Menu

Shop

Garage

Cart

Account

Products to Compare (max of 3)
X
Compare These Parts

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

Built With Speedway Motors: Josh's Story
by Joe McCollough - Posted in Videos
7/19/2021
Josh's grandpa got him hooked on hot rods and racing. This is the story of how Josh brought his old, long lost show truck back into the family.
Selecting The Best Performance Spark Plug Wires
by Jason Lubken - Posted in Tech
7/9/2021
Learn about some of the differences between factory plug wires and the improvements you'll receive with a quality set of aftermarket performance wires in our spark plug wire buyer's guide
LS Flexplates for TH350, TH400, or 700R4
by Pat Orth - Posted in Videos
6/22/2021
Pat from the Speedway Tech Team talks about our LS flexplate options for mating 4.8, 5.3, and 6.0L LS engines to TH350, TH400, and 700R4 transmissions.
Happy Father's Day from Speedway Motors
by Speedway Tech Team - Posted in News
6/17/2021
Happy Father's Day, from all the car kids at Speedway Motors.
How to Choose and Measure for a Racing Seat
by Frank Galusha - Posted in Videos
6/16/2021
Eagle Motorsports, Inc. employee Frank takes a few minutes to discuss how to properly measure for a race seat.
MSD Ignition Box: Ignition Controller Buyer's Guide
by Jason Lubken - Posted in Tech
6/15/2021
Looking for an easy performance upgrade to your ignition system? MSD's line of Ignition Control Boxes offer extreme improvements to drivability and high rpm applications. Here's a look at the differences between the 6 series line-up.
Ford AOD Transmission Kickdown Kit
by Pat Orth - Posted in Videos
6/10/2021
Speedway Motors employee Pat O. is back to talk Ford Automatic OverDrive Kickdown brackets and kits.
Automotive Fittings | IFF, IFM, AN, & NPT
by Jason Lubken - Posted in Tech
6/7/2021
What fittings should you use with your brake or fuel system? What does AN and NPT stand for? All of these questions plus more will be answered in Speedway Motors' latest article about fasteners!
Employee Rides: 1963 Impala - Jason Lubken
by Jason Lubken - Posted in Videos
5/4/2021
Jason Lubken spends his days photographing some of the greatest cars of all time. In the evenings, he and his friends have screwed together a seriously cool '63 Impala.
Speedway Motors SA2020 Lightweight Racing Helmets
by Joe McCollough - Posted in Videos
4/9/2021
These new Lightweight Racing Helmets from Speedway Motors offer some impressive features at a price any racer can afford!
Error
X
Note
X
Ok