Tires rubbing after Disc Brake Conversion - Team Camaro Tech
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post #1 of 16 (permalink) Old Feb 11th, 13, 03:23 PM Thread Starter
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Derik
 
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Tires rubbing after Disc Brake Conversion

A while back I had front disc brakes installed on my 68 and every since I have been having issues with the front wheels rubbing top portion of the inner fender when going over bumps on the freeway (much more so when other people are in the car). Before the disc break conversion there was no rubbing at all.


Currently I have 245/60-15's all the way around that are mounted on 15X8 rallys (I believe the BS is 4.25). I was thinking of going with 255/60-15's in the rear as there appears to be plenty of space to go slightly bigger with out any rubbing. With the fronts, I have no idea what the best option would be. I was thinking of going with 235/60-15's but I dont know if that is small enough to stop the rubbing (upper fender bolts were taking chunks out of the outer edge of the tire tread until I replaced them with low profile smooth hex bolts) . I thought about 225/60-15's but I'm not sure how those would look mounted on 15X8 rims.


Can anyone that has done the front disc brake conversion tell me what is the max tire size that will fit without rubbing? The 235's would be my first choice but I dont know if a 2/5" reduction in width and a 1/4" reduction in sidewall height is enough to compensate.


Thanks!
-Derik




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post #2 of 16 (permalink) Old Feb 11th, 13, 03:31 PM
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Brian
 
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Re: Tires rubbing after Disc Brake Conversion

Depends on which kit since some will push the wheels out further than others. Which kit did you use?
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post #3 of 16 (permalink) Old Feb 11th, 13, 04:13 PM
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Re: Tires rubbing after Disc Brake Conversion

A lot of conversion kits move the wheel outboard. There are zero offset kits available.

Going down one size is probably not going to stop it from rubbing.

I would change to a wheel with proper offsets and keep the tire sizes.

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post #4 of 16 (permalink) Old Feb 12th, 13, 03:55 AM
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Mikael
 
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Re: Tires rubbing after Disc Brake Conversion

Hi,
I cant answer you on all your questions but I have 225/60-15 in front and 245/60-15 (rear) all on 15x8 Rallys with 4" BS and they rub the front and rear fender lips. The 225/60-15 fits perfect on a 8" rim. The rim to use for this tire dimension is 6-8".
My 225 Goodrich T/A:s has a section width of 9.7" on a 8" rim so the tire is a little bit wider than the rim.
By the way - my 8" Rallys are 9" wide between the outer edges.

I cant find the thread now but I did save the info on my pc so here it is:
Quote:
If you are going with 15" rims a good combo for 67 is
front: 15x7 w/4.25 backspace and 225/60 tire
back: 15x8 w/4.5 backspace and 255/60 tire.
I guess the 67 and 68 require the same rim/tire setup.

Also, on my 67 with front drums the distance between the drum brake mounting surface and the steering joint is 4,8".

/Mikael

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Last edited by Elmer; Feb 12th, 13 at 03:58 AM. Reason: added front backspace
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post #5 of 16 (permalink) Old Feb 12th, 13, 04:12 AM
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Nice looking 68!
I did a disc conversion and it pushed my wheels out also. They used to scrub the frame on tight turns but not anymore. I have 235/60-15 on 15x7 ralleys on the front. No rubbing on fender bolts. If its damaging the tire take out the fender bolt for now.


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post #6 of 16 (permalink) Old Feb 12th, 13, 04:27 AM
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Re: Tires rubbing after Disc Brake Conversion

I have 225-60-15 front and 245-60-15 rear on 8" Vette wheels . . . . no problem rubbing.
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post #7 of 16 (permalink) Old Feb 12th, 13, 05:01 AM
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Re: Tires rubbing after Disc Brake Conversion

Derik,

When I bought my ’67 in the 80s it came with 15x8 Rallys. I always had rubbing on the fenders no matter what I did. I recently put on new BF Goodrich 235/60-15s and the rubbing was so bad I was afraid to drive it. I bought some 15x7 FW coded Rallys on eBay and no rubbing at all, first time in 30 years. I still have drums on the front of mine. Nice looking 68!

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post #8 of 16 (permalink) Old Feb 12th, 13, 08:49 AM
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Re: Tires rubbing after Disc Brake Conversion

My car has Hotchkiss 2 inch drop springs in the front and regular mono leafs in the rear.

Your car looks like it has regular springs front and back (judging by the wheelwell gaps) and therefore sits higher than my '67.

I have your same setup in the back; 15x8 ralley rims (aftermarket 4.25 BS, not Corvette rims) with the same tire (Cobra GT 245 60 R15). Not that I was having a rubbing issue in the back, but I just reduced my rear Cobra GTs from the 255 to the 245. The 255 are a little too wide for the 15x8 rim and bulge, the 245s fit better, look better and handle better (less sidewall flex from the bulge). I'd personally stick with the 245s in your case.

For the front I have the JL8 setup where I used to have '72 Nova GM front disc brakes. Both brake systems push the front tire out from the drum only setup. I didn't have a problem with rubbing with the Nova brakes and I don't have a problem with the JL8 (which pushes the tires out a little more). For the front I've always run a cheap/common GM 15x7 FW rally rim with Cobra GT 235 60 R15. No issues.

I loose the advantage of being able to rotate tires due to the stagger between the front and rear wheels, but everything fits, works great and is VERY inexpensive. Besides, I like the old school rally wheel look.
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post #9 of 16 (permalink) Old Feb 12th, 13, 09:04 AM Thread Starter
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Derik
 
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Re: Tires rubbing after Disc Brake Conversion

Thanks for the great feedback! Unfortunately I dont know the manufacturer of my disc brake conversion but it appears the wheel has been pushed out about 1/4". With the 15X8 Vette rims I never had a problem with the tires rubbing the fender lip in the front or back but even before the conversion the tires would rub on tight turns.

I am going to take one of the wheels off tonight and measure the backspace to make sure it is 4.25, but what I was thinking was sticking with the current rims in the rear but slightly increasing the tire size to 255/60-15, and then going with new 15X8 rallys in the front with a 4.5" backspace and 235/60-15 tires (to help with the turning rub a little). I was contemplating getting new American Racing rims all the way around but I want to keep my cost down so I have more money for other things (will be posting more on that in another thread), and I do like the classic look of the rallys.
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post #10 of 16 (permalink) Old Feb 12th, 13, 09:44 AM Thread Starter
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Derik
 
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Re: Tires rubbing after Disc Brake Conversion

I thought about going with a 15X7 in the front with a 4.25" BS, but I assume I would need a new trim ring for the 7" rim. Regarding rally rims, one problem I have been running into is where to get them and making sure they match the color and appearance of my existing rimes. Lots of places sell them in a ton of configurations and colors.
As far as 255 vs 245 in the rear, I do like the look off the 245's but thought the 255's might help fill up the wheel well a little better. Unfortunately I have seen any pics for this specific setup so I have no idea how much bulge would be present.

Quote:
Originally Posted by mahunt View Post
I have your same setup in the back; 15x8 ralley rims (aftermarket 4.25 BS, not Corvette rims) with the same tire (Cobra GT 245 60 R15). Not that I was having a rubbing issue in the back, but I just reduced my rear Cobra GTs from the 255 to the 245. The 255 are a little too wide for the 15x8 rim and bulge, the 245s fit better, look better and handle better (less sidewall flex from the bulge). I'd personally stick with the 245s in your case.

For the front I have the JL8 setup where I used to have '72 Nova GM front disc brakes. Both brake systems push the front tire out from the drum only setup. I didn't have a problem with rubbing with the Nova brakes and I don't have a problem with the JL8 (which pushes the tires out a little more). For the front I've always run a cheap/common GM 15x7 FW rally rim with Cobra GT 235 60 R15. No issues.

I loose the advantage of being able to rotate tires due to the stagger between the front and rear wheels, but everything fits, works great and is VERY inexpensive. Besides, I like the old school rally wheel look.
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post #11 of 16 (permalink) Old Feb 12th, 13, 10:54 AM
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Re: Tires rubbing after Disc Brake Conversion

Quote:
Originally Posted by Vimstar View Post
I thought about going with a 15X7 in the front with a 4.25" BS, but I assume I would need a new trim ring for the 7" rim. Regarding rally rims, one problem I have been running into is where to get them and making sure they match the color and appearance of my existing rimes. Lots of places sell them in a ton of configurations and colors.
As far as 255 vs 245 in the rear, I do like the look off the 245's but thought the 255's might help fill up the wheel well a little better. Unfortunately I have seen any pics for this specific setup so I have no idea how much bulge would be present.
I have 15x7 GM rallys on the front and Corvette 15x8 rallys on the rear, both with 235 60's. The only time I have any rubbing at all is if I have the front wheel turned nearly to the stop and hit a decent bump. Normal driving they dont rub.

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post #12 of 16 (permalink) Old Feb 12th, 13, 11:25 AM
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Re: Tires rubbing after Disc Brake Conversion

I have 245 x 60x 15 on stock 15 x 7, same bs front and rear. I suspect that its the effect of an inch wider wheel as it gives the tire more body. I have stock front discs and sometime they do rub on the headlamp motor cover splash shield.
I just recently replaced the two inner fender apron bolts with buttom head cap screws. I could tell by looking at the bolt head , that was a lot of rubbing going on , especially on a bump, turn . Maybe try this bolt change and give it a road test.

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post #13 of 16 (permalink) Old Feb 12th, 13, 12:39 PM
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Re: Tires rubbing after Disc Brake Conversion

What are your alignment specs?

1/2 degree of neg camber could possibly solve your problem.


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post #14 of 16 (permalink) Old Feb 21st, 13, 03:03 PM Thread Starter
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Derik
 
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Re: Tires rubbing after Disc Brake Conversion

Had a few things come up but finally getting back to the Camaro. I measured all the rims and verified they are 15X8 with 4.25" backspace. I went ahead and order some new rally's for the front that are 15X7 with the same 4.25" backspace and was thinking of going with 225/60-15 up front and sticking with the 245/60-15 in the rear. I thought about going 235's up front and 255's in the rear but I am not sure if that would look good (especially the rear) or if I would still have rubbing issues in the front. The rims haven't come in yet so I still have a little time to decide on the tire sizes.
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post #15 of 16 (permalink) Old Feb 21st, 13, 05:09 PM
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Re: Tires rubbing after Disc Brake Conversion

Do you have new springs on the front of the car ? They may have relaxed ,and now letting the car sit lower on the front. If not I'd go with 15x7 on the front with 225 60, This is what I have with 2in drop springs. Never a rub.
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