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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Thu, Aug-01-2019, 06:50:10 PM   #1
JerseyDriver820
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Default 17 inch rims worth it?

Hello all. I currently run a 255/35/18 tire at the track with apex arc-8's. Still on stock brakes, for now. I recently came across an opprotunity to buy at a very cheap price 17x9.5 et 42 (I believe) arc-8's. I was curious if going to a smaller rims helps any. I know my unsprung weight will be effected but will anything else? I'd rather not dish out the money if the differences are negligible.

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Old Thu, Aug-01-2019, 06:53:21 PM   #2
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Default Re: 17 inch rims worth it?

The difference will be negligible. The cost saving will not be. Main reason is for cheap tires.
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Old Thu, Aug-01-2019, 08:21:04 PM   #3
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Default Re: 17 inch rims worth it?

Only reason I didn't go 17 inch is most BBKs won't fit on 17s. The tire choices and prices are much better on 17s.
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Old Fri, Aug-02-2019, 04:10:49 AM   #4
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Default Re: 17 inch rims worth it?

Quote:
Originally Posted by Sandeep1212 View Post
The difference will be negligible. The cost saving will not be. Main reason is for cheap tires.
WHS, the weight savings in rims will be offset by the heavier tires. Not to mention 17x9 et42 will most likely require spacers too.

With 17s you get that "rollover" effect due to higher sidewalls. On the other hand, assuming overall diameter with 17" is smaller, you'll get the gearing benefit.

Net, I think 18's are more beneficial but the cost savings with 17s is pretty significant.
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Old Fri, Aug-02-2019, 04:59:47 AM   #5
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Default Re: 17 inch rims worth it?

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Originally Posted by Dji203 View Post
WHS, the weight savings in rims will be offset by the heavier tires. Not to mention 17x9 et42 will most likely require spacers too.

With 17s you get that "rollover" effect due to higher sidewalls. On the other hand, assuming overall diameter with 17" is smaller, you'll get the gearing benefit.

Net, I think 18's are more beneficial but the cost savings with 17s is pretty significant.
I did comparisons for apex rims and average tire weights across different brands, and the tires are heavier.... but not enough to cancel out the rim's weight loss. Overall, 17's are still lighter.

17x10 wheels can still fit lots of BBKs, and 17x9.5 can fit a handful with spacers
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Old Fri, Aug-02-2019, 02:50:29 PM   #6
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Default Re: 17 inch rims worth it?

17x10. 5's with RC-1s in 275/35/17 for the WIN. Shorter sidewalls, less weight, better gearing, cheap, long life, PLENTY grippy enough for HPDE or practice.
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Old Fri, Aug-02-2019, 07:44:42 PM   #7
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Default Re: 17 inch rims worth it?

I'm running 17s for track. The increased weight from the tires is less than the decreased weight from the wheels, and even more so when you factor in rotational inertia.

They (10" et25 ARC8s) clear my brake (brembo 355s) without issue.

New tires are cheaper...

however...

Takeoffs almost don't exist (vs pretty easy to buy for 18s, lots local to me) and tire selection is far more limited.

I somewhat regret going from 18" to 17". If I see a set of RS110s on sale, I'll probably buy them.
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Old Fri, Aug-02-2019, 08:46:31 PM   #8
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Default Re: 17 inch rims worth it?

Thanks you all for the comments. I love the look of my 18's and the tire price is not enough to justify the change over

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Old Sat, Aug-03-2019, 05:05:39 AM   #9
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Default Re: 17 inch rims worth it?

Quote:
Originally Posted by Drewster View Post
I did comparisons for apex rims and average tire weights across different brands, and the tires are heavier.... but not enough to cancel out the rim's weight loss. Overall, 17's are still lighter.

17x10 wheels can still fit lots of BBKs, and 17x9.5 can fit a handful with spacers
If you keep it apples to apples (width and offset), the weight savings is mostly negated. OP said he’s looking at Apex 17x9 et42. The ARC 8’s in that width/offset weighs 17.8lbs whereas the 18x9 et42 weighs 18.7lbs. Weight savings of ~1lb.

Stepping down from 255/35-18 to 255/40-17 generally results in +1lb increase (~25lbs to ~26lbs).


Quote:
Originally Posted by Obioban View Post
I'm running 17s for track. The increased weight from the tires is less than the decreased weight from the wheels, and even more so when you factor in rotational inertia.
Agree on the rotational mass and for everyday driving this is probably more relevant but on a road course I never noticed a difference.
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