Lauren HollandBy Lauren Holland

Updated November 2026

The best base-model side-by-sides with optional upgrades are the machines that give you a solid, reliable platform at a reasonable starting point, then let you add the features you actually need over time. This guide walks you through how to evaluate a base model, decide which upgrades matter for your riding, and build a sensible plan so you end up with a machine that fits your trails instead of one stuffed with accessories you never use.

Why Start With a Base Model?

A base-model side-by-side gives you the core components that define how the vehicle performs: the engine, drivetrain, suspension, brakes and frame. Those are the parts that are hard or expensive to change later. Accessories like light bars, winches, roof systems and seat upgrades are comparatively easy to add. Starting from a stripped-down or standard trim lets you put your money where it counts and avoid paying for cosmetic or convenience features that you may replace anyway.

Shopping for one? See our guide: 5 Best Razor Side by Side 2 Seater Models (2026): Expert Picks.

Owners often report that the best long-term setups begin with a machine whose engine and suspension match their terrain, not one with the longest feature list on the spec sheet.

Six Factors to Check Before You Buy

1. Engine Size and Power Delivery

Engine displacement is only part of the story. Look at how the manufacturer describes the power band and whether the engine uses electronic fuel injection, a variable-speed transmission or a CVT. Trail riders who spend most of their time on tight, technical terrain usually value low-end torque more than peak horsepower. Sand and dune riders often want a machine that holds its power at higher RPM.

2. Drivetrain and Transmission Type

Check whether the base model offers two-wheel or four-wheel drive, whether it has a locking differential, and how the transmission shifts. A CVT is generally easier for new drivers and for stop-and-go work. A manual or sequential gearbox gives more control on steep climbs and hill descents. Confirm whether the trim you are considering includes a front differential, since that affects traction on muddy or loose surfaces.

3. Suspension Travel and Ground Clearance

Manufacturers publish suspension travel and ground clearance figures for each model. Compare them directly. More travel helps over rough ground, while higher ground clearance reduces the risk of hitting the underbody on rocks and ruts. Pay attention to whether the base suspension is adjustable. Preload-adjustable shocks are a common and useful feature, and they are often easier to add later than a complete suspension swap.

4. Brakes, Tires and Wheels

Brake systems vary between trims, and some base models use smaller rotors or single-piston calipers. If you ride heavily loaded, at speed or in steep terrain, verify the brake specification carefully. Tires are one of the most impactful upgrades you can make, so note the stock tire size and tread pattern. Many riders replace stock tires with a more aggressive or better-suited set within the first season.

5. Cargo Capacity, Towing and Seating

Check the rated payload and towing capacity in the owner’s manual, not only on the brochure. A base model may have a smaller cargo bed or a different hitch rating than the upgraded version. Count the seats you need and confirm whether the base model includes seatbelts, grab handles and passenger footwells designed for the number of occupants you plan to carry.

6. Serviceability and Parts Availability

Look at how easy routine maintenance is. Oil and filter access, air filter location, spark plug access and coolant service points all affect how much time you spend in the garage. Also check how widely parts are stocked for the model you are considering. A machine with a large dealer network and broad aftermarket support is usually easier to keep running.

Deciding Which Upgrades Are Worth Adding

Once you have a base model that fits your terrain and payload needs, the next step is choosing upgrades. A useful way to sort them is by function. Upgrades that improve safety or reliability should come first, followed by those that improve traction and comfort, and finally those that are purely cosmetic or convenience items.

  1. Safety upgrades: seatbelts with harnesses, a roll cage or roll bar, properly rated mirrors, and a quality horn and lighting system.
  2. Traction and tire upgrades: a set of tires matched to your typical terrain, plus wheel size changes if the manufacturer approves them.
  3. Suspension and handling: preload or damping adjustments, sway bars and steering components if you ride aggressively.
  4. Protection: skid plates, A-arm guards and radiator guards for rock and brush riding.
  5. Convenience and comfort: seats, roof systems, storage and accessory mounts.

Upgrade Priority Table

Riding Style First Upgrade to Consider Second Upgrade Lower Priority
Trail and recreational Tires matched to terrain Skid plates and guards Cosmetic body parts
Mud and hunting Aggressive mud tires Winch and mounts Upgraded stereo
Work and utility Cargo bed or rack Towing hitch rating Lighting packages
Sand and dunes Suspension tuning Wider tires Roof systems

Building a Phased Upgrade Plan

Spreading upgrades across several months or seasons lets you learn how the machine behaves on your trails before you commit to changes. A practical sequence looks like this:

  1. Ride the stock setup for at least several weekends to note where it struggles.
  2. Address safety items immediately, including restraints, lighting and mirrors.
  3. Replace or upgrade tires once you know your typical surfaces.
  4. Add protection and suspension adjustments based on the obstacles you actually encounter.
  5. Save convenience and cosmetic upgrades for last.

Common Mistakes

  • Buying the top trim for features you will never use, then leaving the machine stock for years.
  • Overlooking payload ratings when adding racks, winches and passengers together.
  • Installing oversized tires without checking gearing, brake clearance and fender clearance.
  • Skipping a post-purchase check of torque on suspension and steering fasteners.
  • Adding a winch or heavy bumper without upgrading the frame mounts or verifying the vehicle’s weight rating.
  • Ignoring the owner’s manual on modifications that can affect warranty coverage.

Tips for Getting the Most From a Base Model

  • Compare two or three base models side by side on the spec sheet before visiting a dealer.
  • Ask about dealer-installed packages, since some upgrades are easier to install at purchase.
  • Keep receipts and part numbers for every upgrade so resale and insurance paperwork stays clean.
  • Check local trail rules for tire, sound and equipment requirements before you install parts.
  • Set a maintenance schedule right away, especially for drivetrain and brake service after upgrades.

Several accessories help riders get more out of a base model, especially when it comes to protection and safety on the trail.

  • Seatbelt harness kit: A four-point harness improves driver and passenger retention on rough terrain and is one of the most practical early upgrades. View on Amazon
  • Skid plate set: Protects the engine case and drivetrain components from rock strikes on technical trails. View on Amazon
  • Tire deflator: Allows you to adjust tire pressure on the trail for better traction in sand, mud and rock. View on Amazon
  • Recovery strap kit: Useful for self-recovery when a machine gets stuck, and a sensible addition to any base model. View on Amazon

For tire-specific guidance, see Best Tire Deflators for Off-Road: 3 Rhino USA Models Compared and UTV and Side-by-Side Safety: Belts, Helmets, Passengers.

FAQ

What does “base model” mean for a side-by-side?

A base model is the standard or entry trim from the manufacturer. It includes the core engine, drivetrain and suspension, with fewer convenience, appearance and performance add-ons than higher trims.

Is it better to buy a base model and upgrade, or buy a higher trim?

It depends on what you plan to add. If you need features the higher trim includes, such as power steering or a specific suspension, the higher trim may be the better choice. If you would mostly add tires and protection, a base model with those upgrades added later often gives you more flexibility.

Which upgrade should I make first?

Safety items come first, including seatbelts, mirrors and lighting. Tires are usually the next most useful upgrade because they change traction in every condition.

Can I add a winch to any base model?

Not always. Check the manufacturer’s winch rating, the frame mounting points and the total vehicle weight before installing one. Some base models require a bumper or mounting kit designed for the specific model.

Do aftermarket upgrades void the warranty?

They can, depending on the part and how it affects the vehicle. Read the warranty terms and consult the dealer before installing modifications that touch the engine, drivetrain or suspension.

How much payload should I plan for?

Start with the rated payload in the owner’s manual and subtract the weight of passengers, cargo, accessories and fuel. Stay well within the rating, especially on hills and loose ground.

Should I consult a professional before modifying my side-by-side?

Yes, for anything involving steering, brakes, suspension geometry, frame mounts or electrical systems. A qualified technician or dealer can confirm that the modification is compatible and installed correctly.

Are the upgrade recommendations the same for all riding styles?

No. Trail riders, hunters, sand riders and work users have different needs, so the right upgrades depend on how and where you ride. The priority table above is a starting point.

Conclusion

Choosing among the best base-model side-by-sides with optional upgrades comes down to matching the core machine to your terrain and payload, then adding upgrades in order of importance. Start with engine, drivetrain, suspension and payload checks, then build a phased plan that begins with safety and tires. Read the owner’s manual for every modification, and keep your maintenance records current so the machine stays dependable for years.

Ready to choose one?

Lauren Holland

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our ATV, UTV/side-by-side & dirt bikes guides, checking product details against manufacturer specifications and owner feedback.