Sims188 Racing currently runs a 2021 Polaris RZR RS1 in the Pro Stock Class. With the help of our partners, we ensure our car is ready to win on race day!

Pro Stock Car

2021 Polaris RZR RS1

Chassis / Suspension

  • KMC Wheels- 14″ Grenade Beadlocks
  • GBC Dirt Commander 29x9x14 Tires
  • Tireblocks- Tire Blocks
  • Elka Stage 5 Shocks Rear- 3.0, Front- 2.5
  • Roll Design Shock Tuning
  • Demon Powersports X-treme Heavy Duty Axles
  • Crown Performance Brake Lines
  • JAMAR Performance Brakes and Radius Rods
  • Candle Motorsports Transmission
  • Oceanside Driveline Custom Propshafts
  • PRP Deep Dish- Suede Steering Wheel
  • Dirt Rider Designs Custom Graphics/Wraps
  • Holz Sway Bars, Front +2 A-Arms, Rear Trailing Arms


  • Crow Safety Gear 3” Duck Bill Latch & Link 5-way Restraint- clip mount, Dog Bone Harness- 3-2 taper for head/neck devices
  • Crow Safety Gear Driving Suit, Shoes, and Gloves
  • PRP Bravo Seat
  • PRP Custom Window Nets
  • Rugged Radios MAC 3.2 Extreme Air Pumper Systems and Race Communications
  • Factory UTV RS1 Skid Plates
  • GSP Cage, Doors, Roof, Nerf Bars and Bumpers


  • Tuning by Benchmark Performance
  • Maxima Racing Oils
  • Energy Coil Racing- Energy Coil Plug & Play System and ECR Powersports Battery

Vehicle History

2021-2023 Race Seasons


“I ran this car in the Stock 1000 class in 2020, and it proved to be an extremely competitive car. During our short time off, we tore the car down to the frame and gave her a refresh to run in my rookie Pro season.” – Casey Sims

24 – Races
11 – Podiums
6 – Wins

2020 Race Season


“Even better than my first RS1, this car has been extremely capable running in the Stock 1000 class. We’re now prepping it for racing in the Pro Stock class next year. ” – Casey Sims

13 – Races
9 – Podiums
6 – Wins

2019-2020 Race Seasons


“My dad told me if I got straight A’s my last semester of 8th grade, he’d get me an RS1. I worked so hard and I did it! I was beyond stoked when my parents surprised me with this car! It’s like nothing I’ve ever raced before. I love the RS1 platform so much, we now have two. This car has a new wrap and has become my current ‘red plate’ production car.” – Casey Sims

38 – Races
26 – Podiums
10 – Wins

2018-2019 Race Seasons

RZR XP 1000

“I loved this car because of how wide it was and how the suspension handled. The ride, stability, and extra power was so far ahead of anything I had driven before. This car was super quick off the line.” – Casey Sims

18 – Races
13 – Podiums
13 – Wins

2017-2018 Race Seasons

RZR 800

“It took me a minute to get used to this car because it was so much bigger, had a lot more power than my previous cars, and 4-wheel drive. Once I got the hang of it, I loved this car because I felt like I was in a cockpit. This car was and is still one of a kind.”
– Casey Sims

39 – Races
36 – Podiums
21 – Wins

2016 Race Season

RZR 170 “Center Seat”

“My center seat 170 was one of my most favorite cars. It was my first center seat car and the first time I drove it, I won the UTV World Championship. It was awesome!” – Casey Sims

16 – Races
15 – Podiums
13 – Wins

2015-2016 Race Seasons

RZR 170

“I remember being so excited to get my first race car and start racing! I won my first race ever in this car and I was hooked!”
– Casey Sims

29 – Races
29 – Podiums
18 – Wins