Datsun Roadster Forum-311s.org

Pjackb wrote: Mon Jan 28, 2019 8:28 pm

ACote wrote: Mon Jan 28, 2019 5:35 pm

Very cool! I think the stock tire is off, I got the same 175/65r14 in accordance with Tire rack, but that's smaller than it should be.
This is a good reference. (at least matches what I was told to be stock height)
https://www.summitracing.com/parts/cok-512875/overview/

The problem I found was that for the 5.60-14 I found references from 22.96" diameter all the way up to 25.7"
I decided to use the Tirerack guideline based on reputation , If people have actually measured 5.60-14 please let me know what was the diameter and I will adjust the spreadsheet accordingly

Don't know why I didn't think of just measuring it lol.
My spare is a stock tire (I think) Toyo 5.60 S14
A little dusty from the garage, I tried my best to measure it but it bulges on the treads a little. Using 2 mixing sticks as straight as I could get them I got Just a hair under 24" Anyone know a proper way to measure this?

S Allen wrote: Mon Jan 28, 2019 9:04 pm Go for it.

S

Thanks Steve! I'll post when I'd done editing.

For measuring height, put wheel on floor against a wall, use paint stick or better yet a level across the top of the treads, measure from floor to level.
Least, that's how I would do it. YMMV

Good news...it's COLD in that attic

You could just push the tire up against a wall as mentioned and put your tape measure under it and then use your paint stick. Even if it's not exact it won't matter much because your going to have to compensate for tread ware.

Alex thanks for the measurement
here's an update version with the right size for stock
I added a few sizes including 13"s and highlighted the popular sizes people seem to be taking most of the time

And to better see it

I cleaned and updated the wheel/tire post on Page 1. Here are a few outstanding bits that could not be found:

Will's info:

Erika's info:


Dave (pebbles) I need your 15x7 VTO specs/pics
Greg Burrows I need your Cosmic specs/pics


Mods, feel free to delete/archive the posts following the initial post from page 1 to page 12.

The community should continue to post replies with their wheel specs/info, I can add it to the original post.

notoptoy wrote: Mon Jan 28, 2019 10:42 pm For measuring height, put wheel on floor against a wall, use paint stick or better yet a level across the top of the treads, measure from floor to level.
Least, that's how I would do it. YMMV

Why not just take a flexible tape measure or some sort of wire, measure the circumference and divide by pi. No need to worry about getting paint sticks or whatever perpendicular that way.

Using math would be too incredibly difficult for me! Takes me back to horror stories of grade school. But seriously, what an insanely simple idea! And who can’t remember that Pi is 3.14159265359……

All of that is great, but it doesn't consider the effective laden diameter. Radials tend to "bulge" more at the bottom reducing the effective laden diameter slightly over a similarly sized bias ply. Also, consider that different brands have different actual dimensions for the same tire size. Just food for thought.

I see what you did here mods, thanks!!!

Looks like Steve is working in the background to clean this up. Don't panic yet!

Yeah, should be all done. Original thread is here....

Alvin's Wheel Thread

Steve

S Allen wrote: Tue Jan 29, 2019 12:10 pm Yeah, should be all done. Original thread is here....

Alvin's Wheel Thread

Steve

Thank you!

Here is an updated photo with new tires. 185/65 falkens with Michael Young front springs and Bilsteins front and rear and ~ 1 inch lowering blocks in rear. 70’s appliance alloy wheels. Fronts were turned down 1/4” on a lathe to fit inside the fender wells better.

Oh yes, and if you get your wheels turned to change offset to fit better. Be sure to check those balancing weights on the inside! Mine caught and rubbed a bit on the brake line. Took a while to determine the cause of the sound