Help is just a click away!
Click here to chat with a Speedway Team Member
💬
Online - Chat with us!
Chat
$20 off $299 | $40 off $599 | $60 off $899 | $80 off $1199      Promo: AUGUST    Expires: 8/9/20
$20 off $299 | $40 off $599 | $60 off $899 | $80 off $1199
Promo: AUGUST    Expires: 8/9/20
Products to Compare (max of 3)
X
Compare These Parts
Talk to the Experts. Call 800.979.0122, 7am-10pm, everyday.
Since 1952
in
in
Talk to the Experts. Call 800.979.0122
Shop By
Support
Account
Street Race Truck More... The Toolbox

Speedway Tech Talk - Wheel & Tire Selection Basics

3/9/2017
Tags: Videos

Speedway Motors employee Steve talks about a few options available at Speedway Motors to help take some of the mystery out of finding the right wheel and tire combination to fit your project.

The first tool Steve talks about is the Percy’s Wheelrite. This is a fully adjustable tool that fits over the lug-nuts of your vehicle. Then you can rotate your hubs and set your tire section width, and wheel diameter. It has a hoop across the top to show for any fitment and clearance issues, which can come in handy on the front axle as you can now check for contact points on your fenders without having to actually have a wheel and tire on the vehicle.

The next piece of equipment Steve talks about is the Speedway Motors Bolt Circle Template. The template is preset with multiple bolt patterns. It is simply a matter of matching up the pattern to the lug nuts or bolt-holes and you have the pattern of the wheels. That cuts out trying to measure the wheels or hubs.

Steve also shows us how to find the backspace of wheels. This is accomplished by laying a straight edge across the back of the wheel and then measuring down to the back face of the wheels. The wheel Steve uses in the video shows a total of 4 inches of backspace.

Steve also discusses the overall caliper measurement, and how to arrive at it. Essentially, the internal diameter minus 1/2-3/4 of an inch is needed for the caliper rotation. The E/T wheel that Steve has on the bench measures 14 inches internally, so that would leave a minimum of 13-1/2 inches of rotating area needed for safe operation.

He also takes some time to discuss section widths of tires. Steve says that it is not uncommon to have two tires of the same size from different manufacturers that actually have different section widths. The section width of a tire is the outside to outside measurement. The two tires that Steve has for us on the bench today are both 8.20-15 in size. One measures a section width of 9-1/2 inches, and the other one measures 8-3/4 inches. Where this matters is tucking these wheels up under a fender, or if your project may have some excessive body roll or softer sidewall in the tires, the width could result in rubbing and contact. Steve recommends 1/2 to one inch of clearance between the sidewall and the metal of your car.

Products Featured in this Article

Related Articles

2020 Customer Appreciation Week
7/16/2020
Your passion keeps our hobby and the automotive industry moving forward and thriving. And we wouldn't be here without your dedication to your craft. From all of us at Speedway Motors - Thank you!
1930 Ford Model A - Employee Rides: Joe McCollough
by Joe McCollough - Posted in Videos
7/13/2020
Joe McCollough spends his days working in the Speedway Motors Marketing department, but his nights are spent in the garage, piecing together this Model A hot rod.
1964 Chevy Impala - Employee Rides: Pat Orth
by Pat Orth - Posted in News
6/18/2020
When Pat Orth isn't offering help and technical support on the phone at Speedway Motors, he's driving around in his clean, LS powered '64 Impala.
EMI Feature-Brian Schnee
by Joe McCollough - Posted in Videos
6/8/2020
Brian Schnee has been building sprint cars for a long time, and we're honored to work alongside him every day.
Shop Tours
by Joe McCollough - Posted in News
5/4/2020
Like a lot of you, we're spending more time working on our projects at home these days. Join us for a video tour of a few of our home workshops and garages!
How to Use an Oil Filter Cutter
5/4/2020
Learn how to use Speedway Motors' Oil Filter Opener to open your filter and inspect how your the health of your motor.
How to Use Our 37 Degree Flaring Tool- Tech Talk
5/4/2020
Follow this step-by-step guide to learn how to use Speedway Motors 37 Degree Flaring Tool.
How to Assemble Our Ford 9 inch/8 inch Disc Brake Conversion Kits-Tech Talk
4/27/2020
Learn how to assemble one of our bolt on nine-inch Ford disc brake kits in this step-by-step guide.
The Zausner Speedway Special '32 Ford Roadster
by Joe McCollough - Posted in News
4/17/2020
This stunning collaboration between Eric Zausner and legendary builder Steve Moal will stop you in your tracks with its blown Ardun powerplant and never-ending list of cool details.
What is ZDDP - Benefits of Zinc in Oil
4/13/2020
Motor oil composition has changed. The reduction of ZDDP, zinc in oil, could now spell disaster for your engine. Watch this video to learn about ZDDP additives.
Error
X
Note
X
Ok