What is the widest tire I can I can use? - Team Camaro Tech
Wheels & Tires What fits what?

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post #1 of 24 (permalink) Old Dec 14th, 19, 07:34 PM Thread Starter
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Randy
 
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What is the widest tire I can I can use?

what is the widest wheel and tire you can put in the rear on a 67? I have 235/70/14's on the front and back at the moment. Also wondering if I can go with a 17" wheel and tire without it feeling like I'm riding on the rim, and what you would recommend. I had a 64 impala ss back in the day that had 50 series tires on the back and 70 series in the front. and loved the look. At least I did back in the day. Don't know what the diameter or any other spec was. That was 40yrs ago, but I'm going for that look on my Camaro. I did a little research, and looks like 17" rims and tires seem to be the most popular, making the 17" tires the most economical, but couldn't find any raised white letter. I like that old school muscle car look, but rwl is not a deal breaker. I found a set of 17"x7", 17"x8" cragars for 1200.00. What size could I put on that 8" rim without rubbing, tubbing or cutting the wells, just slap them on and go? All help is appreciated.
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post #2 of 24 (permalink) Old Dec 14th, 19, 09:38 PM
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Garth
 
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Re: What is the widest tire I can I can use?

I can't offer much advise (experience) on 17's, but the old school 295/50/15's are still being used today. Check out Stevo's 67 ...https://www.camaros.net/forums/17-wh...15-wheels.html

Doug's 68 has some pretty wide meats, too. I don't recall what size, thinking 275/60/15...?
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post #3 of 24 (permalink) Old Dec 14th, 19, 09:52 PM
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Re: What is the widest tire I can I can use?

Quote:
Originally Posted by randydray View Post
what is the widest wheel and tire you can put in the rear on a 67? I have 235/70/14's on the front and back at the moment. Also wondering if I can go with a 17" wheel and tire without it feeling like I'm riding on the rim, and what you would recommend. I had a 64 impala ss back in the day that had 50 series tires on the back and 70 series in the front. and loved the look. At least I did back in the day. Don't know what the diameter or any other spec was. That was 40yrs ago, but I'm going for that look on my Camaro. I did a little research, and looks like 17" rims and tires seem to be the most popular, making the 17" tires the most economical, but couldn't find any raised white letter. I like that old school muscle car look, but rwl is not a deal breaker. I found a set of 17"x7", 17"x8" cragars for 1200.00. What size could I put on that 8" rim without rubbing, tubbing or cutting the wells, just slap them on and go? All help is appreciated.
On a 67 Camaro, don't go over a 255 wide tire IMHO. Drag racers run a 275 but most say it rubs on bumps and when passengers are on board.

Backspace on the wheels is critical. On a 7" wide wheel, 4" to 4.25" backspace is good.
On a 8" wide wheel, 4.5" to 4.75" is ideal.
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post #4 of 24 (permalink) Old Dec 15th, 19, 12:35 AM
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If you’re planning big brakes do 18s. Much better brake options. If you nail the backspace you can do 245 up front and. 275 out back. I run a 245/40 275/35 18 on my car. I’m doing a 275/40 next time. Lots of good info in search.
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post #5 of 24 (permalink) Old Dec 15th, 19, 01:39 AM
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My 68 with a 3” Hotchkis drop front and back had 235 front 275 on back, 18”’wheels.
No issues.

245 on front now with same 3” front drop.

Noticed some slight scuffs on inner fender bolts during last autocross with 2deg -camber.
If you just street, probably a nonissue.
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post #6 of 24 (permalink) Old Dec 19th, 19, 01:24 AM
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Re: What is the widest tire I can I can use?

Randy, generally I try to avoid this topic (max size tire fit) as it's such a borderline situation, naturally what works for one person may not for the next guy. With a stock set-up (suspension, wheel wells, etc,), I tend to agree with Beth on 255 in the rear as that's what I have on a 4.5" back space, 8" wheel and it's awfully close. Many folks it seems, get away with 275, but I'm not sure how. It really comes down to the suspension and how far the axle can travel, IMO. Was hoping Stevo would chime in on that 295 set-up !

I had 275's on my first Camaro (first car), a 67, back in the day, but had air shocks. If I let it down too low, the tires would rub. I don't recall the back space on the Cragars...

  • '68 RS, AA, 749, L30, M(uncie)20 (originally a 3spd), 15yr backburner resto........
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post #7 of 24 (permalink) Old Dec 19th, 19, 06:29 AM
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Re: What is the widest tire I can I can use?

i'm running 275/60/15 on 8" rims with 4.5" BS. no issues but i do have multi leafs that keep the rear up a little higher than i would like. i've been wanting to go to the calvert split mono's but i'm scared i'll start getting tire rub. right now the car is a street / strip car and hooks up great on drag radials with caltracs and adjustable shock along with those multi leafs so i may just leave it alone. i've had 69's as well with 275/60/15 no issues
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post #8 of 24 (permalink) Old Dec 19th, 19, 06:33 PM
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Re: What is the widest tire I can I can use?

https://www.camaros.net/forums/17-wh...re-combos.html

Some good reading from members who have run these sizes.... Happy hunting

275/60R15 and 275/50R17 are VERY close to same size mathematically.


275 is the width in mm and to convert to inches you divide by 25.4
60 is the aspect (sidewall) in percent of the height
R15 or 17 or ?? is the wheel diameter





Quote:
Originally Posted by Garfields Maro View Post

Doug's 68 has some pretty wide meats, too. I don't recall what size, thinking 275/60/15...?

275/60R15's is correct on 15x8 Weld ProStars with 4.5" BS.... Had 285/60R15 SH McCreary's which did rub on wheel well lips or shocks on hard turns and off camber bumps
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Last edited by DOUG G; Dec 19th, 19 at 06:53 PM.
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post #9 of 24 (permalink) Old Jan 7th, 20, 04:10 AM
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Re: What is the widest tire I can I can use?

I also need help, thinking of getting 18s. Currently have 17x8, 4.5bs, 0 offset on 235/45 and 245/45. Car is lowered, Streetgrip, with a 3/8" coil spacers upfront (had rubbing issues before) and including 1" lowering kit in the rear.

Would this setup be ok? It's the closest ride height setup to what I'm on now.

Front: 18x8, 4.75bs, 235/40
Rear: 18x9, 5.25bs, 275,35
or
Rear: 18x9.5, 5.5bs, 275/35

-any idea on offset to go with? (aim is to have deepdish style wheels).

Measurements from ground to fender:


Gap between rear tire and fender: 1.9"

1968 Camaro SS
LS2/T56
RideTech StreetGrip


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post #10 of 24 (permalink) Old Jan 7th, 20, 09:33 AM
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Re: What is the widest tire I can I can use?

I have been running 235/45/17 front 275/40/17 rear on my 67 with stock suspension for years with no issues. I can't see where you could go any bigger than this on stock suspension with out doing some cutting

Chris
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post #11 of 24 (permalink) Old Jan 7th, 20, 09:57 AM
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Re: What is the widest tire I can I can use?

Quote:
Originally Posted by rs67 View Post
I have been running 235/45/17 front 275/40/17 rear on my 67 with stock suspension for years with no issues. I can't see where you could go any bigger than this on stock suspension with out doing some cutting



Chris


Not going bigger, except the 1” from the 18” wheel.

The tire setup i said above will give an almost equal diameter to what I currently have.

235/45/17 = 25.3”
245/45/17= 25.7”
-
235/40/18= 25.4”
275/35/18= 25.6”


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post #12 of 24 (permalink) Old Jan 7th, 20, 11:37 AM
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Re: What is the widest tire I can I can use?

Quote:
Originally Posted by majj35 View Post
Not going bigger, except the 1” from the 18” wheel.

The tire setup i said above will give an almost equal diameter to what I currently have.

235/45/17 = 25.3”
245/45/17= 25.7”
-
235/40/18= 25.4”
275/35/18= 25.6”


Sent from my iPhone using Tapatalk
So are you 2" lower in the rear compared to stock with the street grip and the 1" lowering blocks? Reason I ask I am installing the ridetech 4-link in the next couple weeks and wondering if my current 275/40/17 will work with after the 2" drop from the 4-link?

Thanks, Chris
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post #13 of 24 (permalink) Old Jan 7th, 20, 12:12 PM
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Re: What is the widest tire I can I can use?

Quote:
Originally Posted by rs67 View Post
So are you 2" lower in the rear compared to stock with the street grip and the 1" lowering blocks? Reason I ask I am installing the ridetech 4-link in the next couple weeks and wondering if my current 275/40/17 will work with after the 2" drop from the 4-link?

Thanks, Chris
I lowered my 68 3" and had a 275 with stock tubs.

1968 Butternut Coupe,
421" Dart SHP block
TKO 600 RR
Dutchman 9" w/3.70
Speedtech torque arm,Ridetech HQ coilovers
Global West arms
Budnik wheels

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post #14 of 24 (permalink) Old Jan 8th, 20, 02:02 AM
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Re: What is the widest tire I can I can use?

Quote:
Originally Posted by rs67 View Post
So are you 2" lower in the rear compared to stock with the street grip and the 1" lowering blocks? Reason I ask I am installing the ridetech 4-link in the next couple weeks and wondering if my current 275/40/17 will work with after the 2" drop from the 4-link?

Thanks, Chris
I initially had 275/40/17 on stock height, and mostly everyone told me i'll be rubbing after installing my ridetech streetgrip (i have leafs not 4 link). so I swapped to 245/45. I had so much room between the tires and fender 2.5".
I later got the 1" lowering block, and now still have 1.9" gap. So I think a 275/40/17 would be ok, since 245/45/17 (what i have now) has the exact overall diameter 25.7"

This answers tire sizes, now the real question depends on wheel offset and backspacing, which is what I'm trying to find out in order to order the correct wheel sizes

1968 Camaro SS
LS2/T56
RideTech StreetGrip


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post #15 of 24 (permalink) Old Jan 8th, 20, 04:48 AM
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Re: What is the widest tire I can I can use?

ok so found this online offset calculator: https://tiresize.com/wheel-offset-calculator/

So if i understand correct. Backspacing on 8" wide wheels should= 4.5" -->thus 0mm Offset

and if going with 4.75 backspacing = 6mm offset

For rear:
9.5" width, backspace = 5.25" --> = 6mm offset
9.5" width, backspace = 5.5" --> = 6mm offset

1968 Camaro SS
LS2/T56
RideTech StreetGrip


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