UTV and ATV Tire Size Explained: Are Bigger Tires Better?

Posted on April 5, 2018 by Weekend Warrior.

When it comes to trucks, jeeps, ATV’s and UTV’s, oftentimes the first modification people make is larger tires. But why is this change made? For many it is just for the look. And for others, it is for increased performance in ground clearance and traction.

2015 Can-Am Commander XT 1000 UTV

Aesthetically, “Bigger is Better” when it comes to ATV tires and UTV tires, but how big is too big? At what point do larger tires or wheels begin to negatively affect your vehicles handling, potentially putting you into a mechanically unstable or even dangerous situation?  Stay tuned, as we discuss this topic in depth.

What Size Tires Will Fit My ATV or UTV?

Bigger tires can assuredly help you gain ground clearance and traction in sand, deep mud, snow or uneven terrain. As a general rule, most vehicles can safely handle an increase in tire size one or even two sizes larger than stock. From the factory our vehicles have been engineered to perform and behave a certain way with a specific size of wheel and tire combination. A good rule of thumb for an acceptable increase in tire size is 1 size larger for vehicles 500cc or less and up to two sizes larger for vehicles between 500cc and 1000+cc.

Stack of UTV Tires for Side by Sides

Negative Effects of Putting Bigger Tires on Your ATV or UTV

Increasing the size of your ATV tires will undoubtedly give your vehicle a much more aggressive look while increasing ground clearance and traction. However, there are some negative effects, which will most likely present themselves if not professionally addressed with quality aftermarket parts and accessories. Some of the potential issues are as follows:

  • Loss of Low End Grunt
  • Increased Clutch Wear
  • Tire Rub on Body Panels / Suspension Components
  • Increased Drive Belt Wear
  • Premature Drive Line Failure – Due to Increased Angles
  • Premature Axle Failure
  • Premature Wheel Bearing Failure
  • Increased Roll-Over Rate

Solving ATV/UTV Tire Size Issues

Now that we understand the potential side effects, let us dig into the solutions to these problems so that we can safely and successfully run those big meaty and aggressive tires.

Gear Reduction and Cutch Kits

The taller or the larger the tire that you install on your ATV / UTV, the higher the gear ratio will become. Larger tires will also be heavier and will have a larger rotating mass, which will rob low-end torque and power. Your engine will strain harder to get the wheels rolling and once at speed, you will be fine until you encounter an obstacle such as deep sand or mud, where the ability to spin the tires quickly in mud will be diminished. The solution to these issues will be a gear reduction kit or the installation of a clutch kit. These solutions are different so choose the kit which will best serve your needs.

  • Gear Reduction Kits will allow the wheels to spin faster.
  • Clutch Kits will allow the engine to rev higher before engaging.

NOTE: Please keep in mind that both of the above fixes will cause a loss in overall top speed.

Example of a Clutch Kit: EPI Sport Utility Kit

EPI is a fantastic company when it comes to helping riders get bigger tires onto their vehicles. In a conversation with EPI we were told, “Our approach here at EPI Performance is to get our hands on every ATV, UTV and Snowmobile out there. We develop our Clutch Kits by putting on the miles in sand, mud, snow and trails the way you do. It doesn't become an EPI Clutch Kit until we're satisfied with how it performs in the REAL-WORLD of riding.”

But how much will a custom clutch kit such as this cost? It’s actually pretty inexpensive. For example, at right around $300, EPI makes a clutch kit for almost every ATV allowing them to run 27” or 28” tires, take a look:

Sand TIre Spring Kit for UTVS

The EPI  Sport Utility Clutch kit will allow your ATV to enjoy these benefits:

  • Designed for 27-28" Tires
  • 0-3000' elevation
  • Our best all around use kit
  • Great for trail riding, occasional mud and sand riding, plowing and hauling
  • Makes up for the power loss and slow response of adding oversized tires
  • Better low end and midrange acceleration
  • Quicker backshift which results in crisp throttle response
  • Reduces belt slip and clutch heat

Example of a Gear Reduction Kit

A good example of a transmission gear reduction kit would be the SuperATV Transmission Gear Reduction Kit. These kits are available to fit a variety of machines and are often offered as either a 12% reduction kit or 25% reduction kit. The kits come with everything you need to reduce your gearing and gain back the torque you lost by installing larger wheels and tires. The kits aren't too expensive however they do require quite a bit of mechanical knowledge as you have to tear your transmission apart to replace the stock gears. 

Heavy Duty or Severe Duty Belts

The addition of larger tires and a hopped up clutch kit will make quick work of the OEM or stock CVT drive belt. A Heavy Duty belt, also known as a Severe Duty Belt will most likely be the next upgrade on your list. Here are the benefits of a Severe Duty Belt:

  • Made of highest quality materials
  • Deep double cog style reduces clutch heat
  • Designed for sever duty applications
  • Can handle larger tire sand aftermarket clutch kits

Drivetrain and Suspension Upgrades

The stock drivetrain and suspension components of most ATV / UTV’s are not built to withstand the extra stress that significantly oversized tires bring to the table. These added stresses will accelerate the wear and tear on these components and can lead to premature failure, failure which will most likely happen much faster than with OEM sized tires. To avoid a catastrophic failure, you may want to consider installing the following heavy duty components:

  • Axles
  • CV JointsU-Joints
  • A-Arm Busing and Repair Kits
  • Tie Rod Ends
  • Shocks
  • Wheel Bearings

Lift Kits for Large UTV Tires or ATV Tires

Lift Kits & Wheel Spacers

For most ATV / UTV drivers, the main functional reason for installing larger tires is to lift it higher for more ground clearance. With the chassis raised further from the ground, the center of gravity is also raised.  A raised center of gravity can make any ATV / UTV unstable then it was stock while going through corners or traversing sideways on hillsides. Installing a lift kit with a wider stance or a set of wheel spacers can help make your vehicle wider, placing the wheel further from the shocks, struts and exhaust for proper clearance as well as increasing vehicle stability. Lift kits and wheels spacers can also help correct the reduced turning radius caused by larger tires reducing the increased steering resistance caused by the initial tire size increase.

Increase Your UTV or ATV Tire Size Without Modifications

Larger than stock tires are badass, but if all you are looking for is a slight increase in ground clearance or appearance you can go up “just a bit” to achieve that look without the need to make any of the aforementioned modifications. The measuring tape will tell all, but generally speaking, ATV / UTV manufacturers typically leave enough space to go up at least one size and maybe two sizes in tires without the risk of rubbing on plastics, shocks or exhausts.

Muddy Tires on a 2013 Kawasaki Brute Force 750 4x4i EPS Candy Green

Have Fun & Ride Safe on All ATV/UTV Tire Sizes

We hope that this article has been beneficial in helping to understand what is needed if you want to Super Size your ATV or UTV.  If you keep it mild, fewer modifications will need to be made and you will be able to retain your OEM level of performance. If wanting to go larger than one to two tire sizes, additional modifications will be necessary to protect your vehicle from breakage and to keep your vehicle running in tip-top form.  If you have any questions, please reach out to our Customer Care team via email or call us at 909-889-2761.  Thank you for your support. Until we see you next, take care and ride / drive safe.

Comments
  • Ken Sample
    I have a 500 Polaris ATP w/27” tires on it and it’s tearing up drive belts quickly.What should i do?Clutch kit?
    • Eric Ellis
      Hi Ken, thanks for checking out our blog. Did you have belt issues before you installed the 27" tires? The larger/heavier tires would make the machine work harder as whole and could cause belt problems. A clutch kit would help in reducing belt slippage. EPI offers a variety of clutch kits.
  • LikelyYou.com
    Because of all of the issues listed above, many manufacturers do not allow you to dramatically change the tire size on your ATV without voiding the warranty. Every manufacturer and dealer is different so it is important that you check with them before making this change. If your warranty is up or if you just don t care, the choice is then up to you.
  • Carl Russell
    So i have a 2017 alterra textron 500 red
    and i bottom out and get stuck alot when riding with other friends,but for some reason no one makes a lift kit for this model
    I am thinking of just adding spacers to the shocks and then going up to 28 on my tires from 25
    Will this cause more problems then its worth
    Thanks
    Carl
    • Eric Ellis
      Ho Carl, thanks for checking out our blog post. Not too familiar with your make/model as we don't sell those. However, I wouldn't really recommend going the route you mentioned. It's not as simple as just installing spacers and calling it a day. Quad lift kits are designed to fit specific vehicles to ensure safe handling as well as maintain proper angles and clearances. have to you tried searching on message boards or facebook groups that are centered around your specific vehicle?
  • Lloyd
    just read your artical. very informative. maybe you have what i am looking for. i have a 2012 rincon. did my time in mud. now want a tire ,,light weight if possible , not aggressive ,, (although my grandkids might not agree) and RADIAL , .. sizes are 25-8-12 25-10-12 . Thankyou..appreciate your help.
  • Chris
    2017 Can Commander Max 1000 (stock)
    Currently has Bighorn 2.0 (27x11x14) in the rear and (27x9x14) in the front. I want to purchase Maxxis VIPR 29s staggered with the same factory width.

    It looks like they will fit and the VIPR isn’t super heavy even though it weighs more than the 2.0

    I have a heavy duty Maverick belt that was recently purchased. Can I add these tires without a clutch kit or a lift? Shocks are currently at the lowest setting so I have some options to adjust.

    The VIPR comes in 27 but in WV the extra tire and ground clearance would be nice.

    Thanks!!!
    • Eric Ellis
      Hi Chris, thanks for checking out our post. The 29s will most likely fit, you make have to make some adjustments or keep an eye on your weight when fully loaded. A clutch kit would help overall performance but isn't absolutely necessary. Maybe add the clutch kit down the line. Hope that helps.
  • Kaitlyn
    Hi there,
    Just curious, I have stock 26x8x14 front and 26x10x14 on the back of my 2019 sportsman 850. Have a great deal on outlaw 2 tires 29x9.5x14. I have a 2inch lift but should I get the clutch kit?
  • Andre
    Will i have issues going with 27x11x14 on the front of my 2016 polaris sportsman 850
  • Roy
    I have put 29.5 tires on my Honda 420Irs and have had to replace the back boots because of tearing. Could the tires be causing this problem?
    • Eric Ellis
      Hi Roy, thanks for reading our post. Not really sure about the 29s affecting the boots? Is this something you've had to so multiple times now with the 29" tires on the vehicle?
  • Cade Shook
    Would I have trouble putting 26 inch tires on my 05 Honda rancher 400 AT
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