Tires C4

[Frank K.]

Home bound were do I find rear 285-40ZR17 (two) new?

[Joe L.]

Re: Tires C4

Home bound were do I find rear 285-40ZR17 (two) new?

Frank-------


It depends just what 285-40-17 you want. If it's ANY tire of that size, you've got no problem. Goodyear still makes one tire model in that size. It's the GS-D3. However, it's got a tread design radically different from the original tires. Other manufacturers also make this tire size, some with tread designs more akin to the original.

However, if what you want is the original Goodyear GS-C tires, that's another story entirely. This size is long-since discontinued and not currently reproduced. So, about your only source is going to be eBay or similar from someone who has an NOS set for sale (likely for BIG $$$$).

[Joe L.]

Re: Tires C4

Frank------


Here you go:

http://www.ebay.com/itm/2-New-285-40-17-Goodyear-Eagle-GS-C-Right-Left-Side-Tires-/381256535368?hash=item58c4a90d48&vxp=mtr

Actually, this is not a bad price. It's not that much more than you would have paid Goodyear if they were still available from them.

[Frank K.]

Re: Tires C4

Thanks for the lead! If I could just find the two for the front. I can locate Eagle F1-GSD3 but tread pattern does not match originals. Can I just for cruising just use the eagle F1 255-45zr17 on all four rims? I have the factory tires with 16,000 miles with no cracks but for long runs I do not want to use.

[Joe L.]

Re: Tires C4

Thanks for the lead! If I could just find the two for the front. I can locate Eagle F1-GSD3 but tread pattern does not match originals. Can I just for cruising just use the eagle F1 255-45zr17 on all four rims? I have the factory tires with 16,000 miles with no cracks but for long runs I do not want to use.

Frank-----

I don't think so. The rear wheels on your car are wider than the fronts. So, I don't think the narrower 255 tires will work well.

You have another option, though: Obtain a 4 wheel set of 1991-92 standard Corvette wheels or 1993-95 Z-07 wheels (the latter would be best to exactly match your original wheel configuration but you'll probably never be able to find any). Then, buy a set of FOUR Goodyear F1 Asymmetric tires in size 275-40-17. Mount them on the wheels and you're all set. You can then keep the original tires and wheels together for future use.

[Frank K.]

Re: Tires C4

Thanks for the info. I will look for 92 rims a setoff four and mount four of the same size. I will keep the original tires and use for ncrs judgeing in the future

[David H.]

Re: Tires C4

Thanks for the info. I will look for 92 rims a setoff four and mount four of the same size. I will keep the original tires and use for ncrs judgeing in the future

BEFORE you purchase the same (all four sides) size tires/wheels check to see if it will interfere with the ABS/TCS system on your car.

I believe traction control became standard in 1992. I know when the C-5 first came out and folks tried to mount same size wheels all around, the ECM limited the car to about 55 mph MAXIMUM. What happens is TCS expects to see different wheel rotation speeds front-to-back as the rear wheels have a greater diameter than the fronts. With the same diameter wheel/tire all around, the TCS interprets this as WHEEL SPIN and limits engine performance.

[Frank K.]

Re: Tires C4

The ZO7 option in 1993 had the same tire size. Rims were 9.5 verses the 8.5 I have on my front. I was just going to a all around 8.5 rim (1992 style) You believe the ECM will react to a tire spin at 55. Is the ZO7 option computer flashed differently?

[David H.]

Re: Tires C4

The ZO7 option in 1993 had the same tire size. Rims were 9.5 verses the 8.5 I have on my front. I was just going to a all around 8.5 rim (1992 style) You believe the ECM will react to a tire spin at 55. Is the ZO7 option computer flashed differently?

You addressed my question with your comment on Z07 wheel sizes. To your question,

My point is not that the ECM would react to a tire spin at 55 mph. On the C-5 the ECM accepts a certain amount of wheel spin. When wheel spin is implied by faster than expected differential (front-to-back) wheel speeds, the C-5 limits engine performance. That limitation shows up as the car has a maximum speed of around 55 mph.

[Joe L.]

Re: Tires C4

The ZO7 option in 1993 had the same tire size. Rims were 9.5 verses the 8.5 I have on my front. I was just going to a all around 8.5 rim (1992 style) You believe the ECM will react to a tire spin at 55. Is the ZO7 option computer flashed differently?

Frank-------

For any given 91-95 year, the ECM's were the same for non-Z-07 and Z-07.