Tires Bias to Radial - Second Generation Pontiac Firebird (1970 - 1981) - Firebird Nation

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Tires Bias to Radial


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4 replies to this topic

#1 Zeprocks#1

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Posted 3 weeks ago

I'm changing from F70/14 F.S. Wide ovals to BF Good. Radial T/a's. Tire rack states the equivalent is 215 70R14 so can any one say for sure I can't go the next size up or will 225's fit? They don't recommend it. THX F.B.



#2 JoePeek

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Posted 3 weeks ago

Not sure about this question, but when you go to radials, the front end alignment settings are a bit different. Years ago I remember looking at the castor, camber toe-in specs, for different years to set up my '71, even looked at second gen Camaro specs, While the same basic steering/suspension geometry was used from '70 to '81 F body, the front end settings were not the same through the years. Seems like when the factory went to radials, the front end settings changed as well.....which makes sense.



#3 NOT A TA

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Posted 3 weeks ago

They may not recommend the 225's based on the width of your wheels.

 

How wide are your wheels?


John Paige

Lab-14.com


#4 Zeprocks#1

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Posted 3 weeks ago

Thanks guys... I have 14x7's



#5 Injuneer

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Posted 3 weeks ago

According to Tire Rack specs for the Cooper Cobra and the BFG Radial TA, a 225/70-14 is OK on a wheel between 6.0-7.5” wide.  The Cooper 225 is 1/2” larger in diameter and less than 1/4” wider section width.


According to Tire Rack specs for the Cooper Cobra and the BFG Radial TA, a 225/70-14 is OK on a wheel between 6.0-7.5” wide.  The Cooper 225 is 1/2” larger in diameter and less than 1/4” wider section width than the 215.






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