I want to order some 18" coys... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

INSIDIOUS '86 · 02-11-2014, 03:32 PM

So like the title states. I want to put on some 18" coys for my truck. Naturally I want the widest fattest tires a can. I've been searching and found 5" backspace for the back and 4.5 for the front is pretty common. Is this the absolute max before scrub line issues?
Also there's a lot of typos on the coys wheel site so I'm taking everything on there with a grain of salt. Would like to try some 255s up front and 275s in rear
I'm currently 6-8 drop but plan to go lower still with modular spindles up front and a pancaked crossmember with 1"taller lower ball joints. Should be good for 7-9 haha

Jonboy · 02-11-2014, 04:36 PM

With the newer fenders, you might be asking for trouble going that low in the front without mods to or losing the inners.

cory d · 02-11-2014, 05:12 PM

taller lower ball joint. i should look into that, increase camber gain when cornering and doesnt really drop the roll center. not t mention a little bit of drop all on top of that. neato. you can jam 275's in the front with the wheels just into the wheel well. might as well do 295 on the rear. but i dont know what they have for 18. oh fleetsides have bolts that can rub on the tire huh. carriage bolts and a panhard......and 305. hmmmmmmm

you have these guys? pretty shnazzy http://www.summitracing.com/parts/ha...ckup/year/1974

cory d · 02-11-2014, 06:00 PM

Quote:

Originally Posted by cory d

taller lower ball joint. i should look into that, increase camber gain when cornering and doesnt really drop the roll center. not t mention a little bit of drop all on top of that. neato. you can jam 275's in the front with the wheels just into the wheel well. might as well do 295 on the rear. but i dont know what they have for 18. oh fleetsides have bolts that can rub on the tire huh. carriage bolts and a panhard......and 305. hmmmmmmm

you have these guys? pretty shnazzy http://www.summitracing.com/parts/ha...ckup/year/1974

re-re-re-re-re-edit: didnt find some that already had a .5" taller ball joint. so thats $80 for 2 ball joints and $40 for 2 +.5" studs. yikes. but i probably dont need to replace the uppers. i wouldn't think they would wear as fast

INSIDIOUS '86 · 02-11-2014, 11:33 PM

Quote:

Originally Posted by Jonboy

With the newer fenders, you might be asking for trouble going that low in the front without mods to or losing the inners.

I'm planning on raising the inner fenders for this. Or just grin and bear it haha.

muthstryker · 02-12-2014, 02:40 AM

I have some 22s you can buy!! Haha I'm having trouble not buying new 20s right now, your truck will look awesome with the 18" Coys

INSIDIOUS '86 · 02-12-2014, 12:50 PM

Quote:

Originally Posted by muthstryker

I have some 22s you can buy!! Haha I'm having trouble not buying new 20s right now, your truck will look awesome with the 18" Coys

I hope so! Check out the NW c10s on Facebook. Simone there will more than likely enjoy your 20s

c-man405 · 02-12-2014, 02:56 PM

just curious. i might have missed is but what coys are you looking at??

INSIDIOUS '86 · 02-12-2014, 04:37 PM

Quote:

Originally Posted by c-man405

just curious. i might have missed is but what coys are you looking at??

I was looking at their c5s

kevinr1970 · 02-12-2014, 07:06 PM

What is the story with your 22's?

Quote:

Originally Posted by muthstryker

I have some 22s you can buy!! Haha I'm having trouble not buying new 20s right now, your truck will look awesome with the 18" Coys

kevinr1970 · 02-12-2014, 07:07 PM

..

INSIDIOUS '86 · 02-12-2014, 07:37 PM

Quote:

Originally Posted by kevinr1970

What is the story with your 22's?

I met him the other day. He just doesn't like them on the truck.

muthstryker · 02-12-2014, 08:03 PM

How tall of a tire are you wanting? Most 295-305 tires for 18s are under 26 inches tall.

INSIDIOUS '86 · 02-12-2014, 08:56 PM

Quote:

Originally Posted by muthstryker

How tall of a tire are you wanting? Most 295-305 tires for 18s are under 26 inches tall.

Well I'm going to order some bfg g force sport comp IIs mine are about 26.5 right now and I would end up with 25.5 tall with the new setup. So not a huge difference.

muthstryker · 02-12-2014, 10:23 PM

That'd be cool, have you seen the Nitto INVOs? Amazing tire and they have the perfect sizes
255/40/18 front and 295/35/18 rear. 26 inches tall front and rear. When you get your 18s id love to stop by and check it out, ive never seen 18s in person and im torn between 18 and 20s right now

INSIDIOUS '86 · 02-12-2014, 10:27 PM

Quote:

Originally Posted by muthstryker

That'd be cool, have you seen the Nitto INVOs? Amazing tire and they have the perfect sizes
255/40/18 front and 295/35/18 rear. 26 inches tall front and rear. When you get your 18s id love to stop by and check it out, ive never seen 18s in person and im torn between 18 and 20s right now

That's why I can't wait till my returns come in. It will be all spent in less than two minutes haha
As for nitto tires I'm sure they are great tires but I much prefer American made tires for my US made truck.

muthstryker · 02-12-2014, 10:57 PM

Ive been staring at my return for the last week lol

cory d · 02-12-2014, 11:00 PM

25.5" tall tire and 3.37s. oooou we. TIME FOR OVERDRIVE

INSIDIOUS '86 · 02-13-2014, 03:48 AM

Quote:

Originally Posted by cory d

25.5" tall tire and 3.37s. oooou we. TIME FOR OVERDRIVE

M22w with gear vendors...mmm sounds so sweet

cory d · 02-13-2014, 03:54 AM

chuch-ing

02-11-2014, 03:32 PM	#1
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	I want to order some 18" coys... So like the title states. I want to put on some 18" coys for my truck. Naturally I want the widest fattest tires a can. I've been searching and found 5" backspace for the back and 4.5 for the front is pretty common. Is this the absolute max before scrub line issues? Also there's a lot of typos on the coys wheel site so I'm taking everything on there with a grain of salt. Would like to try some 255s up front and 275s in rear I'm currently 6-8 drop but plan to go lower still with modular spindles up front and a pancaked crossmember with 1"taller lower ball joints. Should be good for 7-9 haha __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

02-11-2014, 04:36 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: I want to order some 18" coys... With the newer fenders, you might be asking for trouble going that low in the front without mods to or losing the inners. __________________ 1974 Jimmy- 5.3/4L80e/NP241

02-11-2014, 05:12 PM	#3
cory d Registered User Join Date: Dec 2011 Location: Arlington WA Posts: 1,728	Re: I want to order some 18" coys... taller lower ball joint. i should look into that, increase camber gain when cornering and doesnt really drop the roll center. not t mention a little bit of drop all on top of that. neato. you can jam 275's in the front with the wheels just into the wheel well. might as well do 295 on the rear. but i dont know what they have for 18. oh fleetsides have bolts that can rub on the tire huh. carriage bolts and a panhard......and 305. hmmmmmmm you have these guys? pretty shnazzy http://www.summitracing.com/parts/ha...ckup/year/1974 __________________ GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread Last edited by cory d; 02-11-2014 at 05:22 PM.

02-12-2014, 02:40 AM	#6
muthstryker Registered User Join Date: Dec 2009 Location: Snohomish, Washington Posts: 1,187	Re: I want to order some 18" coys... I have some 22s you can buy!! Haha I'm having trouble *not* buying new 20s right now, your truck will look awesome with the 18" Coys __________________ Matt

02-12-2014, 02:56 PM	#8
c-man405 Registered User Join Date: Apr 2013 Location: oswego illinois Posts: 49	Re: I want to order some 18" coys... just curious. i might have missed is but what coys are you looking at??

02-12-2014, 07:07 PM	#11
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Re: I want to order some 18" coys... .. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)

02-12-2014, 08:03 PM	#13
muthstryker Registered User Join Date: Dec 2009 Location: Snohomish, Washington Posts: 1,187	Re: I want to order some 18" coys... How tall of a tire are you wanting? Most 295-305 tires for 18s are under 26 inches tall. __________________ Matt

02-12-2014, 10:23 PM	#15
muthstryker Registered User Join Date: Dec 2009 Location: Snohomish, Washington Posts: 1,187	Re: I want to order some 18" coys... That'd be cool, have you seen the Nitto INVOs? Amazing tire and they have the perfect sizes 255/40/18 front and 295/35/18 rear. 26 inches tall front and rear. When you get your 18s id love to stop by and check it out, ive never seen 18s in person and im torn between 18 and 20s right now __________________ Matt

02-12-2014, 10:57 PM	#17
muthstryker Registered User Join Date: Dec 2009 Location: Snohomish, Washington Posts: 1,187	Re: I want to order some 18" coys... Ive been staring at my return for the last week lol __________________ Matt

02-12-2014, 11:00 PM	#18
cory d Registered User Join Date: Dec 2011 Location: Arlington WA Posts: 1,728	Re: I want to order some 18" coys... 25.5" tall tire and 3.37s. oooou we. TIME FOR OVERDRIVE __________________ GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread

02-13-2014, 03:54 AM	#20
cory d Registered User Join Date: Dec 2011 Location: Arlington WA Posts: 1,728	Re: I want to order some 18" coys... chuch-ing __________________ GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread

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