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Old 06-15-2021, 07:50 AM   #1
Gel Mibson
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Chapter/Region: Tri-State
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2018 LBP WRX Ltd.
2005 PSM WRX - St.2 (rip)

Default 08-15 STi bbk upgrade on my 2018 WRX. help

i'm running 2 sets of wheels (summer/winter) currently. i have a set of 2015 STi BBS forged wheels for summer and stock wrx wheels for winter. i'd like to upgrade my brakes and get the 08-15 STi BBK (black STi calipers). after looking at the wheel megathread (https://imgur.com/4VNkWTF), i don't understand how the 4pot BBK doesn't clear the 18" stock wrx wheels when the wheel dimensions are identical? i'm not a wheel expert, so can anyone help an idiot?
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Old 06-15-2021, 08:13 AM   #2
ntg44
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2020 WRX STI

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Same dimensions, but inner diameter of the barrel may be smaller or spokes are a different shape that may hit the caliper so you wouldn't be able to mount them to be flush with the hub. There's more to a wheel than outer diameter, width, and offsets.
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Old 06-15-2021, 08:46 AM   #3
Gel Mibson
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2005 PSM WRX - St.2 (rip)

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ah thank you. i'd figure the inner diameter of the barrel would be identical considering the rest of the measurements are the same. sad
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Old 06-15-2021, 09:08 AM   #4
ntg44
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Quote:
Originally Posted by Gel Mibson View Post
ah thank you. i'd figure the inner diameter of the barrel would be identical considering the rest of the measurements are the same. sad
It may not be the end of the world. It's possible that the inner diameter clears, but the spokes hit from the side, in which case you could find the smallest spacer possible to be able to fit them on. It may only be 5-10mm, which you could also use with the BBS wheels, or use pass-through lug nuts and take the spacers off for the BBS wheels so you don't need to swap out studs every time.

Just giving options
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Old 06-15-2021, 11:28 AM   #5
Gel Mibson
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Chapter/Region: Tri-State
Location: NJ
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2018 LBP WRX Ltd.
2005 PSM WRX - St.2 (rip)

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I just settled and got the 4-2 pot brake kit..mainly cause I stubbornly want to keep all my upgrades oem.
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Old 06-18-2021, 11:33 AM   #6
4stringsquire
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I have a 19 wrx premium and did the 08-17 sti brake swap a few months ago. The 18” wheels need a 5mm or larger spacer to clear the front caliper. The spoke design on the 18” wrx wheel from 18-19 will contact the brembo 4pot caliper. Subaru changed the wheel design slightly on the 2020 to clear.
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