Different series size for front and back ? - Team Camaro Tech
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post #1 of 19 (permalink) Old Jan 17th, 07, 08:35 AM Thread Starter
 
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Different series size for front and back ?

Guys,
I have been doing a lot of research here on rims and tires. I going with 17 rims, but I am confused about tire profile sizes. I see that a lot of people are running a 45 series in the front and 40s in the rear. What is the reason for this?
Thanks
Larry
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post #2 of 19 (permalink) Old Jan 17th, 07, 08:46 AM
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Re: Different series size for front and back ?

Most guys with first gens run a wider tire in the rear than in the front. S
FOr example on my car I run 225/45R17 BFG's up front and 275/40R17 MT DR's out back. My front tires are @ 25" high with a 8 7/8" section. The rears are @ 26" high with an 11" section. I would have run a taller tire out back if I wouldn't have had to go to a narrower tire.


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post #3 of 19 (permalink) Old Jan 17th, 07, 10:57 AM Thread Starter
 
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Re: Different series size for front and back ?

Thank you

As I read your reply it finally hit me. I thought that the series or profile size was a standard height. I now know that it is a percentage for the with of the tire.

Thanks again,
Larry
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post #4 of 19 (permalink) Old Jan 17th, 07, 12:29 PM
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Re: Different series size for front and back ?

Just to elaborate more on what Harley has said... Start with 245/45/17's up front and 275/40/17's out back and your tires will be the same height front and rear at 25.7" tall. That also means your sidewall will be the same height front and back. Of course the rear is a bit wider than the front but the sidewall and tire height is the same. When setting up your car it's all about the details and this combo makes it easy say on a '69 with a 2" front drop and 1.5" rear drop to get that stance we all desire.

That's pushing it size wise and I didn't want any rubbing and scrubbing with the car loaded with 4 people and a trunk full. I scaled back some and ran 235/45 and 255/45 17's on my ragtop. 255's are 26.1" tall and the 235's are 25.5" making the sidewalls on the rear 3/10" taller than the front. It's not so much that it can't be over come by running a couple extra lbs pressure in the front and a couple less in the rear.

Now I'm really nit picking but we tend to do that with our cars and the wrong combo can effect the whole look of the car. Stance makes or breaks a car and suspension height and tire and wheel work together to give you that killer stance...

...Dennis

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post #5 of 19 (permalink) Old Jan 17th, 07, 05:28 PM
 
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Smile Re: Different series size for front and back ?

Fwiw, I dearly still love my E-60 and L-60/14's look for BnL's!! (L's are a modern, 298-53/14, I forget what the E's are?? 205-60/14's?? I know a D-70/14 Redline is a 200-70/14)........

They are like 25.5" and 26.5" tall, OLD-SCHOOL all the way on slotted mags!!

I went with 45's but wished I would have hunted up a BnL set of 50/17's. OR 55's if they even make them..?????????????

pdq67



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post #6 of 19 (permalink) Old Jan 17th, 07, 07:23 PM
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Re: Different series size for front and back ?

WOW!! L60-14. Man I have not heard that number mentioned in a long time. Back around 1990 or was it 1991, I bought a pair of those from a friend of mine who was restoring a 1969 Mach I Mustang. They looked cool on the rear of my first ever Camaro (a 1969). But wow, that was a stiff squirmy ride in the back.

I am old school too...I have P235/60/R15's on my current 1969 all the way around.

1) 1969 Camaro RS 396 TH 400, 12 bolt 3:73 sold 1994
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post #7 of 19 (permalink) Old Jan 17th, 07, 11:05 PM
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Re: Different series size for front and back ?

L60 15's on the back, and G60 14's on the front- on either Cragar SS, Keystone Klassics, or aluminum slots is a pretty cool "old school" combo. if you had a serious car, you were running N50 Mickey's on the back.
definitely NOT what most people like today- and most certainly not really pertinent to this thread- but, hey, if you don't know where you came from, you can't know where you're going..

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post #8 of 19 (permalink) Old Jan 18th, 07, 01:05 AM
 
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Re: Different series size for front and back ?

Ditto Nova!!

I still like the old Sonic Maxima's that had the square shoulders that made the tread almost as wide as their section width.

I want to say L-60/15's?

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post #9 of 19 (permalink) Old Jan 18th, 07, 05:26 AM
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Re: Different series size for front and back ?

I ran a pair of N-50's on my 73 Z back in high school. The tires had a nice red line 3 inches in fron the side walls from the rubbing. those were the days nice smokey burn outs filling the car and my lungs

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post #10 of 19 (permalink) Old Jan 18th, 07, 02:02 PM
 
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Re: Different series size for front and back ?

You know all this is pertinant to this thread b/c it's a visual thing and also a tire size ratio deal too!

Old-school or new-school, you still have to come up with what YOU like!!

I have to run 17" wheels to clear my "pdqCBB" 13" and 11.75" disc brakes OR I would have went with modern tires like I had before...

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post #11 of 19 (permalink) Old Jan 18th, 07, 10:41 PM
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Re: Different series size for front and back ?

well, pdq, yo uare aware that you can get Cragars and slots in sizes up to 20" now..
not sure about finding a set of L60 20's, tho..

you don't plan sincerity.
you have to make it up on the spot.

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post #12 of 19 (permalink) Old Jan 18th, 07, 11:35 PM
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Re: Different series size for front and back ?

All I could afford back in 73 were Super Mag 60 L60X15 on ET mags. A spinoff of Cragars.

Dennis
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post #13 of 19 (permalink) Old Jan 19th, 07, 04:16 AM Thread Starter
 
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Re: Different series size for front and back ?

Thanks for reading my post. The reason I asked the question is I have a 69 with stock suspension and want to buy 17 rims. I cant decide if I want 245/45 fronts and 275/40 rears or play it safe and get 235/45 front and 255/45 rears. What do you guys think?
Thanks
Larry
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post #14 of 19 (permalink) Old Jan 19th, 07, 09:41 AM
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Re: Different series size for front and back ?

Hey Larry, What shape is your suspension in? Also your frame mounts? That's the key even with a stock suspension to getting wide tires on your car. My ragtop has more body flex than a coupe and after trying 245's and 275's on it I went with 235's and 255's. On the right wheels it's hard to see the difference but really helps eliminate scrubbing...

...Dennis

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post #15 of 19 (permalink) Old Jan 19th, 07, 11:18 AM
 
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Smile Re: Different series size for front and back ?

Right Nova, NOW!

But back when I bought my Pony-car "Bullitts" on sale from Summit, the CRAGAR 20" SS's weren't around!

And I figure anything bigger than a 17" on our old cars just doesn't cut it to me, but it's just me personnally..............

I say this b/c I really like 50, 55 and 60 series donuts vs 35, 40 and 45 SK-8 Board tires...

The ONLY reason I went 45's is b/c I couldn't find any 50 or 55/17's

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