By Mike Garrison
Axial Racing Blog Update:
Tire Cutting 101
When it comes to scale trail runs, mud bogging, competition crawling and racing, tires are one of the most important aspects of your vehicle. Without proper traction it can be tough to hold your intended line in the rocks or around the track. Having multiple sets of tires in your arsenal is always a good idea in order to be prepared for any and all conditions. But, for the budget crawler, basher and racer having numerous sets of tires and wheels isn’t always a feasible option. There are ways to improve your existing tires and wheels though, and all it requires is a little time at the work bench. For this tire cutting article we will show you a few ways to get more traction out of your stock or existing tires, with little to no money out of your pocket. There are numerous ways to cut tires for better performance. Siping, read cutting, tires is a technology used in the 1:1 off-road world for everything from rock crawling to baja, mud bogging and even full size monster trucks. Tire cutting can be used to get better forward bite, better lateral bite, and even help to avoid mud from packing into certain tread patterns. You can also cut the side wall lugs to soften up the overall feel of the tires carcass as well. There are many aspects to this technology/art form.
A good example to start with for the scale crawlers is the stock R40 compound Axial Ripsaw tires that are original equipment on the RTR Wraith and new RTR Ridgecrest. These tires have a great tread pattern with aggressive lugs for hardcore off road terrain. But, the compound on these is quite a bit harder than the softer R35 Axial Ripsaw tires. Here are a few different methods you can use to get the most out of your stock RTR Ripsaw tires. Only tools needed are a good pair of small wire cutters, a Dremel with a cutoff wheel and a little bit of your time.
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Wire cutters used.
Dremel and cutoff wheel used.
A stock uncut tire before we get started.
First thing I wanted to improve upon was forward bite, and the ability to clean sticky mud out of the tire lugs. The tires I am using for this article will be bolted up to a 2.2 scaler/rock racer which will see a wide variety of terrain. I started by cutting the smaller rows of lugs completely out of the tires for a super aggressive tread pattern that will have the ability to shed mud and wet dirt, using a small pair of wire cutters. This cut will also soften the carcass up and allow for more forward bite in technical rock sections, similar to airing a 1:1 tire down for more grip and better ride. If your wire cutters are too small to span the entire lug you are trying to remove, you can cut half of the lug and slide the cutters along the base of the lug for a second cut as needed. I had to use this method on the biggest lugs.
Next cut the smaller center lugs out on the same row.
Here is how that same tire looks when the first round of cutting is complete.
A profile shot after the first round with the wire cutters.
A photo of all the lugs removed from the 4 tires.
Next I want to improve the tires performance on the rocks in off camber situations. To do this I will use my Dremel and cut the existing tire grooves in the center lugs down to the tire's carcass. Here you can see it grooves before I modify them.
Position the Dremel over the lug to be cut and follow the existing groove to make it deeper.
Keep your RPMs on the Dremel high enough to cut the lug without bogging the motor down. Gently apply pressure until the cutoff wheel cuts the full depth of the lug. Be careful not to go too deep and cut all the way through the tire, take your time and be patient. You can also do this to the outer lugs if you find you need more bite, or sidewall flex. Another way to get more flex out of your tires is to open up the breather holes in the wheels. I drilled out the existing breather holes in these wheels to twice the stock diameter.
Here’s a few shots to show the overall look on my “Project Backyard Basher Ridgecrest.” These tires really give it a lot more aggressive look, similar to what you would see on the “Rock Bouncers” from down in the southeast.
Following these tips will improve overall performance on the stock RTR Ripsaw tires as well as other tires on the market, especially if they are molded in a firm rubber compound.