• 15+ Years of Performance Parts, Tuning & Installation

STM 15mm Wheel Spacers for 2015+ WRX / 2005+ STi

  • Backed by real installs and tuning experience at FAST of West Chester
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$189.00
$189.00
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STM 15mm wheel spacer kit for 2015-2024 WRX and 2005-2021 STi. The spacers have a 5x114.3 bolt-pattern with a 56.1mm hub. Elongated wheel studs are required when running these spacers so we offer the ARP 100-7716 M12x1.25 studs to match if you don't already have them.

Sold as a pair of two spacers with or without ARP extended studs (100-7716).
*Elongated wheel studs ARE required when running these spacers!

USA Made:
CNC machined in-house at STM, these spacers are made from billet T6 6061 aluminum. The spacers also feature recesses on the back side for easy removal.

Lightweight Design:
Unlike other spacers, the STM design is just for your Subaru. Other spacers have a universal design that also fits 5x100, but with added weight. The STM spacers are designed with additional cutouts so they are lightweight and strong.

Vehicle Fitment:
2015-2024 Subaru WRX
2005-2021 Subaru STi

Wheel Spacer Specs:
• 15mm Spacer
• 5x114.3 bolt pattern
• 56.1 hub size
• 15mm size clearly marked
• Billet T6 6061 aluminum
• Lightweight (0.97 pounds each)
• Recessed for easy removal
• CNC machined in-house at STM
• STM Products are made in the USA
• Lifetime Warranty on STM Parts to the original purchaser against manufacturing defects

ARP (100-7716) Wheel Stud Specs:
• M12 x 1.25 Thread
• 0.565" Knurl Diameter
• 3.00" UHL
• 0.27" Knurl Length
• 0.35" Nose Length
• 3.25" Overall Length

Also Available:
STM 20mm Spacers

Part Number: Includes:
STM-SUB-WS15-ARP (2) SUB Wheel Spacers
(1) Set of 10 ARP Studs (100-7716)
STM-SUB-WS15 (2) SUB Wheel Spacers

See more STM Parts

  • Earn FAST points on this part!
  • Backed by real-world installs
  • FAST WC Team Approved
STM 15mm Wheel Spacers for 2015+ WRX / 2005+ STi

$189.00

Why Drivers Choose FAST of West Chester

  • I can't recommend this place enough. Being able to trust a shop in the performance world is big. The 2hr drive to get there, is worth knowing the job will be done right. Very happy to have found this shop, to
    support my builds going forward.

    Donald Wojnar

  • I recently had the pleasure of working with FAST of West Chester for some performance upgrades on my 2022 WRX, and the experience was nothing short of exceptional. I opted for a Borla S-Type exhaust and Cygnus Coilovers, and the team at FAST nailed the installation, fitment, and setup to a T.

    Adam Cranston

  • The team at FAST are excellence in every way. First, I consulted with Dave on mods for my HPDE track car. He listened and advised me on the best parts & mods to achieve my goals. He was patient & gave me space to research the options presented & worked with me through several changes before we built. Second, the build execution was flawless, proper heat shielding, bracing and poly everywhere. All components worked as advertised.

    Bryce Budd

  • This place has been my go to shop for all things Subaru. From simple service to performance parts and tuning, they have been top notch.

    William Brunell

  • Excellent shop. They installed a Cobb Stage 2 DP and Whiteline Sway bars and end links on my 2013 WRX. The work was done right and clean. The estimate was accurate. They were very knowledgeable, friendly and gave me the straight scoop on exactly what I was getting for the money
    and what I needed to get where I want to be with it. I'd recommend them
    to any car enthusiast.

    Devin Greco

Does it come with a warranty?

Most products we carry include a manufacturer warranty. Since we work with top performance brands, warranty coverage can vary by product. If you have questions about a specific item, reach out — we’re happy to help.

Do you offer installation help or advice?

Yes — we don’t just sell parts, we install and tune them too. FAST of West Chester is a real performance shop, and we’ve worked hands-on with many of the products we carry. If you have questions about fitment, installs, or building your setup, our team can point you in the right direction.

How fast is shipping?

Many of our products ship the same day or next business day, depending on availability. We work hard to get parts out fast so you can get your build moving without delays.

What’s your return policy?

Returns for exchange or refund are accepted within 30 days of receiving your order. Items must be in new, unused condition and in original packaging. If you have any questions, our team will help make the process easy.

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