225/60/15, 4"BS, CPP Disk Conversion - Team Camaro Tech
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post #1 of 13 (permalink) Old Nov 5th, 13, 02:05 PM Thread Starter
Len
 
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225/60/15, 4"BS, CPP Disk Conversion

Hey all. Is there anyone running this combo on the front of their 67-68's? I'm kind of stuck with the 15x7, 4"BS wheels at the moment and was hoping to squeeze 225/60/15's on without any rub. I have the CPP disk conversion that I've read push each wheel out about an inch from the stock drums which adds to my incorrectly backspaced wheels. Also, I'll be installing the Hotchkis 2"drop springs to get her to sit low for better handling. I've searched/read a whole bunch of different setups but cant seem to find all the same specs i'm thinking of in one setup.

Thanks in advance.

- Jersey
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post #2 of 13 (permalink) Old Nov 5th, 13, 02:22 PM
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Steiner
 
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Should only come out maybe 1/4". I have the same wheels with 235/60 on a '69 and the tires scrub the fender bolts, but only on hard turns that make the front end compress. '68 may clear better due to the fender setup, I don't know.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
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post #3 of 13 (permalink) Old Nov 5th, 13, 04:43 PM
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Hmmmm...
I know this question is about '67\'68, but I'm running 235/60's on 15x7 wheels with 4" backspace, Hotchkis lowered and a factory type disk brake setup and I've never had tire rub problems in front at all. Even with my 300lb friend in front and driving like I stole it.
Maybe it matters how the fenders are mounted\aligned from car to car.

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post #4 of 13 (permalink) Old Nov 5th, 13, 04:45 PM
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Len,
I am running that tire and BS ( rally wheels)on the front of my 67 with 69 front disc setup. My car is not lowered.
John

67 383 stroker 460hp RS SS clone 4sp blk on blk m21 Chevelle 12 bolt rear end
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post #5 of 13 (permalink) Old Nov 5th, 13, 06:09 PM Thread Starter
Len
 
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Thanks for the info guys. I guess I should really do some research on the width differences from left to right mounting surfaces between a stock drum setup, stock disk setp and drum to disk conversion. Right now I'm running 215/70's with weak front springs. She rubs on good bumps on the upper outside part of the inner wheel well, it's not quite as low as I'd like & I need some more width than those 215's to improve handling... as much as I can with a 60 series tire anyway. Will a 225 satisfy? Maybe. Would a 245? For sure. Lol.

I'm thinking i may just have to bite the bullet and get a new set of front rims with a bit more BS. $300 for an extra 20mm... Hmm.

Thx again for the replies.
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post #6 of 13 (permalink) Old Nov 5th, 13, 06:27 PM
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Is a 15x7 w/4" BS rally wheel really that common? Factory YH and FW 15x7 rallys come with 4.25 BS. You would think the aftermarket would have followed the factory measurments.

The 1/4" less backspacing probably really helps the inside scuffing that 235/60's seem to do when turning lock to lock and the '67/'68 round wheel wells probably allow the extra wheel and tire on the outside. Your 225's are 1/2" shorter and 1/2" narrower than a 235 and will probably fit fine...

The disc's move the mounting pad out about 3/32" not a full inch as you were thinking...

...Dennis

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post #7 of 13 (permalink) Old Nov 6th, 13, 03:31 AM
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Steiner
 
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Yeah, you'd think so Dennis. I found the receipt from the previous owner for the ones I have and they came from Year One several years ago, and the receipt even says 4". Someone messed up somewhere along the way I reckon.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'02 Z/28 vert-stock-sold and totaled
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post #8 of 13 (permalink) Old Nov 6th, 13, 04:59 AM
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Re: 225/60/15, 4"BS, CPP Disk Conversion

I am looking for wheels right now and finding anything over 4" of back space takes the price up from $180 to over $300 per wheel. They are special order and can take up to 6 weeks.
I am also finding that they do not make a special order wheel design that you can match up with a standard order 4" backspace. That means you must buy 4 wheels if you want them to match and have 2 different BS on the front and back.
I am running 7" wide 15" rally wheels now. 4" BS front with 4.25BS rear. 225 60 front 255 60's rear and it works great.
If I choose a wheel with 4" BS for $200 you can not order the same wheel in a 4.25BS. You have to find a special order wheel and order 4 of them for over $330 each. Am I missing something here?
I am looking for chrome torque thrust D or TT2 style wheels.

Does anyone know where I can buy 4.25 BS from a co that stocks them?
John

67 383 stroker 460hp RS SS clone 4sp blk on blk m21 Chevelle 12 bolt rear end
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post #9 of 13 (permalink) Old Nov 6th, 13, 05:27 AM
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Stock 15x7 GM rally FW rims are 4.25 and are VERY easy to come by.

Google rally FW 15x7 and start shopping.
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post #10 of 13 (permalink) Old Nov 6th, 13, 06:05 AM
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Michael,
Thanks for info but I already have the rally wheels. I am looking for vintage mags like a torque thrust D style in two different BS 4" and 4 1/4".
John

67 383 stroker 460hp RS SS clone 4sp blk on blk m21 Chevelle 12 bolt rear end
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post #11 of 13 (permalink) Old Nov 6th, 13, 06:54 AM
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Steiner
 
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Re: 225/60/15, 4"BS, CPP Disk Conversion

I've got five FW wheels in the garage but the Year One set that came on the car is in better shape. Plus it's actually got to get driven to rub so there hasn't been an issue in months....

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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post #12 of 13 (permalink) Old Nov 6th, 13, 10:23 AM Thread Starter
Len
 
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Re: 225/60/15, 4"BS, CPP Disk Conversion

Thanks all.

Dennis, so you're saying that when doing a drum to aftermarket disk conversion, it only moves EACH mounting pad out 3/32, correct?

John, I checked the Eagle 211's I have and they don't come with a 4.25 BS either. May need to go with the 4.5 & 1/4" spacer, if the spacer thing wouldn't bother you.
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post #13 of 13 (permalink) Old Feb 10th, 14, 04:09 PM
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Steve
 
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Re: 225/60/15, 4"BS, CPP Disk Conversion

I had the same issues and finally found TT2's at Summit Racing with 4.25 backspace.They are a 2 piece polished wheel which is common. They are special order but Summit try's to keep them in stock. Part number is ARE-405576142. They current have 3 in stock on 2/8/14. They take 4 weeks if you have to order.
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