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-   MazdaSpeed 3/6 - Wheels & Tires (http://www.mazdaspeedforums.org/forum/f319/)
-   -   Enkei RPF1 18x7.5 5x114.3 48 off set (http://www.mazdaspeedforums.org/forum/f319/enkei-rpf1-18x7-5-5x114-3-48-a-51286/)

Dizzel 03-25-2010 04:56 AM

Quote:

Originally Posted by Arrowpoint (Post 463883)
It's supposed to rain tomorrow so the pics won't be great but I'll go ahead a shoot a few for you. I can tell you that with the 225/45/18 and the 7.5 x 18 48 RPF1's the wheel wells look full. I took a tape measure and measured from the widest point on the tire to the outside edge of the wheel well and the tire is less than 1/2 inch short of being flush at the top. The space between the outside diameter of the tires and the inside edge of the wheel well ranges between 1 inch on the sides to 1 3/4 inches at the top.

Thanks for the info. I'll keep that in mind when comparing prices.

Arrowpoint 03-25-2010 08:43 AM

Crappy flash pics of a dirty car.
 
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I'm ashamed of myself but you wanted them soon!

Dizzel 03-26-2010 03:10 PM

The wheels look great! I hope your happy with them.

Quick question. How often do you carry a full load? At least once a month I carry four adults. In the spring I put the seats down and load it up with mulch. I was just wondering how often people use the utility of the car as opposed to just driving by themselves. I assume this would cause an extra rubbing concern. Unless the inner fender is really concave.

Quote:

You could squeeze 235/40s on the 7.5 rim, but technically it's considered half inch below minimum. To me that's a safety issue so I wouldn't, but a lot of people do.
Is there some sort of guide I could see that would show the "safe" tire sizes in relation to wheel width?

bnoon 03-26-2010 03:23 PM

Quote:

Originally Posted by Dizzel (Post 465737)
Is there some sort of guide I could see that would show the "safe" tire sizes in relation to wheel width?

On tire rack dot com you can click on a tire you like, click on "Specs" and there's a chart that shows recommended wheel widths for that and other sizes as well.

Arrowpoint 03-26-2010 11:43 PM

What I have learned from this thread and looking at the tires and wheels I bought is that wider is possible as long as the wheel diameter is not too large and the offset isn't too much or too little. The set I bought 225/45/18 wihi 48 pffset clears the struts in the front by around 3/4 - 1 inch and about 1 - 1 1/2 inches in the rear. If I had gone with 235/45/18 on wheels with a 48 offset I think I would be very close to touching the struts at least in front. So maybe 50 offset would be in order to move 235/45/18 tires outward a little. Too much outward and because of the 45 aspect ratio you would be risking rubbing on the wheel well so you would need to go to a 40 aspect ratio to reduce the tires diameter. One thing to keep in mind is that at lower speeds wider tires require more streering effort because you are working againt more fricton due to a larger area of tire against the pavement. At higher speeds this effect is reduced. Narrower tires have the opposite effect. they turn easer at low speeds but can be less sticky at High speads due to a smaller surface area against the pavment. I believe that the wheels and tires I got are the widest tires I would consider for my application. I do load it up with two to thee weeks provision and take long road trips in it
So if you plan to go with 235/18 i would advise 40 aspect ratio and a little more than 48 offset. Correct me if I'm wrong I'm just learning this stuff and I took an ambien about a half hour ago.

****I had to edit this after seeing that it made it appear that I bought 235 tires when in reality I bought 225. My bad.

spheed3 03-27-2010 10:48 AM

Hey arrowpoint, how much clearance do you have in the fender well with the wheel at full lock? I have the same wheels on stock suspension looking at getting the same tires but I'm concerned about the larger tires making contact with my Rally Armor mudflaps.

Arrowpoint 03-28-2010 02:17 PM

2 Attachment(s)
Quote:

Originally Posted by spheed3 (Post 467166)
Hey arrowpoint, how much clearance do you have in the fender well with the wheel at full lock? I have the same wheels on stock suspension looking at getting the same tires but I'm concerned about the larger tires making contact with my Rally Armor mudflaps.



I measured on the front left and with the wheel turned left all the way to the stop I have about .5 inches. With the wheel turned right to the stop about 2.5 inches. Keep in mind that there was a typo in my earlier post. These are 225/45/18.

spheed3 03-28-2010 05:11 PM

Thank you, I think they should clear just fine. Time to order some tires :)

Dizzel 03-29-2010 02:24 PM

Thanks for the continued info Arrowpoint. I like how you wheels look and think the smaller size will help control the price.

Can any wheel be fitted with the TPMS or do you need a wheel designed for it?

Arrowpoint 03-29-2010 02:41 PM

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I'm not one hundred percent sure, Dizzel. But I would think so since it's just a valve stem with a transmitter built into it. It doesn't appear that tire rack did anything but install them in place of the regular valve stems.

Dizzel 03-30-2010 11:18 AM

That's what I thought. I really want the Enkei EKM3 in gunmetal but as of right now tire rack is only offering it in bright silver. After all this up sizing excitement I am now being beat down by price. May only increase width to 7.5.

bnoon 03-30-2010 02:44 PM

Quote:

Originally Posted by Arrowpoint (Post 466193)
...with a 48 offset I think I would be very close to touching the struts at least in front. So maybe 50 offset would be in order to move 235/45/18 tires outward a little.


Just to correct you, going from a 48 offset to 50 offset moves the tires/wheels INWARDS, not OUTwards as you stated. There are people running 18x8 50 offset RX8's with 245's on them and not touching the struts, so your 235 statement is wrong all around. Also depends on if the tires used have rim protection beads though too since those stick out more on the sides. Brand of tire and series of tire change things also...

Arrowpoint 03-31-2010 06:05 AM

Re: Enkei RPF1 18x7.5 5x114.3 48 off set
 
Thanks for the correction, Bnoon. When you consider all these variables, I don't know how anyone can know what fits other than a tire tech who has learned by trial and error. It seems like it should be simple but to me anyway its not. It would be cool if someone with access to different tires and wheels could build a photo data base of what fits.

Sent from my SPH-M900 using Tapatalk

Ms3speed 04-12-2010 04:26 AM

18x8 40et
 
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Hey guys I have 18x8 Motegi sp10 wheels with a 40et from what I have been reading It seems like I might have some trouble with lowering it. I am at stock ride height now with 225/40 tires and no problems at all but I have some H&R sport springs that I am dieing to put in but I don't know if I need new wheels or not I was looking at getting some Eneki Ev5s in 18x7.5 45et will I need to roll my fenders still with the 225/40tires? H&R springs are 1.3"f, 1.2"r for the drop -thanks-

jbauer 12-01-2010 09:15 AM

Looks good. Black would have looked better on the MGM, but i'm partial to the black RPF1's since that's what i have. The wife got them as a gift a year or so ago. Love the rims but i do wish they were wider. I may switch to a 17x9 in time.

Still congrats on them though.

dastpe 12-02-2010 05:02 AM

Quote:

Originally Posted by Ms3speed (Post 484013)
Hey guys I have 18x8 Motegi sp10 wheels with a 40et from what I have been reading It seems like I might have some trouble with lowering it. I am at stock ride height now with 225/40 tires and no problems at all but I have some H&R sport springs that I am dieing to put in but I don't know if I need new wheels or not I was looking at getting some Eneki Ev5s in 18x7.5 45et will I need to roll my fenders still with the 225/40tires? H&R springs are 1.3"f, 1.2"r for the drop -thanks-

you will likely need a small roll in the rear. no big deal.

Duk 02-20-2011 11:38 PM

This was a really good read =) Im about to purchase some zr+520 in the same offsets, looks more flush then i thought it would =) !


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