Currently Available Goodyear or Firestone Tires for 1971

[Terry M.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Anyone have any idea how many points deduction during judging a 1971 would get if it had GR-70 RWL wide oval versus FR-70 tires? Thank you in advance for you help, knowledge, and input.

Paul
The answer is in the Standard Deduction tables of the NCRS Judging Reference Manual. I am on the road and do not have my JRM with me, but surely (If I can call you that.) someone has this rare book in their library.

[Mark E.]

Re: Currently Available Goodyear or Firestone Tires for 1971

If on a budget, consider Goodyear Integrity. I purchased a set of four size 215-70-15 three years ago from NTB for $300 including mounting, balancing, stems, tax.

Nothing fancy: S speed, 460AB, but probably better than OEM back in the day. It provides a smooth and quiet ride which responds ok if pushed a bit through corners. Can't speak to wet performance since I avoid driving the car in the rain.

This size isn't hard to find since it's used by many mid-1990s minivans.

[Paul C.]

Re: Currently Available Goodyear or Firestone Tires for 1971

How muchactual difference in handling, etc. between P 215 and P 225? Can you tell any difference--I am not racing the car--just driving it.

[Duke W.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Nothing most could detect, but the 225/70 will result in less speedometer error and look better on 8" wide wheels.

Duke

[Patrick H.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Nothing most could detect, but the 225/70 will result in less speedometer error and look better on 8" wide wheels.

Duke

It will also garner a judging deduction.

[David C.]

[Mark E.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Nothing most could detect, but the 225/70 will result in less speedometer error and look better on 8" wide wheels.

Duke

I haven't looked at this in awhile, but thought the 215 is closest to F70 in diameter.

Comparing sizes, all else equal, the narrower tire is smoother and quieter, and less likely to track with grooves in the pavement.
H

[Terry M.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Anyone have any idea how many points deduction during judging a 1971 would get if it had GR-70 RWL wide oval versus FR-70 tires? Thank you in advance for you help, knowledge, and input.

Paul,
My JRM is so rare that I can not locate it. Without it I can not quote you the percent deduction for the tires you put forth. Sorry.

[Terry M.]

Re: Currently Available Goodyear or Firestone Tires for 1971

I currently BF Goodrich T/A tires whihchave 90% of their tread left but are 15-20 years old so I am replacing them for safety reasons.

Which currectly available Goodyear or Firestone (since they originally came on the 1971 & no I don't want kelsey or coker tires) will fit the 8 inch rim and not rub the wheel wells. I wanted Goodyear Eagle GT II (no longer made) but looks like the Goodyear Wrangler SR-A(light truck & SUV) and the Firestone Destination LE (light truck) are the only tires that comes in 225 x 70R x 15---also BF Goodrich T/A. Same size but 235 yeilds the same 3 tires. I quess my question is are there any other sizes that fit the 1971 like 235 x 75R x 15 or something else? I understand why everyone who buy radial tires are running the Goodrich T/A.

Paul and I have answered his question off-line, but for those also interested in how to apply the Standard Deductions for tires here is the process:

1) Go to the applicable Technical Information Manual & Judging Guide (TIM&JG) to find the description of the OEM tires for your year car.

2) Go to the judging score sheets on this web site to find how many originality points are assigned to tires for your year Corvette:

https://www.ncrs.org/services/judging-score-sheets.php

Tires are judged in the Exterior section.

3) Paul was kind enough to supply the standard Deductions for Tires for 1953 to 1973. They are slightly different for 1974 and newer, so if that area is your interest you will have to seek that wording in the NCRS Judging Reference Manual. For 1953 to 1973:
The following is the Standard Deduction chart that is applied when judging tires for Originality:

No Originality Deduction - Four (4) matching OEM tires as described in the TIM&JG and one (1) matching, or non-matching, OEM spare tire.

Deduct 10% - Reproduction OEM brand and size tires which differ from the original only because of Federally required DOT marking.

Deduct 20% - Reproduction OEM brand, type and size tires which differ slightly from the original in design, construction, material, tread width, white (or colored) wall width, style lettering or pattern.

Deduct 30% - Reproduction OEM brand, type and size tires which differ considerably from original in design, construction, material,, tread width, white (or colored) wall width, style, lettering or pattern.

Deduct 40% - Reproduction tires of non-OEM brand having correct size and sidewall specifications.

Deduct 60% - Current-day OEM brand, service replacement size, bias or radial ply tires or current equivalent sizing designation and correct whitewall width.

Deduct 75% - As above (50% deduct criteria) except non-OEM brand.

Deduct 100% - Originality and Condition, all others or those with white (or colored) wall mounted inboard.

4) Decide how the tire you are considering falls into the above matrix and mathematically apply that percent to the available originality points from item 2. This process is for the four road wheels. The same process is used as a separate line item for the spare tire, because the spare does not need to match the road wheels. We do this even though all Corvettes were originally equipped with five matching tires because if the original spare tire is available we want to see it.

Simple? yes? This is the exact process judges use when judging your car at an NCRS meet. My thanks to Paul for the Standard deductions when I can not locate my Judging Reference Manual.

[Bill L.]

Re: Currently Available Goodyear or Firestone Tires for 1971

HI Terry,

Do you know if the new Firestone Wide Oval Radial Reproductions from Coker have been judged? Curious to see if they slip in to the 30% deduct category.


Kind Regards,


Bill

Paul and I have answered his question off-line, but for those also interested in how to apply the Standard Deductions for tires here is the process:

1) Go to the applicable Technical Information Manual & Judging Guide (TIM&JG) to find the description of the OEM tires for your year car.

2) Go to the judging score sheets on this web site to find how many originality points are assigned to tires for your year Corvette:

https://www.ncrs.org/services/judging-score-sheets.php

Tires are judged in the Exterior section.

3) Paul was kind enough to supply the standard Deductions for Tires for 1953 to 1973. They are slightly different for 1974 and newer, so if that area is your interest you will have to seek that wording in the NCRS Judging Reference Manual. For 1953 to 1973:
The following is the Standard Deduction chart that is applied when judging tires for Originality:

No Originality Deduction - Four (4) matching OEM tires as described in the TIM&JG and one (1) matching, or non-matching, OEM spare tire.

Deduct 10% - Reproduction OEM brand and size tires which differ from the original only because of Federally required DOT marking.

Deduct 20% - Reproduction OEM brand, type and size tires which differ slightly from the original in design, construction, material, tread width, white (or colored) wall width, style lettering or pattern.

Deduct 30% - Reproduction OEM brand, type and size tires which differ considerably from original in design, construction, material,, tread width, white (or colored) wall width, style, lettering or pattern.

Deduct 40% - Reproduction tires of non-OEM brand having correct size and sidewall specifications.

Deduct 60% - Current-day OEM brand, service replacement size, bias or radial ply tires or current equivalent sizing designation and correct whitewall width.

Deduct 75% - As above (50% deduct criteria) except non-OEM brand.

Deduct 100% - Originality and Condition, all others or those with white (or colored) wall mounted inboard.

4) Decide how the tire you are considering falls into the above matrix and mathematically apply that percent to the available originality points from item 2. This process is for the four road wheels. The same process is used as a separate line item for the spare tire, because the spare does not need to match the road wheels. We do this even though all Corvettes were originally equipped with five matching tires because if the original spare tire is available we want to see it.

Simple? yes? This is the exact process judges use when judging your car at an NCRS meet. My thanks to Paul for the Standard deductions when I can not locate my Judging Reference Manual.

[Allen N.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Is there a new tire available that only receives the 10% deduction?

[Terry M.]

Re: Currently Available Goodyear or Firestone Tires for 1971

HI Terry,

Do you know if the new Firestone Wide Oval Radial Reproductions from Coker have been judged? Curious to see if they slip in to the 30% deduct category.


Kind Regards,


Bill

Sorry Bill, I do not know since I don't judge any more. I teach school instead.

[Terry M.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Is there a new tire available that only receives the 10% deduction?

I am not aware of a "new" tire for early C3s (OEM F70-15) that fits that description, and I am not familiar with tires for other year groups.

[Paul C.]

Re: Currently Available Goodyear or Firestone Tires for 1971

Can people who have purchased the Coker new radial RWL Super Ovals please post what their opinions are of these tires!! Read postings on other websites (Buick) that the tires were having problems with the steel belts separating. Need some honest assesments by people who have purchased these tires. Like the looks of the tires but if they are having problems will just stick with the BFGoodrich T/A 225's and take the point deductions. Want a good performance tire since I drive the car alot.

[Mark E.]

Re: Currently Available Goodyear or Firestone Tires for 1971

It's hard to have your cake and eat it too. Tires which score well often carry a premium price and don't perform all that well. And after not very long, you'll face condition deductions for wear.

If you want to drive the car "a lot" and have it judged, tires may be one of those parts which you invest in two sets: one for show, one for driving. As posted above, an extra set of decent modern radials for driving are only $300 - $500.