and.. ship to home or your favorite installer.
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I鈥檓 looking at the same wheel with a 245/40/17 RE71RS. My car is stock suspension, no camber modifications. Wondering if it鈥檒l fit with the slightly wider tire.

Were you able to use the camber bolts, or needed spacers?
With those tires.. unless dead set on stock class, you'll want camber.

I used both pedders top mount and spc upper camber bolt. In rear spc lower control arm.
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Thanks for all the info, this was really helpful. Here's a snapshot with more numbers for you. You probably know all this but I'll post it anyway:
Yes, if you don't mind posting a picture of a side view of the front and back. I just want a realistic view of the wheel gap in the fender from a larger tire.

View attachment 23181

What is this? Is this an app or website anyone can use?
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