will 15's fit? - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 18 (permalink) Old 11-06-2016, 07:34 PM Thread Starter
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will 15's fit?

I would like to get a CONFIRMED/VERIFIED yes or no on a 15" wheel fitting over the rear calipers. If not has anyone found an alternative brake/rotor combination that will accommodate this wheel size other than brembo or carlyle such as camaro 5 v6 or g8 base?
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post #2 of 18 (permalink) Old 11-06-2016, 10:40 PM
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15's will not fit over the stock rear calipers though they can be modified by grinding off something...don't remember what. You have to change to rotor as well as some other stuff. Chase Kirby at Mirror Image (see Facebook) has a kit.

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post #3 of 18 (permalink) Old 11-07-2016, 07:44 AM
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pretty sure if you switch to base g8 calipers and rotors they'll fit inside the wheel, though i believe the control arm needs to be changed.


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post #4 of 18 (permalink) Old 11-07-2016, 06:02 PM Thread Starter
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Originally Posted by DougHG8 View Post
15's will not fit over the stock rear calipers though they can be modified by grinding off something...don't remember what. You have to change to rotor as well as some other stuff. Chase Kirby at Mirror Image (see Facebook) has a kit.
i seen that, pretty pricey.

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Originally Posted by wastedrubber View Post
pretty sure if you switch to base g8 calipers and rotors they'll fit inside the wheel, though i believe the control arm needs to be changed.
looks like ill just have to experiment then. thanks
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post #5 of 18 (permalink) Old 11-07-2016, 10:04 PM
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What's the thoughts behind 15s? Winter tires?
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post #6 of 18 (permalink) Old 11-08-2016, 05:56 AM
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What's the thoughts behind 15s? Winter tires?

Drag racing
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post #7 of 18 (permalink) Old 11-08-2016, 08:15 AM Thread Starter
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What's the thoughts behind 15s? Winter tires?
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Drag racing
exactly
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post #8 of 18 (permalink) Old 11-08-2016, 08:17 AM
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15" mud & snows would be kinda boss for a winter dd tho...
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post #9 of 18 (permalink) Old 11-08-2016, 08:37 AM
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15" mud & snows would be kinda boss for a winter dd tho...
Swap to the winter lift springs too.


LS3 - Livernois 1C cam - Joker ported LSA - Vaporworx - e85 - 2.55 upper / stock lower

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post #10 of 18 (permalink) Old 11-08-2016, 09:11 AM
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Swap to the winter lift springs too.
Or just adjust your coilovers.
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post #11 of 18 (permalink) Old 11-14-2016, 11:00 AM
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i seen that, pretty pricey.



looks like ill just have to experiment then. thanks
Let us know what you find out!
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post #12 of 18 (permalink) Old 11-20-2016, 04:18 PM Thread Starter
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will do
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post #13 of 18 (permalink) Old 01-02-2017, 09:19 AM
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any luck with this ? I am looking to do the same for drag racing ,, although the rules for nhra stock eliminator is a no wider than a 9.0 wide slick ,, so a 8.0-9.0 wide rim would be the widest and don't know how close or interference it would be to the control arm,
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post #14 of 18 (permalink) Old 01-16-2017, 06:34 PM Thread Starter
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control arm will be in the way. I'm not worried about that part as much as i am trying to get a 15" wheel over the brakes
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post #15 of 18 (permalink) Old 04-19-2019, 04:45 PM
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Has anyone made progress on this?
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post #16 of 18 (permalink) Old 04-19-2019, 06:58 PM
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It has been done numerous times. Thing is, very few cars make enough power to justify doing it. Plenty of cars go deep into the 9's on 17's.
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post #17 of 18 (permalink) Old 04-19-2019, 07:06 PM
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It has been done numerous times. Thing is, very few cars make enough power to justify doing it. Plenty of cars go deep into the 9's on 17's.

There is no performance threshold that is required to benefit from the rotational weight savings, added traction, and less price of tires that 15" wheels give you.
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post #18 of 18 (permalink) Old 04-19-2019, 09:11 PM
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Disagree. When you make more power than what a 17" will hold, you go to 15". To do so before that is a poor allocation of resources. The money spent on doing the conversion would more than cover the difference in cost on many sets of tires. The weight difference (even being unsprung and rotational) is negligible.
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