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60 series vs 70 series Goodyear Polyglas tires #2616981 02/04/19 07:12 PM 02/04/19 07:12 PM
Joined: Jul 2015 Posts: 180 Bradford, Ontario B Barrelhouse OP member
Barrelhouse OP member B Joined: Jul 2015 Posts: 180 Bradford, Ontario	What's the difference between the 60s and 70s tires ?, is it the over all tire width ,tread width , or height ?.

Re: 60 series vs 70 series Goodyear Polyglas tires [Re: Barrelhouse] #2616984 02/04/19 07:18 PM 02/04/19 07:18 PM
Joined: Feb 2012 Posts: 4,454 Morristown Tn. 7 71birdJ68 master
71birdJ68 master 7 Joined: Feb 2012 Posts: 4,454 Morristown Tn.	60 series is sidewall is 60% of the tread width, same with 70%. Same as modern tires.

Re: 60 series vs 70 series Goodyear Polyglas tires [Re: Barrelhouse] #2616998 02/04/19 07:47 PM 02/04/19 07:47 PM
Joined: Jan 2003 Posts: 20,818 A collage of whims topside Too Many Posts
topside Too Many Posts Joined: Jan 2003 Posts: 20,818 A collage of whims	It's called "aspect ratio"; the ratio of sidewall height to tread width, as described above.

Re: 60 series vs 70 series Goodyear Polyglas tires [Re: topside] #2617010 02/04/19 08:23 PM 02/04/19 08:23 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	The shorter sidewall cuts tire flex on turning. I seem to remember the 70s on performance cars on 14s and the super performance cars got 60 series tires on 15s. R.

Re: 60 series vs 70 series Goodyear Polyglas tires [Re: Barrelhouse] #2617030 02/04/19 09:15 PM 02/04/19 09:15 PM
Joined: Jan 2003 Posts: 10,589 Freeport IL USA poorboy I Live Here
poorboy I Live Here Joined: Jan 2003 Posts: 10,589 Freeport IL USA	According to the chart I just googled, a G60 15 has a diameter of 26.46" and a G70 15 has a diameter of 27.46". Different letter sizes have different height differences, and then you need to take in the wheel diameter that also changes the differences. As I remember from back in the day, an F70 14 had about the same height as a G60 15, but that was a long time ago. Gene

Re: 60 series vs 70 series Goodyear Polyglas tires [Re: poorboy] #2617315 02/05/19 02:45 PM 02/05/19 02:45 PM
Joined: Sep 2003 Posts: 19,480 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,480 north of coder	the only thing wrong with using published dimensions, is the difference between tire manufacturers of a particular size can vary up to an inch. i have witnessed and measured this countless times over the years. also, keep in mind the difference between a "loaded" dimension vs an "unloaded" one.

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