Kosei K1's for M Coupe?

bmwtmx · 11-24-2010, 08:05 AM

Has anyone tried the Kosei K1's in 17 x 8.5 for the M Coupe? Tire Rack says they will fit and they are really light, inexpensive, and would be quicker on the track than larger diameter wheels....I used these exclusively when I raced my E30 M3 and never had a problem but wanted to see if they fit without issue on the M Coupe.

O-cha · 11-24-2010, 08:24 AM

They fit, you'll need spacers if you want to keep your track width in the rear, otherwise they will be super sunk in.

I tracked them for a long time before I got a BBK, love them.

3002 tii · 11-24-2010, 08:29 AM

what o-cha said, they unfortunately don't make them in the aggeressive offset you need for the reas so you'll have to slap on spacers.

bmwtmx · 11-24-2010, 08:43 AM

Any idea what size spacers? These will only be for the track. Just so many more tires to choose from in 17's and they are 2/3 the price of 18's. Plus, little faster out of the hole.

krnnerdboy · 11-24-2010, 08:46 AM

theyre a 17x8.5 et 40 I believe. you could use up to a 30 in the rear and a 15 in front depending on how aggressive you want it

bmwtmx · 11-24-2010, 08:56 AM

Do you need longer wheel bolts?

dorifto88 · 11-24-2010, 11:49 AM

Yes with a 30mm you do.

schwank · 11-24-2010, 12:47 PM

What tire size do you guys use? I was looking at this option too.

dorifto88 · 11-24-2010, 02:30 PM

Quote:

Originally Posted by schwank

What tire size do you guys use? I was looking at this option too.

extended studs?
supposedly with 15mm spacers a 75 stud should be sufficient... larger spacers should use either an 80 or 90mm stud

ZStig · 11-24-2010, 04:16 PM

pics on car?

Z4-VILLA · 12-14-2010, 04:27 AM

+1

schwank · 12-31-2010, 10:01 AM

What tire size do you guys run on these K1's?

O-cha · 12-31-2010, 11:57 AM

Quote:

Originally Posted by dorifto88

extended studs?
supposedly with 15mm spacers a 75 stud should be sufficient... larger spacers should use either an 80 or 90mm stud

It depends. I was able to use a 15mm spacer on a 75mm stud, the best thing is to check on your application how many turns you get. IIRC 8 threads is what you need.

Quote:

Originally Posted by schwank

What tire size do you guys run on these K1's?

I ran 255s.

idlook2 · 04-20-2011, 09:19 PM

just bought a z4 3.0si coupe and have Kosei K1's from my E46 that I plan on using as my winter set for the Z4. It's going to look pretty funny in the rear without spacers. Im going to pop the wheels on for test fitment soon. I'll try to remember to take a picture and post it here.

11-24-2010, 08:05 AM	#1
bmwtmx Second Lieutenant 111 Rep 202 Posts Drives: 2008 BMW M3 Join Date: Aug 2010 Location: Florida iTrader: (0)	Kosei K1's for M Coupe? Has anyone tried the Kosei K1's in 17 x 8.5 for the M Coupe? Tire Rack says they will fit and they are really light, inexpensive, and would be quicker on the track than larger diameter wheels....I used these exclusively when I raced my E30 M3 and never had a problem but wanted to see if they fit without issue on the M Coupe.
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11-24-2010, 08:24 AM	#2
O-cha Brigadier General 218 Rep 4,726 Posts Drives: Mcoupe Join Date: Oct 2007 Location: In front of you iTrader: (2)	They fit, you'll need spacers if you want to keep your track width in the rear, otherwise they will be super sunk in. I tracked them for a long time before I got a BBK, love them. __________________
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11-24-2010, 08:29 AM	#3
3002 tii Lieutenant General 2286 Rep 12,565 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (99) Garage List F15 X5 xDrive35i [8.75] E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.24]	what o-cha said, they unfortunately don't make them in the aggeressive offset you need for the reas so you'll have to slap on spacers. __________________ Follow for latest mods
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11-24-2010, 08:43 AM	#4
bmwtmx Second Lieutenant 111 Rep 202 Posts Drives: 2008 BMW M3 Join Date: Aug 2010 Location: Florida iTrader: (0)	Any idea what size spacers? These will only be for the track. Just so many more tires to choose from in 17's and they are 2/3 the price of 18's. Plus, little faster out of the hole.
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11-24-2010, 08:46 AM	#5
krnnerdboy Colonel 190 Rep 2,431 Posts Drives: v10 m6 Join Date: Nov 2008 Location: so cal iTrader: (10)	theyre a 17x8.5 et 40 I believe. you could use up to a 30 in the rear and a 15 in front depending on how aggressive you want it __________________ F80 m3, 997 gt3, 14 ram ctd, f15 x5, drz400sm Gone:z4m, boss 302, c6 z06, m6,z3m
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11-24-2010, 08:56 AM	#6
bmwtmx Second Lieutenant 111 Rep 202 Posts Drives: 2008 BMW M3 Join Date: Aug 2010 Location: Florida iTrader: (0)	Do you need longer wheel bolts?
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11-24-2010, 11:49 AM	#7
dorifto88 Major 49 Rep 1,135 Posts Drives: 88 Nissan Pathfinder Join Date: May 2010 Location: cowtown iTrader: (4)	Yes with a 30mm you do.
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11-24-2010, 12:47 PM	#8
schwank First Lieutenant 30 Rep 317 Posts Drives: 06 z4 m coupe Join Date: Nov 2006 Location: cincinnati iTrader: (0)	What tire size do you guys use? I was looking at this option too.
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11-24-2010, 04:16 PM	#10
ZStig instagram 997turbotom 279 Rep 7,377 Posts Drives: Interlagos Z4MR Join Date: Jun 2008 Location: Delray Beach, FL iTrader: (4)	pics on car? __________________
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12-14-2010, 04:27 AM	#11
Z4-VILLA Banned 111 Rep 2,460 Posts Drives: Z4M Hardtop Roadster Join Date: Feb 2009 Location: Classified iTrader: (0)	+1
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12-31-2010, 10:01 AM	#12
schwank First Lieutenant 30 Rep 317 Posts Drives: 06 z4 m coupe Join Date: Nov 2006 Location: cincinnati iTrader: (0)	What tire size do you guys run on these K1's?
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04-20-2011, 09:19 PM	#14
idlook2 Enlisted Member 0 Rep 46 Posts Drives: 89' 325is x2 Join Date: Apr 2011 Location: Chicago iTrader: (0)	just bought a z4 3.0si coupe and have Kosei K1's from my E46 that I plan on using as my winter set for the Z4. It's going to look pretty funny in the rear without spacers. Im going to pop the wheels on for test fitment soon. I'll try to remember to take a picture and post it here.
	Appreciate 0 Quote