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Username Post: 69 Chevelle max rear tire height        (Topic#354669)
Posts: 3

Reg: 12-31-18
01-01-19 10:40 AM - Post#2756251    

Would like to get my rpm down on the highway by adding taller tires to the rear. 4-speed with 3.31 gears and 14" original tires. Willing to put 15s or 16s on.
Any suggestions?


"10th Year" Gold Supporting Member
Posts: 417
Loc: Oakland Co., Michigan
Reg: 10-12-08
01-01-19 12:27 PM - Post#2756265    
    In response to 69VelleSS

First, you should have posted this in the Chevelle section.

There are a lot of Gear/Tire/RPM calculators available all over the internet.

I Don't know about 69's, but a lot of posts about 70-72's seem to indicate that about a 30" tire diameter is about max (295/65R15 - and that IS a big tire).

Assuming your current tires are about 26" diameter and going from a 26" to a 30" diameter would drop your 3:31 to an equivalent of a 2:87 ratio.

Wheel diameters are irrelevant, the only thing that matters is overall tire diameter.

Posts: 3

Reg: 12-31-18
01-02-19 12:59 PM - Post#2756356    
    In response to sz0k30

Appreciate the info and help.
I'll try to get the right section next time.

"10th Year" Silver Supporting Member
Posts: 4751
Loc: SoCal
Reg: 12-21-01
01-02-19 05:37 PM - Post#2756386    
    In response to 69VelleSS

Welcome to ChevyTalk, 69VelleSS!

    1967 Chevrolet Impala SS convertible 327 - Ermine White C1 - VCCA Senior Award
    1967 Chevrolet Impala SS Sport Coupe 396 - Marina Blue FF - personal "barn-find" lol


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