DomsZ28

I have a 95 Z28 with the 235-55-16 stock size tires. I CANNOT find anything for this size tire...Is there an alternate size I can use? Thanks

DomsZ28

Would 245/50R16 sized tires work OK? Id like to go a bit wider in the rear fir better traction. Also how much would a different size affect speedo?

Injuneer

Tire Rack offers three different tires in 235/55-16:

General Altimax HP (Grand Touring All-Season) - $127

BFGoodrich Traction T/A T (Standard Touring All-Season) - $124

Kumho Solus KH16 (Grand Touring All-Season) - $122

A 235/55-16 is a 26.1 to 26.2" diameter tire. The 245/50-16 was an option on the 4th Gen's, with the RPO "QLC" Z-rated tire option. The 245/50-16 is a 25.7" tire.

When you go to a smaller diameter tire, the speedometer indicates a speed higher than actual speed, and the odometer adds extra miles beyond those actually driven. In this case, the speedometer will read 2% higher than actual speed (e.g. - indicated 61.2 MPH at a true 60 MPH), and when you have driven 1,000 miles, the odometer will indicate you have racked up 1,020 miles.

You can have the correct tire diameter programmed into the PCM (computer) to eliminate the error. You could have this done by a dealer, a mail-order programmer, or by picking up a used Hypertech Power Programmer and doing it yourself. By careful with the used Hypertech - if the original owner did not return his PCM to stock tune with the programmer, it can not be used on another vehicle.

DomsZ28

Thank you Injuneer. Im just looking for a size that has more "affordable" options. I wanted a tire that would be similar to the stock size(235-55-16) but had a wider variety of options. I was just wondering what would be a good size to go with??If anything Id like to go a little bigger, not smaller. Could you, or anyone else, recommend a good size that wouldn't throw the speedo off a bunch and mess things up? Thank you!

DomsZ28

what do you think of 235-60-16? Also, should I go larger in the rear and smaller size in the front? Or all 4 tires the same...?

Injuneer

There's not much choice with 16" wheels. That's why a lot of people move up to 17" wheels. I can't see any advantage in going to a 27.1" tire (235/60-16). It will fill up the wheel wells better, but it will also lift the back another 1/2" off the ground. My car has a huge rake (28.1" rear/26.0" front) with full slicks in the back and skinnies in the front, but IMHO that's OK for the track, but not for the street. I run tires with the same 25.7" diameter front (275/40-17) and rear (315/35-17) on the street.

DomsZ28

hmmmm. Thank you Injuneer. I just thought 235-60-16 would be close to stock size so it wouldnt mess up the speedo that much.

Injuneer

235/50-16 = 26.1" (or 26.2" - depends on manufacturer)

235/60-16 = 27.1" (or 27.2" - depends on manufacturer)

Speedo error 3.7% slower than true speed.

ToocoolZ28

My 95 Z28 came stock with 245/50/16s, They are pretty easy to find and look OK on the car. Give them a try