Larger 18" tires. What experience do you have? - Mazda CX3 Forum
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post #1 of 35 Old 08-29-2017, 01:32 PM Thread Starter
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Question Larger 18" tires. What experience do you have?

I have a set of 18x8" wheels on order, Konig Oversteer, so I am going to be getting wider tires soon.

Stock is 215/50/18 which are around 26.5'" so my choices are 235/45/18 which are 26.3" ore 245/45/18 which are 26.7." What have you guys tried? I know a lot of people have when with the 235, but the 245 will fill the fenders out more. I also think that they will clear fine with a 45mm offset 8" wheel. The 235s are 9.3" in section with and the 245s are 9.5" I believe. Not much difference.

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post #2 of 35 Old 08-29-2017, 06:36 PM
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235/45/18 is closer to the OE diameter than 245/45/18. Use that calculator I linked in your other thread to see the difference.

245/45/18 will bulge more on an 8" wide wheel. I like a square sidewall to a wheel (with little bulge or stretch). A 245/45/18 should be on a 9" wide wheel (probably will not fit on CX-3 unless it's a custom offset wheel which means major $$$$$$$)

An 18x8" wheel is not as proportional as a 17x8" wheel (what I run on my CX-3). To elaborate a bit, a 17x8" wheel gives a more "wide stance" look than a 18x8" wheel. JMO.

Nice choice on the wheel BTW, you've seen my setup I use the same wheel just 1" smaller diameter.

Tony

Post up pics when you get your Oversteers installed. I would like to see how your 18" Oversteers look compared to mine.
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post #3 of 35 Old 08-29-2017, 08:30 PM
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If you want to see what a 245/45 tire looks like on an 8" wide wheel here is a video I did when I put a 245/45/17 on my SX4.

There is a bulge but not bad really as a 245/45 tire really looks good on a 9" wide wheel. I used 245/45/17 on the Suzuki because it is exactly the same circumference as the OE 205/60/16 that it comes with.

Skip to around the 4:00 minute mark of the video to see the tires up close.

https://www.youtube.com/watch?v=_mwHddP748E
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post #4 of 35 Old 08-30-2017, 12:10 AM
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Im running the factory Mazda6 19" wheels with new 225/45 which are 26.97" tall and 8.86" wide and lowered on corksport springs with spacers flush with fenders. Fills the wheel wells perfectly no rubbing.
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post #5 of 35 Old 08-30-2017, 02:44 PM Thread Starter
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Quote:
Originally Posted by GriffCx3 View Post
Im running the factory Mazda6 19" wheels with new 225/45 which are 26.97" tall and 8.86" wide and lowered on corksport springs with spacers flush with fenders. Fills the wheel wells perfectly no rubbing.
That looks great.

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post #6 of 35 Old 08-30-2017, 02:53 PM Thread Starter
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Wink

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Originally Posted by Cman View Post
235/45/18 is closer to the OE diameter than 245/45/18. Use that calculator I linked in your other thread to see the difference.

245/45/18 will bulge more on an 8" wide wheel. I like a square sidewall to a wheel (with little bulge or stretch). A 245/45/18 should be on a 9" wide wheel (probably will not fit on CX-3 unless it's a custom offset wheel which means major $$$$$$$)

An 18x8" wheel is not as proportional as a 17x8" wheel (what I run on my CX-3). To elaborate a bit, a 17x8" wheel gives a more "wide stance" look than a 18x8" wheel. JMO.

Nice choice on the wheel BTW, you've seen my setup I use the same wheel just 1" smaller diameter.

Tony

Post up pics when you get your Oversteers installed. I would like to see how your 18" Oversteers look compared to mine.
Actually, for both the 235 and the 245 an 8" wheel is the measuring rim with used in their specs. I agree that 9" would be optimal for a 245, but 8" is fine although there might be a little more bulge. Nissan uses the 245/45/18 on Maxima's and there are some Infiniti's that use that size as well, all on an 8" wheel. As far as the speedo being off, the 235 and the 245 have a similar error, it is just that one is faster than stock and one is slower. The overall circumference is similar between both sizes compared to stock; the 235 is a little shorter and 245 is a little taller. My biggest concern is clearance next to the strut. Although your 235s are narrower than a 245, they are on a 17" wheel, so you encounter more sidewall flex than an 18" tire/wheel combo. How is the clearance between the strut and your tires? You are using similar wheel specs to me except for the diameter, so I am curious as to your clearance. I do have Mazda specific 5mm JBR spacers from my Mazdaspeed I can use if need be. I am going to do some measuring this weekend. If I can fit a 245, I am going to go for it.

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post #7 of 35 Old 08-30-2017, 02:58 PM Thread Starter
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235/45-18 245/45-18 Difference
Diameter inches (mm) 26.33 (668.7) 26.68 (677.7) 0.35 (9) 1.3%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 82.71 (2100.78) 83.82 (2129.06) 1.11 (28.27) 1.3%
Sidewall Height inches (mm) 4.16 (105.75) 4.34 (110.25) 0.18 (4.5) 4.3%
Revolutions per mile (km) 766.07 (476.01) 755.9 (469.69) -10.17 (-6.32) -1.3%

215/50-18
Diameter inches (mm) 26.46 (672.2)
Width inches (mm) 8.46 (215)
Circum. inches (mm) 83.14 (2111.78)
Sidewall Height inches (mm) 4.23 (107.5)
Revolutions per mile (km) 762.08 (473.53)

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post #8 of 35 Old 08-30-2017, 03:24 PM Thread Starter
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I really want to thank everyone for their input. It really means a lot.

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post #9 of 35 Old 08-30-2017, 04:30 PM Thread Starter
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Discount Tire as always is amazing. Ordered on Monday and got them on Tuesday right to my door. Great discounts for Labor Day right now too!
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post #10 of 35 Old 09-03-2017, 11:39 AM
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It's too bad most of these afkt wheels don't come in half width sizes (17x7.5" is popular that I can see).

TBH, I would like to see a 245/45 tire on a 8.5" wide wheel. Most tires that size list approved rim widths as between 7.5" to 9" wide. I like to be in the middle of those recommended widths. Mounting a tire in the middle of the approved width range will give you a nice square sidewall................MOST times.

Different makes of tires in the same size will also have different measurements so take that into account when you choose your size. In most cases Michelin tires are almost always wider in size than the tire listing, B/stone Firestone are usually bang on and BFG & Nitto are usually narrower for the tire size.

Basically you saw my video above for my 245/45 Indy 500 tires? If I decided to instead get Michelin Pilot Sport tires in the same size mounted on that 8" wide wheel it would bulge and wouldn't look as good as the Firestone tire I have on that wheel. The Michelins in this case would be perfect on a 9" wide wheel.
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