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

DarrenDriven · 05-18-2014, 04:02 PM

As posted in @2poor4LFA's build topic...
http://www.ft86club.com/forums/showthread.php?t=66097

Quote:

Originally Posted by 2poor4LFA

first and most important mod:

light weight wheels: 14lbs!

Kosei 17x7 +50

What a difference it makes!

Stock setup:

Kosei + Michelin PSS (225/45/17):

5 pound difference per corner!
20 pounds shed total which equates to roughly 400lbs shed of the car!

G_Rossney · 01-22-2015, 01:24 PM

Do you know the bore on the K4R? I have these and the hub rings that Tire Rack provided are plastic. I want to find better rings. I know the FR-S is 56.1mm. I can't find the data anywhere!

fatoni · 01-22-2015, 01:54 PM

Definitely doesn't equate to 400lbs but I like those wheels

travisb · 03-15-2015, 11:07 PM

I just installed my Kosei K4R 17x7.0 and 215/45R-17 Dunlop Direzza ZII Star Specs.

The light-weight wheels are immediately noticeable and these tires grip fantastically.

Pat · 03-15-2015, 11:29 PM

Looks great. Can I ask why you went with the narrower version?

travisb · 03-16-2015, 07:12 AM

Thanks. I bought this tire/wheel combo primarily for autocross.

To stay in street (stock) class you need to keep the same wheel diameter and width as stock within a 6mm offset. This means 17x7 with an offset between +42 and +54.

These are the lightest wheels that I liked that fit my budget. They feel great and honestly I could feel a difference even before I left the driveway.

tk1138 · 03-11-2016, 10:30 PM

Quote:

Originally Posted by G_Rossney

Do you know the bore on the K4R? I have these and the hub rings that Tire Rack provided are plastic. I want to find better rings. I know the FR-S is 56.1mm. I can't find the data anywhere!

The rings that Tirerack ships with them say 73.0mm, but 73.1 would be the more common size. I haven't tried rings other than the ones TR sent with them though.
Mine show 5x114.3 stamped near the rim, but it looks like the spacing is 5x100 and the sticker shows 5x100. Maybe they use the same cast and drill them out differently depending on the needed pattern.

zigzagz94 · 03-11-2016, 11:45 PM

Quote:

Originally Posted by tk1138

The rings that Tirerack ships with them say 73.0mm, but 73.1 would be the more common size. I haven't tried rings other than the ones TR sent with them though.
Mine show 5x114.3 stamped near the rim, but it looks like the spacing is 5x100 and the sticker shows 5x100. Maybe they use the same cast and drill them out differently depending on the needed pattern.

Just got my Kosei K4R 17x7 +50 with 225/45/17 MPSS from Tire Rack and they're also stamped 5x114.3

I think everyone I've seen has been stamped that way and you're probably right about them using the same mold and just drilling them differently depending on the pattern needed.

Timmy_Jones · 03-12-2016, 10:23 AM

Quote:

Originally Posted by travisb

These are the lightest wheels that I liked that fit my budget. They feel great and honestly I could feel a difference even before I left the driveway.

Before you left your driveway? They handled better in your driveway? Is your driveway a mile long? I don't follow.

01-22-2015, 01:54 PM	#3
fatoni Senior Member Join Date: Apr 2011 Drives: miata, mazdaspeed protege, ls430 Location: socal Posts: 4,416 Thanks: 599 Thanked 1,442 Times in 787 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	Definitely doesn't equate to 400lbs but I like those wheels __________________ Drive upgrades. Don't buy them.

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01-22-2015, 01:24 PM	#2
G_Rossney Member Join Date: Apr 2013 Drives: 2013 BRZ, Limited, 6spd MT, GBS Location: Gardean, CA Posts: 63 Thanks: 7 Thanked 10 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Do you know the bore on the K4R? I have these and the hub rings that Tire Rack provided are plastic. I want to find better rings. I know the FR-S is 56.1mm. I can't find the data anywhere!

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