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 factory wheel and tire size
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ponchpowpow
Two Feathers

62 Posts

Posted - 10 May 2019 :  1:22:22 PM  Show Profile  Reply with Quote
can someone tell me:

1) the factory wheel and tire size for the 68 FB?

2) were there variations in factory sizes?

3) were the tires sizes the same for the 67-69 FB?

i see a lot of 255/60 15 in the back and 225/70 15 in the front. is this a common set up? the 255 looks good but a little big, IMO.

i know its personal preference but would 245/60 15 back and 235/60 15 front work/look good? anyone with this set up?

**will be using the rally 2 wheels**


Edited by - ponchpowpow on 10 May 2019 1:23:27 PM

Blued and Painted
Chief PONTIAC

USA
3510 Posts

Posted - 11 May 2019 :  01:43:00 AM  Show Profile  Reply with Quote
I can't remember when GM introduced radial tires. Could be several different option packages like 14 or 15 inch with diferent widths. A bias ply tire size might look like
G-70-15.


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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Bill Boyle
Horse Feathers (Charter Member)

USA
5202 Posts

Posted - 11 May 2019 :  12:15:59 PM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
E-70 on base model FB and optional F-70,: some with white stripe, red line or blackwall; These were bias belted 14 inch tires. Many used Rally II for sporty look others had hub caps.

There appears to have been a rayon radial tire available but very narrow at 195R-14.

++++++=

What size rims do you have and what size rims do you want?

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.

Edited by - Bill Boyle on 11 May 2019 12:27:31 PM
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ponchpowpow
Two Feathers

62 Posts

Posted - 13 May 2019 :  11:50:50 AM  Show Profile  Reply with Quote
i currently have old school deep dish cragars from my high school days. i want to get away from that and go for more of a stock look. rally 2's for sure but still deciding which tire size. i dont see many firebirds where im at, just camaros. most the camaros have the 255/60 15's on back and 225/70 15 front. it looks good and im not against that but maybe im looking for same size all around.

my plan is rally 2's with a 15" diameter wheel. are the E-70 and F-70 similar to the 225/70 15's? is the 225/70 15 X4 a fairly commom selection?

also, anyone here use the 255/60 15 back and 225/70 15 front? does that combo look good on FB's?

anyone got pics of their tire combos? thanks

Edited by - ponchpowpow on 13 May 2019 12:03:26 PM
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Bill Boyle
Horse Feathers (Charter Member)

USA
5202 Posts

Posted - 13 May 2019 :  2:45:28 PM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
255/60-15 radial tires are 27.1" tall. They are wide tires and look best on an 8' wide rim.

Stance is a matter of preference. 27" tall tires fill the wheel wells nicely, IMO. A slightly narrower tire, 245/60-15 radials which are 26.6" tall will lower the front a little yet looks darn good with larger 255s in the rear. On my 79 TA I've had 245s all the way around at one time but later switched to 255s. They looked good either way. Height difference does not effect overall appearance.

My TAs original tire size was 225/70-15, 27.4" tall and just .3" taller than the wide 255 60 series meats. With the same size tires front and rear, you can rotate them. With mixed series or mixed widths, it would not be right to do for obvious handling and appearance reasons.

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.
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beertracker
Cochise

427 Posts

Posted - 14 May 2019 :  10:47:22 PM  Show Profile  Reply with Quote
Radials on Pontiacs was called RTS: Radial Tuned Suspension. A yahoo search may shed light on this? bt
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Steve C.
Chief PONTIAC

1995 Posts

Posted - 15 May 2019 :  6:30:31 PM  Show Profile  Reply with Quote
Firebird / Trans Am Dash Emblem .... RTS, Radial Tuned Suspension.


Edited by - Steve C. on 15 May 2019 6:31:07 PM
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