275-40 R18 tires on C6 18x8.5 wheels?
08-09-2014, 08:39 PM
#1
Member
Thread Starter
iTrader: (1)
Join Date: May 2010
Location: Chickamauga, GA
Posts: 426
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
275-40 R18 tires on C6 18x8.5 wheels?
So I picked up two practically brand new Goodyear Eagle F1 run flats, both are 275-40 R18.... I know the recommended wheel width for a 275 is 9", but an 8.5 is not far off. Having said that, would it be an issue to run these? I've heard of mustang owners running this size on 8.5" wheel.
Looking for some opinions... I have 285-35 R19's for the rear already.
Thanks
Looking for some opinions... I have 285-35 R19's for the rear already.
Thanks
08-09-2014, 09:49 PM
#2
Supreme Member
Join Date: Jul 1999
Location: Ahead of you...
Posts: 2,752
Likes: 0
Received 6 Likes
on
5 Posts
Car: 1984 LG4 Camaro
Engine: 350 Roller Motor
Transmission: Level 10 700R4
Axle/Gears: Strange 12 bolt 3.42
Re: 275-40 R18 tires on C6 18x8.5 wheels?
Actually I would only go with a 9.5" or 10" wide wheel with a 275 width tire. Otherwise you will negatively affect the contact patch, steering feel, and stability at speed.
I would recommend going with a 255-40/45 tire for your car with the 8.5" wheel you want to run.
I would recommend going with a 255-40/45 tire for your car with the 8.5" wheel you want to run.
08-18-2014, 09:03 AM
#3
Supreme Member
Join Date: Apr 2013
Location: North Salt Lake
Posts: 1,353
Likes: 0
Received 1 Like
on
1 Post
Car: '86 Camaro, '94 Camaro, 3 others
Engine: LG4 ->L29, L32->LR4, L36, LG4, L31
Transmission: 700R-4, T5WC, 4L80E, SM465, 4L60E
Axle/Gears: 3.42, 3.23, WTB/WTT 2.93
Re: 275-40 R18 tires on C6 18x8.5 wheels?
As noted, it won't perform well, but for A-to-B, it can be done safely enough. Why not get 9.5s for the front? It is an easy fit.
08-18-2014, 09:16 AM
#4
Member
Thread Starter
iTrader: (1)
Join Date: May 2010
Location: Chickamauga, GA
Posts: 426
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
The reason I haven't considered 9.5 wheels is I already have these OEM C6 wheels. I had the tires mounted, not as bad as I expected... actually they will be fine for now until the new motor gets broken in. After these wear out I'll install the factory size tire, before I do any spirited driving or long road trips.
09-02-2014, 02:42 AM
#5
Member
iTrader: (2)
Join Date: Jul 2012
Location: Lincoln, NE
Posts: 174
Likes: 0
Received 1 Like
on
1 Post
Car: 1985 Trans Am
Engine: 385
Transmission: 700R4
Axle/Gears: 10 Bolt 4.10
Re: 275-40 R18 tires on C6 18x8.5 wheels?
I've run 275/35/18s on 8.5 C6 wheels, and they performed fine. Is a 255 a better fit? Definitely, but it doesn't make as big of a difference as everyone makes it sound on here. I stepped down to some 265s and couldn't tell any bit of difference what so ever.
Thread
Thread Starter
Forum
Replies
Last Post