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17" tire size help 1970 442

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Old Jun 7, 2018 | 11:48 AM
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17" tire size help 1970 442

Hi,

I want to store my 14's with Repro G70-14 belted and get a set of radial tires to drive every day. Keep the SS1's for show duty. If I was going to do this, I wasn't going to get 15's because they are going the way of 14's with so few available.
I ordered a set of 17x7 & 17x8 with +0 offset. I want to keep as close to the same height tire as I have now, since I want a little sidewall. Coker lists my current tire at 26.8".

I was looking at a 225/50-17 on front & a 255/45/17 rear. Both are within an inch of what I have now.

Any other suggestions on sizes that will work with the rims selected?

Another thing is I have a new repro ILT exhaust system that I don't want to start tampering with Any input is greatly appreciated

https://www.tirebuyer.com/tires/cont...19002771#specs
Old Jun 7, 2018 | 01:15 PM
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From: Gillespie County, Republic of Texas
Originally Posted by droptopron
...I was looking at a 225/50-17 on front & a 255/45/17 rear...
Hi Ron.

The 255/45-17 has a load capacity nearly identical to what the factory installed on your car.

The 225/50-17 has about 10% less load capacity.

Given that most of the weight is over the front wheels and that the factory was't in the habit of wasting money on oversize tires, I'd say you need to match up load capacity when you select the front tires.
Old Jun 7, 2018 | 01:36 PM
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Good thinking. I didn't consider that. I'll keep an eye on that.
Old Jun 8, 2018 | 06:07 AM
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G70-14s are about 26.8" in diameter. Both 17" tires you are looking at are about an inch smaller in diameter - and this doesn't account for the fact that radial sidewalls deflect more than do those of bias ply tires, so the effective rolling radius will be even smaller.
Old Jun 8, 2018 | 05:37 PM
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Originally Posted by joe_padavano
G70-14s are about 26.8" in diameter. Both 17" tires you are looking at are about an inch smaller in diameter - and this doesn't account for the fact that radial sidewalls deflect more than do those of bias ply tires, so the effective rolling radius will be even smaller.
Hmmm valid point I didn't consider. I found a tire that is offered in a 235/55 & a 255/50. They are 27" tall. I hate to go with a tire from Indonesia but at least they are all season.


https://www.tirerack.com/tires/tires...omCompare1=yes

Height wise that lines up with a 255/60-15. They fit pretty well.

https://www.tirerack.com/tires/tires...omCompare1=yes
Old Jan 18, 2024 | 07:03 AM
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14" tires


G70x14 tires
I replaced some BFGs 225x70x14s for these G70x14" Wide Ovals
I would stick with 14" or 15" for that original look. 17" tires just don't have enough sidewall in my opinion.

Last edited by 442 KO; Jan 18, 2024 at 07:11 AM. Reason: size
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