Kosei K4R 17x7.0 +50 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

C4RBON · 03-23-2017, 08:59 PM

I picked up a used set of Kosei K4R wheels for street-class autocross. I don't see these listed in the wheel directory yet, so I figured I'd make a thread in case anyone else is considering these wheels.

Specs:
- 17x7.0"
- +50mm offset
- 5x100 bolt pattern (Note: The wheels have the text "5x114.3" cast into the front. I have seen this on several sets of K4R wheels. It's just the way it is. The label on the wheel barrel says 5x100).
- 14.0 lbs according to TireRack. My bathroom scale says 14.2 lbs (without wheel weights or center cap).
- 9 spokes
- Made in Japan
- Tilt-cast spokes and flow-formed barrel

As of March 2017, you can purchase these new from TireRack for $199 each.

Pics on car:

Pictures of wheels:

Somerandom18 · 03-23-2017, 09:43 PM

Been wanting these for years! ❤️

NE Ohio represent.

churchx · 03-23-2017, 09:58 PM

That's very light for cast wheel. And at such budget price. Would be nice to see offset at least no less then stock though.

C4RBON · 03-23-2017, 10:43 PM

Quote:

Originally Posted by churchx

That's very light for cast wheel. And at such budget price. Would be nice to see offset at least no less then stock though.

I agree. I was planning to get RPF1's since they have the minimum street-class legal offset of +42mm offset. However, this set came up locally for $200 and I couldn't pass them up. Everyone else has RPF1s, anyway. I am seriously considering getting some extended studs and 5mm spacers to get to +45mm. But that is ~$120, which further erodes the savings I realized by getting these used Koseis instead of new Enkeis.

Apoc · 03-25-2017, 06:43 PM

Kosei K4R 17x8 +36 have been in the Directory for nearly 5 years. There are threads on your exact wheel. Your search foo is not strong

http://www.ft86club.com/forums/showthread.php?t=9334

Cole · 03-25-2017, 06:49 PM

Quote:

Originally Posted by Apoc

Kosei K4R 17x8 +36 have been in the Directory for nearly 5 years. There are threads on your exact wheel. Your search foo is not strong

http://www.ft86club.com/forums/showthread.php?t=9334

Didn't realize that a +50 offset was the same as a +36 offset. Or that a 7" wheel is the same as an 8" wheel

Apoc · 03-25-2017, 06:58 PM

Quote:

Originally Posted by Cole

Didn't realize that a +50 offset was the same as a +36 offset. Or that a 7" wheel is the same as an 8" wheel

I never said it was. There are threads for this exact wheel that are 3 years old so my point is that it isn't new or a surprise

http://www.ft86club.com/forums/showthread.php?t=66115

imnotsureaboutbrz · 03-25-2017, 07:13 PM

Quote:

Originally Posted by Apoc

Kosei K4R 17x8 +36 have been in the Directory for nearly 5 years. There are threads on your exact wheel. Your search foo is not strong

http://www.ft86club.com/forums/showthread.php?t=9334

As they OP meantioned these are for Street class autocross where you change your offset by +\- 7mm, rim size +\- 1in and width must by unchanged...

**OP what tires are you running? Re71r's?

03-23-2017, 08:59 PM	#1
C4RBON Senior Member Join Date: Mar 2011 Drives: '15 BRZ, '19 GTI Location: USA/Iowa Posts: 204 Thanks: 77 Thanked 163 Times in 79 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Kosei K4R 17x7.0 +50 I picked up a used set of Kosei K4R wheels for street-class autocross. I don't see these listed in the wheel directory yet, so I figured I'd make a thread in case anyone else is considering these wheels. Specs: - 17x7.0" - +50mm offset - 5x100 bolt pattern (Note: The wheels have the text "5x114.3" cast into the front. I have seen this on several sets of K4R wheels. It's just the way it is. The label on the wheel barrel says 5x100). - 14.0 lbs according to TireRack. My bathroom scale says 14.2 lbs (without wheel weights or center cap). - 9 spokes - Made in Japan - Tilt-cast spokes and flow-formed barrel As of March 2017, you can purchase these new from TireRack for $199 each. Pics on car: Pictures of wheels: Last edited by C4RBON; 03-24-2017 at 12:23 AM. Reason: Clarification

03-25-2017, 06:43 PM	#5
Apoc Senior Member Join Date: Jul 2012 Drives: Raven FR-S 6M Location: Calgary, Canada Posts: 638 Thanks: 348 Thanked 375 Times in 232 Posts Mentioned: 3 Post(s) Tagged: 1 Thread(s)	Kosei K4R 17x8 +36 have been in the Directory for nearly 5 years. There are threads on your exact wheel. Your search foo is not strong http://www.ft86club.com/forums/showthread.php?t=9334 __________________ “The World is Flat” [\|\|•]=(86)=[•\|\|]

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03-23-2017, 09:43 PM	#2
Somerandom18 Senior Member Join Date: Sep 2016 Drives: 2017 manual BRZ Location: USA Posts: 467 Thanks: 322 Thanked 178 Times in 111 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Been wanting these for years! ❤️ NE Ohio represent.

03-23-2017, 09:58 PM	#3
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,334 Thanks: 696 Thanked 2,086 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	That's very light for cast wheel. And at such budget price. Would be nice to see offset at least no less then stock though.

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