Rear tire size

[FL911]

My 1981 911SC has 225-50-VR16's on it and that is what the sticker says as well.
However, I want a little more tire height.
Has anyone put say 225-55 or 60 -16's on there rear wheels? If so can you post some pics for me.
I am getting ready to buy some new tires but do not want to spend the money until I am sure that will be the look I am wanting.

Thanks,
Frank

[80-911SC]

i have 45 series on the rear, if you do change tire profile you will be changing your final gearing have your tire shop do a circumference check vs your original tire size , this will very by rim width and brand to brand with the same tire size ,
the side profile can change by changing the tire width also, goto a good tire guy and have them run the options thru with you , you could always goto a 15 " tire and get a 75 series tire but i would caution against spirited turns due to the probability of tire rolling of the rim

[Por_sha911]

You can get the right size tire without changing your final gear by using this:
Tire size calculator
If you are wanting to fill out your wheel well, the answer is to have the ride height lowered to Euro spec.

[stlrj]

I'm running 225 60's rear. Matter of fact, I got them on all four corners, that way I can rotate them like a normal car.

For got to mention my 74 911 originally came with 185 70 15's front and rear but since I had the SC flares installed, the 225 60 16's filled the gap just fine.

Joe

[bkreigsr]

do a search on the tirerack site.
they have tech spec page for every tire that they sell, that lists, among other things, tire diameter. find the tire you have, then find one that is however many mm difference you are looking for in your new ones.
there is no industry standard for the manufacturer's listed sizes stamped into the sidewall, so there is no guarantee that your new 45 series will be 5mm less than a 50, or the 60 will be 10mm taller than a 50, especially if you are switching manufacturers.
Bill K

[H-viken]

Originally Posted by bkreigsr

do a search on the tirerack site.
they have tech spec page for every tire that they sell, that lists, among other things, tire diameter. find the tire you have, then find one that is however many mm difference you are looking for in your new ones.
there is no industry standard for the manufacturer's listed sizes stamped into the sidewall, so there is no guarantee that your new 45 series will be 5mm less than a 50, or the 60 will be 10mm taller than a 50, especially if you are switching manufacturers.
Bill K

Do not believe the side measurement is mm, but rather the sidewall as a percentage of the width of the tire.

[bkreigsr]

you are correct, as the sidewall measurement is supposed to be the aspect ratio of tread to sidewall.
I'm only pointing out that if you can find the actual diameter of the tire (tirerack) it might be a bit easier to zero in on the size you are looking for.
Bill K

[redranger]

My car has 255/50/16 on the rear (7s)...not sure why, but that's how the car came to me. Fronts have 205/55 (6s).

This weekend I will be putting 8s on the rear with 245/45/16 and moving the 7s to the front with 225/50/16. This seems to be the ideal set up for the car.

Here's a pic with the 255s on the rear.

[James Brown]

wow thoese rears look HUGE, stock (us) ride hight?

[c0metdot]

looks don't go. 10-4.

[redranger]

Originally Posted by James Brown

wow thoese rears look HUGE, stock (us) ride hight?

The ride height is stock.

[James Brown]

I think the camera angle is throwing things off, can you take a picture of the side of the car.

[rattlsnak]

Why do you want a taller tire? lower the car instead...

[HarryD]

A taller tire than stock will effectively make your gearing "taller". This means that for a given speed, your engine revs will be less. Your gas mileage will improve slightly due to the lower RPM, but when you press down the loud pedal, you will not accellerate as well. Lastly, your speedo will read lower than correct and if you are not careful, you will attact some unwanted attention by the people who like flashing lights.