Go Fast Bits Lightweight Aluminum Alternator Pulley — Fits 13+ Subaru BRZ, Scion FR-S, Toyota 86

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SKU: GFB2221
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Go Fast Bits

Go Fast Bits engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Go Fast Bits lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Improve Engine Efficiency with a GFB Lightweight Alternator Pulley

The alternator is a significant source of rotational drag on your engine. By upgrading to the Go Fast Bits (GFB) Lightweight Alternator Pulley, you can reduce this parasitic loss and allow your engine to rev more freely. This simple, effective modification is perfect for enthusiasts looking to improve throttle response and overall engine efficiency without the complexity of a full pulley kit.

Precision Engineering for Your Boxer Engine

Crafted from 6061-T6 aluminum, this pulley is designed to be as light as possible while maintaining the structural integrity required for daily and performance use. The precision CNC machining ensures a perfect fit, preventing belt slippage and ensuring smooth operation under all driving conditions. It is a direct replacement for your factory alternator pulley, making the installation process straightforward and efficient.

  • Reduced Parasitic Drag: Frees up engine power for better response.
  • Lightweight Aluminum: High-strength 6061-T6 construction.
  • Precision Fitment: CNC machined for perfect belt alignment.
  • Simple Installation: A quick and effective performance upgrade.

This alternator pulley is compatible with all 2013+ Subaru BRZ, Scion FR-S, and Toyota 86 models. Whether you are building a track car or just want a more responsive daily driver, this component is an excellent addition to your engine bay. Upgrade your vehicle's performance with quality parts from GGCRACING.

Vehicle Fitment

Years Make Model Trim
2013-2016 Scion FR-S Base
2013-2019 Subaru BRZ Premium
2013-2020 Subaru BRZ Limited
2015 Subaru BRZ Series.Blue
2016 Subaru BRZ Series.HyperBlue
2017 Subaru BRZ Series.Yellow
2018 Subaru BRZ TS
2019 Subaru BRZ Series.Gray
2020 Subaru BRZ TS
2017 Toyota 86 Special Edition
2018-2020 Toyota 86 GT
2019 Toyota 86 TRD Special Edition
2020 Toyota 86 Hakone Edition

Product Details

Product Description
Part Numbers
Sizing & Fit

About Go Fast Bits

Go Fast Bits engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Go Fast Bits lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Improve Engine Efficiency with a GFB Lightweight Alternator Pulley

The alternator is a significant source of rotational drag on your engine. By upgrading to the Go Fast Bits (GFB) Lightweight Alternator Pulley, you can reduce this parasitic loss and allow your engine to rev more freely. This simple, effective modification is perfect for enthusiasts looking to improve throttle response and overall engine efficiency without the complexity of a full pulley kit.

Precision Engineering for Your Boxer Engine

Crafted from 6061-T6 aluminum, this pulley is designed to be as light as possible while maintaining the structural integrity required for daily and performance use. The precision CNC machining ensures a perfect fit, preventing belt slippage and ensuring smooth operation under all driving conditions. It is a direct replacement for your factory alternator pulley, making the installation process straightforward and efficient.

  • Reduced Parasitic Drag: Frees up engine power for better response.
  • Lightweight Aluminum: High-strength 6061-T6 construction.
  • Precision Fitment: CNC machined for perfect belt alignment.
  • Simple Installation: A quick and effective performance upgrade.

This alternator pulley is compatible with all 2013+ Subaru BRZ, Scion FR-S, and Toyota 86 models. Whether you are building a track car or just want a more responsive daily driver, this component is an excellent addition to your engine bay. Upgrade your vehicle's performance with quality parts from GGCRACING.

Vehicle Fitment

Years Make Model Trim
2013-2016 Scion FR-S Base
2013-2019 Subaru BRZ Premium
2013-2020 Subaru BRZ Limited
2015 Subaru BRZ Series.Blue
2016 Subaru BRZ Series.HyperBlue
2017 Subaru BRZ Series.Yellow
2018 Subaru BRZ TS
2019 Subaru BRZ Series.Gray
2020 Subaru BRZ TS
2017 Toyota 86 Special Edition
2018-2020 Toyota 86 GT
2019 Toyota 86 TRD Special Edition
2020 Toyota 86 Hakone Edition

Product Details

Product Description

About Go Fast Bits

Go Fast Bits engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Go Fast Bits lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Improve Engine Efficiency with a GFB Lightweight Alternator Pulley

The alternator is a significant source of rotational drag on your engine. By upgrading to the Go Fast Bits (GFB) Lightweight Alternator Pulley, you can reduce this parasitic loss and allow your engine to rev more freely. This simple, effective modification is perfect for enthusiasts looking to improve throttle response and overall engine efficiency without the complexity of a full pulley kit.

Precision Engineering for Your Boxer Engine

Crafted from 6061-T6 aluminum, this pulley is designed to be as light as possible while maintaining the structural integrity required for daily and performance use. The precision CNC machining ensures a perfect fit, preventing belt slippage and ensuring smooth operation under all driving conditions. It is a direct replacement for your factory alternator pulley, making the installation process straightforward and efficient.

  • Reduced Parasitic Drag: Frees up engine power for better response.
  • Lightweight Aluminum: High-strength 6061-T6 construction.
  • Precision Fitment: CNC machined for perfect belt alignment.
  • Simple Installation: A quick and effective performance upgrade.

This alternator pulley is compatible with all 2013+ Subaru BRZ, Scion FR-S, and Toyota 86 models. Whether you are building a track car or just want a more responsive daily driver, this component is an excellent addition to your engine bay. Upgrade your vehicle's performance with quality parts from GGCRACING.

Vehicle Fitment

Years Make Model Trim
2013-2016 Scion FR-S Base
2013-2019 Subaru BRZ Premium
2013-2020 Subaru BRZ Limited
2015 Subaru BRZ Series.Blue
2016 Subaru BRZ Series.HyperBlue
2017 Subaru BRZ Series.Yellow
2018 Subaru BRZ TS
2019 Subaru BRZ Series.Gray
2020 Subaru BRZ TS
2017 Toyota 86 Special Edition
2018-2020 Toyota 86 GT
2019 Toyota 86 TRD Special Edition
2020 Toyota 86 Hakone Edition

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