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Dirt Wheels

Yamaha Race Debuts R1DT Prototypes

Yamaha recently announced that it would be debuting the new R1 DT cars on the track. The R1 DT concept calls for Yamaha to build track-ready production oval and circle track race cars. Yamaha is still exploring options before committing to production. It is working with race organizations to ensure that they will be a class structure. It is hard to sell race cars that can't be raced. At the moment eight of the striking little racers exist, and Yamaha invited eight drivers to race the machines to see how the class…

HOW TO: USE A BEADLOCK WHEEL

-- THE RIGHT WAY -- Beadlock wheels not only look trick, they serve a purpose. To get maximum traction out of your tires, beadlocks allow you to run lower air pressures without the risk of a tire rolling off its wheel. High-horsepower drag quads may also need the beadlocking protection to keep tires from spinning on the wheels after the clutch is dumped. We have seen it happen. In the event you do get a flat tire from a puncture, a beadlock will hold your tire onto the wheel, ultimately letting you finish a trail ride…

TOP PROJECT ATVs

The Dirt Wheels crew will ride a box-stock quad for awhile, but then we start thinking about ways to improve its performance. Building project quads is a way of life for us. Here is a list of some that made it into the Dirt Wheels Project Quad Hall of Fame. Click on the links above each picture to go straight to the articles. PROJECT HONDA TRX400EX BUDGET BUILD PROJECT HONDA ATC 250R REBUILD PROJECT RAT ROD QUAD PROJECT RACE WALSHZILLA VS. CRF450R PROJECT HONDA TRX450R SAND SLINGER PROJECT DUNCAN SUZUKI…

HOW-TO: Install an ATV Axle

During the making of our project Raptor 734 we gathered parts to widen it up and beef up the suspension. Part of matching the longer Houser A-arm setup is a wider racing axle, like the one we got from Tusk for under $200. The $196.95 axle is adjustable from 2 3/8 inches wider to 4 3/8 inches wider than stock, depending on which spacers you use for the hubs. This particular axle requires a 70mm and 46mm axle nut wrench, or a giant crescent if you have it, so make sure you have all of your tools ready beforehand! So, let’s…

TUESDAY TREAD: STI Outback Max Mud Tire

When you think of a description of a mud tire, the word “smooth” probably doesn’t come to mind. However, that was the first word that popped into our driver’s head when he first tested a machine equipped with STI’s new Outback Max mud tire. This huge tire has an aggressive V-shaped pattern with stepped lugs measuring 1.5 inches tall in the center. From there, the lugs stretch and grow to the outside and end up being a full 2 inches tall. The outer lugs are an angled, cupped design. There is a little side bite, but most of…

TUESDAY TREAD: RP Advanced Delta FX Sand Tire

In the January 2015 issue, right before the start of the winter dune season, we featured a buyer’s guide for UTV sand tires. One brand and style that stood out the most was the military-spec RP Advanced Delta FX Dune tire. This tire package included paddles on all four tires instead of just in the rear. It makes sense to use tires like this now that every UTV is fourwheel drive. Originally, the tire was developed for Special Forces operations in sandy parts of the world where the light tactical vehicles were used.…

PRODUCT TEST: HMF U4 Winch Bumper

Accenting your ATV or UTV usually comes after a search for style or out of necessity. With the Polaris RZRs, the front chassis area is so compact, it’s nearly impossible to install a winch or even a winch mounting plate. So when we looked into adding a winch to our project RZR XP 4 1000, we needed a dual-purpose bumper to help us out. There are a lot of bumper options out there—from ones that incorporate LED lights or light tabs to ones that help hold sway bars— but very few hold winches. Warn, the leading winch-maker, EMP…

TUESDAY TREAD: AMS Radial Pro UTV Tires

Eventually, everyone will want new tires on their UTVs, and when they do, there is always the question of, which ones do I buy? A lot of factors come into play when choosing the right tires to better suit your driving style and terrain. Recently, we tested a set of the AMS Radial Pro on an Arctic Cat Wildcat Sport 700. We decided to mount the front 26x9R12 and rear 26x11R12 tires on the stock rims. The Radial Pro is a DOT-approved, eight-ply, directional tire with staggered V-shaped lugs in the center and…

PROJECT RAPTOR 734 GETS 76 HP!

We like to cover the spectrum of affordability with our projects. Some, like our Honda 400X, are affordable, easy and very effective. For our project Raptor, however, we decided to not constrain the project with a budget but rather shoot for the stars. With the Raptor in pieces in Trinity’s shop, we compiled some other parts to install for part one of the project Raptor build. If you’ve been keeping up with our Facebook page at www.facebook.com/dirtwheelsmag, you will recall some of the build pictures and…

PROJECT ATV: Duncan YFZ450R

Over the years we have tested many fully built machines that we have given rave reviews over and some we haven’t liked much at all. Since the new sport ATV world is stagnant at the moment, we have been building plenty of older machines that prove that they are still very worthy of competing. Our last build with Golden West Cycle and Duncan Racing turned out very well. The WORCS-style Honda 450R we built was great on the track, trail and in the dunes. Afterwards, we contacted Duncan to build us a full MX-style YFZ450R with…