Product Summary

110 volts Voltage, 250 watts Wattage

  • Great for grooving, cutting and siping
  • Pistol grip design can be used with or without heat
  • Seven feet of cord with 110 volt, 300 watt operation
  • Multi head siper and blades included
  • Accepts all Speedway Motors and Ideal brand heads and blades

Comes as a Kit

Key Specs

MFG. Part #91082075
BrandSpeedway Motors
Wattage250 watts

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Speedway Motors 91082075 Details

  • 250-watt heating element gets up to temp quickly
  • 110-volt operation for use with fixed power or trackside generating equipment
  • 7-foot-long detachable power cord for accessibility and to sipe without heat
  • Perfect for siping tires used in dirt motorsports
  • Pistol grip design aids in cutting stability with or without heat
  • Accepts all Speedway Motors and Ideal brand tool heads and blades
  • Multi-blade siper head with blades included
  • Depth of sipe adjustable by loosening blade screw and setting to desired depth
  • Additional tool heads and blades sold separately, only buy the size you need

Maximize Your Tire’s Traction by Adding Grooves and Sipes

If you race on dirt you know that track conditions change throughout race day and many will ask how to increase traction on tires. From a high grip surface that can be wet and slinging mud to a shiny black or even hard and dusty surface as the laps pile up and the sun goes down, tire traction can change dramatically. While there are different tire compounds you can choose from to aid in traction depending upon the track’s bite, one thing many experienced racers do is modify their dirt tires by adding grooves and sipes to the tread blocks using a heated tire grooving iron tool with a specific cutting head and blade attachment.

What is tire siping and grooving? Well, grooving is just that, cutting grooves in the tread where you are removing rubber, while siping is where you make a thin cut (like a razor blade) but no material is actually removed. These cuts can be made in various widths and directions to enhance traction and get the tire up to temperature faster but can also be used to increase a tire’s longevity by helping it run cooler too. It is all in how the tire is cut.

Learning how to cut a tire with a tire groover and sipe your own tires is a bit of a black art, but a good racer will keep a logbook of modifications and can reflect on past track conditions to see what size groove and angle worked best previously. The same goes for tire siping. Often you can lean on a fellow racer for grooving and DIY tire siping advice or reach out to the tire manufacturer for suggestions on how its tire products react to certain grooving and siping cuts. Regrooving tires that have been sanded down and brought back to life is one way to save some money in your race budget too versus buying new rubber for your race car.

Built Tough to Handle Any Tire

Grooving tires and siping tires on your dirt racer takes some effort, but our tire groover tool is built to take it. We start off with a quick-heating element that is ready in just minutes and house it in a tough chrome plated barrel with chrome plated steel tip.

Our fiberglass reinforced polymer handle keeps your hands safe from the extreme heat found at the head of the cutting tool. Then we add in a fully grounded UL-listed 18-AWG power cord that is a generous 7-feet in length and detachable from the tool if you wish to cold-sipe your tires.

Our tire cutting tool is designed to work with all Speedway Motors tire grooving iron heads and blades, as well as the heads and blades from the Ideal Heated Knives brand that we carry. A single 4mm Allen head set screw (wrench not included) makes tool head changes quick and simple. Using the multi-blade siper head instantly turns our tire groover into a tire siping tool that makes quick work of your tread blocks.

Grooving and Siping Your Tires Could not be Easier

We carry a full lineup of cutting blades and heads (the heads and blades must match in size and used together) for our tire grooving iron. You will install the appropriate size head into the tool first, followed by the matching cutting blade. Set the depth of your blade before plugging the iron in and it gets hot. Generally, you will want your sipes to be 1/8-inch to 3/16-inch in depth and no more than 1/2 the depth of the tread block.

Most racers will find having more sipes on the front tires and less on the rear is the best combination. Sipe spacing is also determined by the size cutting blades used, with the further apart the sipes the cooler the tire will run. When cutting your grooves, you want them to be at full depth. Width of the grooves and direction will vary depending upon track conditions and whether you are grooving a front or rear tire (rear tires are usually grooved straight across and front tires are grooved at a slight angle to improve forward bite and warm the tire more quickly).

Make the Move and Start Improving Your Tire’s Traction Today

While grooving your tires takes some trial and error and an ability to read a track surface, in the end, grooving and tire siping dirt track racing tires with additional grooves and sipes is just another tool in a racer’s toolbox of tricks and tips to help them get to the front of the pack and stay there until the checkered flag drops. It does not matter if you are racing a Late Model or Sprint Car, doing some competitive rock crawling, rally racing, or even mud drags, modifying your tires with our tire grooving iron is sure to benefit your racing program by providing the ideal tire, making your tires grip the surface better and put just the right amount of heat into them.


Sanctioning bodies that allow tire grooving/siping (in specific classes) include IMCA, Wissota, USRA, USMTS, UMP




Speedway Motors 91082075 Specifications

MFG. Part #91082075
BrandSpeedway Motors
Wattage250 watts
Voltage110 volts
Sold in QuantityKit
NotesIncludes six-blade siping head and blades