225 on a 7" rim - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-05-2009, 07:01 PM   #1
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Default 225 on a 7" rim

Searched and only got a bunch of bunk results.

Well right now I've got my Kosei K1s which I'm really satisfied with but I feel that the 205s I have on them now are a little narrow. I'm sure someone has run a 225/45/15 on a 7" kosei or something similar, anyone have pics or experiences with them?
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Old 01-05-2009, 07:02 PM   #2
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Running 225-50-15 Yokohama ES100's on motegi 15x6.5" wheels. Yeah, the wheels are ugly, but the tire fits fine IMO.
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Old 01-05-2009, 07:25 PM   #3
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I have Kuhmo 225/50/15's on BBS 15x6.5's for my RX-7. Works pretty good.

Pic for reference.

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Old 01-05-2009, 07:39 PM   #4
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I ran 225/45/15 Hankook RS2s on 6.5" rotas on my Civic with no problems. Hell, I ran 225/45/15 Hoosier Autocross tires on the same size wheels as well.
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Old 01-05-2009, 08:46 PM   #5
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I have 225/55-15 toyo proxxes 4 on some 7" enkeis, I was told 7" is the minimum width for 225 tires, but apparently these newbs (pat excluded) think otherwise. I don't have any real good pictures of the tires, but I'll tell you this: its black and wide and looks like a tire.
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Old 01-05-2009, 08:58 PM   #6
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I'm currently running 225/45/15 RA1's on my 15x7 Volk TE-37's on the track and they are ok. I really need an 8" wheel to square the sidewall, though.
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Old 01-05-2009, 09:12 PM   #7
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Quote:
Originally Posted by curly View Post
I have 225/55-15 toyo proxxes 4 on some 7" enkeis, I was told 7" is the minimum width for 225 tires, but apparently these newbs (pat excluded) think otherwise. I don't have any real good pictures of the tires, but I'll tell you this: its black and wide and looks like a tire.
Lol. We're noobs, but you are stating that 7" is the minimum for 225's because, as you state, 'i was told'.

2 trips to DGRR with my set up on a Mazda far heavier than a Miata, and it handles perfectly.

Who's the 'newb' now!





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Old 01-05-2009, 09:46 PM   #8
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225-50-15's on 6.5" wheels:

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Old 01-05-2009, 10:09 PM   #9
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I've run 225/45/16's on the front 6.5 inch S2000 wheels without any problems. I ordered some 15x7's with 225/45/15 R1R's that should be here any day now. I'll post some pics once they arrive.
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Old 01-05-2009, 11:47 PM   #10
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Sweet deal. Looks like I have more **** to save up for. Feel free to still post pics of your setup.
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Old 01-06-2009, 01:28 AM   #11
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Quote:
Originally Posted by djmtsu View Post
Lol. We're noobs, but you are stating that 7" is the minimum for 225's because, as you state, 'i was told'.

2 trips to DGRR with my set up on a Mazda far heavier than a Miata, and it handles perfectly.

Who's the 'newb' now!
uh, still you.

I should have clarified, I was told through RESEARCH that 7" is the suggested minimum width of wheel to run a 225 width tire. Now as many of you know, you can put a 195 width tire on a 9" rim, and you can even put a 245 width tire on 5.5" rim, basically whatever holds air is supposedly "good to go"

However putting a wider tire on wheel that is narrower than suggested by the tire manufacturers will use all of the sidewall's available flex, thus resulting in the contact patch flexing to get the desired 180 degrees. With a contact patch that isn't flat, you're not getting the full benefit of the wider tire, much like an over inflated tire.

BUT! with only a .5" difference between the suggested width and the 6.5" that you're using, this could probably be solved by lowering your tire pressure by a psi or three. So before I get flamed for my miata.net snobishness, I just wanted to make it clear that I merely voicing my surprise at all the folks with 225 tires on 6.5" wheels, NOT saying that you're all wrong and I'm right, and apologize if my answer came off as so. Pat's wheels do look very nice
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Old 01-06-2009, 01:36 AM   #12
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not a great shot of the car, but its the best I have of my wheel/tire combo
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Old 01-06-2009, 03:10 AM   #13
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i had a similar post on cr.net, im probly going with a 225/50/15 g-force sport on a 15x7 for my daily
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Old 01-06-2009, 09:27 AM   #14
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If I had to do it again though....I would have gone 215's. There is flex in the sidewall, not too bad, but it is there.
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Old 01-22-2009, 06:53 PM   #15
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Got these in a few days ago and thought I'd share:



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Old 01-22-2009, 07:00 PM   #16
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225/45 R1Rs? Let me know how you like them. I was dead-set on getting a set before I traded my 6ULs for the Advans I have.
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Old 01-22-2009, 07:17 PM   #17
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Quote:
Originally Posted by Savington View Post
225/45 R1Rs? Let me know how you like them. I was dead-set on getting a set before I traded my 6ULs for the Advans I have.
I have a friend who turned some very impressive lap times on the 205's...I believe a 1:38 at hallett in an NA 1.6...I'd say thats better than average for a street 1.6 on r-comps...but of course he did it on R1R's.
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Old 01-23-2009, 02:46 AM   #18
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225/45/15 RA1 on a 15x7 Volk TE-37 +43 offset.
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225 on a 7" rim-dsc01185.jpg   225 on a 7" rim-dsc01186.jpg  
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Old 01-23-2009, 10:05 AM   #19
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Quote:
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225/45/15 RA1 on a 15x7 Volk TE-37 +43 offset.
[borat]i like sex.[/borat]
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Old 01-23-2009, 11:04 AM   #20
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Quote:
Originally Posted by Savington View Post
225/45 R1Rs? Let me know how you like them. I was dead-set on getting a set before I traded my 6ULs for the Advans I have.
Yeah. I haven't really gotten an opportunity to play with them too much. They definitely don't like cold weather, but then again I guess no tire does. I'll let you know when I get a better idea of how they perform.
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