17" vs. 18" rims - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Reply
 
 
 
Thread Tools Search this Thread
Old 07-24-2006, 04:43 AM   #1
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Apr 2006
Location: Korea (South)
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Bobtaz13 is on a distinguished road
Default 17" vs. 18" rims

I am currently running 17in rims with 245/50R17 and was thinking of uping to 18in rims with 245/45R18. Has any one had any problem with 18in rims? I am a little scarred of bending them.
Bobtaz13 is offline   Reply With Quote
Old 07-24-2006, 06:23 AM   #2
Junior Member
 
Join Date: Aug 2005
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
wjcollier07 is on a distinguished road
Default

problems...you have to make sure your braking system is REALLY up to snuff number one! remember, the bigger the wheel, the more the brake system has to work to stop that car..

next...your acceleration goes way sluggish

and last but not least...rubbing issues...and yeah i think 18s might rub on the spring seat...

but maybe not!
wjcollier07 is offline   Reply With Quote
Old 07-24-2006, 08:34 AM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Are you asking from a performance standpoint or a looks standpoint? If it'* looks, we'll move this to detailing and appearance.

Accelleration and braking will both be worse, and the sidewall will flex less, having the effect of increasing the 'feel' entering a turn, but decreased traction through the turn. The sidewall needs to flex to maintain the contact patch with the road.

Overall, a negative performance impact and a harsher ride.
willwren is offline   Reply With Quote
Old 07-24-2006, 11:35 PM   #4
Senior Member
Posts like a Turbo
 
Join Date: May 2005
Location: Fredericton, New Brunswick.
Posts: 380
Thanks: 0
Thanked 1 Time in 1 Post
Timothy's Buick is on a distinguished road
Default

I would think that with lower profile tires, like 16-18 inch, would decrease rolling resistance. Imagine pushing a car with fat tires, compared to stiff 16-18 inch tires? Better mileage and better acceleration?

I'd also think braking would feel firmer, and would stop better, because you have wider tires, (more contact with the road?)?

Someone educate me.
Timothy's Buick is offline   Reply With Quote
Old 07-24-2006, 11:54 PM   #5
Junior Member
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default

If you are looking at this from a performance standpoint, don't do it. My friend didn't listen to me and put 18'* on his olds 88 and it rides like my dad'* Durango now.
Bonneville92V688 is offline   Reply With Quote
Old 07-25-2006, 03:08 AM   #6
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Quote:
Originally Posted by Timothy'* Buick
I would think that with lower profile tires, like 16-18 inch, would decrease rolling resistance. Imagine pushing a car with fat tires, compared to stiff 16-18 inch tires? Better mileage and better acceleration?

I'd also think braking would feel firmer, and would stop better, because you have wider tires, (more contact with the road?)?

Someone educate me.
Rolling resistance has nothing to do with wheel diameter, and everything to do with TIRE PRESSURE ONLY.

Rotating MASS is another story. It takes more power to get them moving and to make them stop.
willwren is offline   Reply With Quote
Old 07-27-2006, 03:11 AM   #7
Senior Member
Posts like a Camaro
 
Join Date: Jul 2004
Location: Diberville Mississippi
Posts: 828
Thanks: 0
Thanked 0 Times in 0 Posts
BonnevilleSEman is on a distinguished road
Default

I have 18'* and my car doesn't take any longer to stop or did i notice a loss in acceleration, at least not that i have noticed, Even though more rotating mass does make sense, but does the actual weight of the rims effect anything. Cuz believe it or not my 18'* are lighter than my 16'* (premium wheel package on the se) But i will say this. Keep the 17'* and get some [email protected]$$ tires..LMAO. I really want to go back to my 16'* with a good grippy tire. Also the actually ride was not affected either with the 18'*, but IT DOES STEER INTO POT HOLES WHEN I RUN OVER THEM. I did notice that..lol


James
BonnevilleSEman is offline   Reply With Quote
Old 07-27-2006, 05:03 AM   #8
Member
Posts like a V-Tak
Thread Starter
 
Join Date: Apr 2006
Location: Korea (South)
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Bobtaz13 is on a distinguished road
Default

I am more concerned about bending them. I bent 6 rims when I had 245/45R17 tires on a 17x8 rim. Right now I am running 245/50R17, but they are rare and expensive. But they are the right overall diameter so the transition shifts right and ABS works normal. The 245/45R18 with 18x8 rims are the right size to but like I said I am worried about bending them.
Bobtaz13 is offline   Reply With Quote
Old 07-28-2006, 10:30 AM   #9
Senior Member
Posts like a Northstar
 
Join Date: Jul 2005
Location: Detroit, MI
Posts: 649
Thanks: 0
Thanked 0 Times in 0 Posts
Jason1351 is on a distinguished road
Default

Quote:
Originally Posted by willwren
Accelleration and braking will both be worse, and the sidewall will flex less, having the effect of increasing the 'feel' entering a turn, but decreased traction through the turn. The sidewall needs to flex to maintain the contact patch with the road.

Overall, a negative performance impact and a harsher ride.
Due to personal experiance wren, i get better handling and traction entering, during and leaving a turn with my 18'* over my 16'* and 17'*. With the 16'* the *** of my bonne has broke loose more than a few times when driving along lake the Huron Lake access roads, where it has'nt happened once with the 18'* and only once with the 17'*.
Jason1351 is offline   Reply With Quote
Old 07-28-2006, 11:41 AM   #10
Senior Member
Posts like a Northstar
 
mrbell83's Avatar
 
Join Date: Apr 2006
Location: In the mitten
Posts: 675
Thanks: 0
Thanked 0 Times in 0 Posts
mrbell83 is on a distinguished road
Default

My opinion having owned larger wheels with low profile tires, they handle better on clean dry road, give better cornering, harder ride, and wear quicker. You really don't want side wall tire flex because that gives you body roll and when you are carving corners, you want a wide flat contact patch on the ground. Also the wider the tire and the more agressive the tread the more rolling resistance there is, tire pressure has allot to do with it too, but it you run the tires at the std. pressure then you are going to have more resistance, and that along with the weight will lead to worse fuel economy and depending on how powerful the car is slower acceleration. I know when i added a taller, heavier, wider tire to my truck, my gas mileage went down 2mpg in the city and 3mpg hwy. Also my truck is a stick so I can feel that extra resistance whenever I let the clutch out.This is my experience anyway.
mrbell83 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Rims & Rims PS Rquest -make the 9 spokes black pls. popatim Lounge 5 11-24-2007 07:35 PM
Rear rims compared to Front rims GXP_Vince Detailing & Appearance 8 08-07-2007 04:06 PM
Will 17 inch Bonneville rims work on a GXP with 18 inch rims cballweg Bonneville GXP/ Northstar Powered Cars 5 01-25-2006 12:13 AM
Vote on my rims! Updated...Now-rims on car. Please Vote! Lowrider0308 Your Ride: GM Pictures & Videos 22 11-06-2005 07:24 PM
"new" rims, tires the same? driverjohn2005 General GM Chat 26 03-14-2005 08:00 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:53 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.