Kosei K1 Racing Versus New Kosei K5R

Are you looking for a strong, lightweight wheel for autocross events? In the past, you would look no further than the Kosei K1 Racing wheel. Designed for track use, the Kosei K1 Racing meets many of the demands of the weekend warrior racer. Whether you are a driver participating in HPDE track days, driving schools or even just autocrossing, the Kosei K1 Racing is both light, durable and an outstanding value for the price. All good things eventually come to an end, and the production of the Kosei K1 Racing wheel is no exception. There are still a few sizes of the K1 Racing still in production, but many sizes have been phased out. 

Fortunately, Kosei designed a worthy successor to the popular K1 Racing with the new Kosei K5R. Just like its predecessor, the new K5R is lightweight, attractive and its flow formed construction should be just as durable as the K1 Racing. The new Kosei K5R is available for many popular 15x7, 15x8, 17x7, 17x8 and 17x9 applications, as well as offered in two different finishes.

 Kosei K5R Silver
Kosei K5R Silver Painted
 Kosei K5R Light Grey
Kosei K5R Light Grey Painted

Both finishes look great, but if you have a race application or a vehicle that tends to put off a lot of brake dust, you may want to lean towards the light grey painted finish, as the color is a bit darker to help hide the brake dust.  

While both the K1 Racing and K5R are popular as track wheels, they also make great street wheels for many drivers. In fact, I used the Kosei K1 Racing wheel on my Mazda Miata almost exclusively as a street wheel. You can read about about my experience with the wheel by taking a look at "Kosei K1 Racing Wheels for Mazda Miata."  

Just keep in mind that K5R wheels do not come with a cosmetic center cap as they are not needed for racing or fair weather street use. If you'd like a center cap for cosmetic reasons or for all-season driving, an optional center cap is available for most applications.

Shop by vehicle to check for pricing and availability.  


Wednesday, September 16, 2015 by Erik

Hi, I was wondering if you had optional caps available for the 17x9 Kosei wheels?


Thursday, September 17, 2015 by Gary


I can check, What model of Kosie wheel is it? If you aren't sure, we'll need the complete list of part #s stamped on the back of the wheel.
Thursday, December 3, 2015 by Nick

Do they make a 17x9 K5R in a 5x120 bolt pattern?

Thursday, December 3, 2015 by Gary


I can check on this for you. What is the year and model of vehicle in question? Or if you can supply the center bore and offset I can check that way as well.
Friday, December 4, 2015 by Nick

5 Series E60/61 = PCD 5x120 center bore 72.5mm and M12x1.5 bolt thread. ET 15-32

The Kosei K5R would be either +40, +42, +45 I would assume
Friday, December 4, 2015 by Gary


Due to differences in brake clearances, I'll need to know the year and model of E60/E61. For example is this a 2004 530i?
Friday, December 4, 2015 by Gary


The only 17X9 K5R we can get in 5x120 would be ET45. Without some sort of spacer this may not clear the suspension on most 2004 5 series cars.
Monday, January 25, 2016 by Joey

Regarding center caps for Kosei K5R, do you have any that will fit the 17x7 4x108 filament for the Fiesta ST? Can be from a different manufacturer if available.
Tuesday, January 26, 2016 by Gary


We know of no center caps that fit this application, sorry.
Friday, December 2, 2016 by Salvador De Lira

Hi I was wondering if you guys had any kosei k5 available in stock 15x7 4x100 my make and model is a 1996 civic dx thanks.
Thursday, April 12, 2018 by Gary

Currently using K4R 15x7 ET40 on 2013 stock MINI Cooper with 5mm spacers in rear to clear trailing arm--these wheels are NLA. Will the same size K5R fit, and would spacers be needed in front and/or rear? What is the weight (my 4Rs are 10.4#)? These are for the track. Not using studs so can't go to the RPF1s in this size.

Monday, April 16, 2018 by Tire Rack Team

Gary, we do not show the K5R as a fitment for your 2013 Mini Cooper but there is one in 15X7 4-100 ET40, just like your current ones, so what you did to get the K4R to fit should be the same for this. It weighs 11.8 lbs.

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