What is the thread pitch of the shift knob on a 2015 Subaru STi?

The thread pitch of the shift knob on a 2015 Subaru STi is M12x1.25. This means the shift knob has a metric thread with a diameter of 12 millimeters and a pitch (distance between threads) of 1.25 millimeters.

Detailed Explanation

The shift knob on a 2015 Subaru STi, like many modern vehicles, uses a standardized metric thread size. This allows for easy replacement of the shift knob if desired, as aftermarket shift knobs with the same thread specifications can be easily installed.

The M12x1.25 thread pitch is a common specification for manual transmission shift knobs. The "M12" refers to the diameter of the thread, which is 12 millimeters. The "x1.25" indicates the pitch, or distance between each thread, is 1.25 millimeters.

This thread size provides a secure and stable connection between the shift knob and the shift lever, allowing for precise and responsive gear changes. It is important to use a replacement shift knob with the correct thread pitch to ensure a proper fit and avoid any issues with the shifting mechanism.

Importance of Proper Shift Knob Fitment

Using the correct shift knob thread pitch is crucial for the proper functioning of the manual transmission in a 2015 Subaru STi. An improperly fitted shift knob can cause the following issues:

• Difficulty shifting gears due to a loose or unstable connection


• Potential damage to the shift lever or transmission components if the shift knob is not securely tightened


• Decreased driving experience and control over the vehicle

Therefore, it is essential to ensure any replacement shift knob for a 2015 Subaru STi has the correct M12x1.25 thread pitch to maintain the vehicle's performance and reliability.

What size is the Shift Knob thread on a Mazdaspeed 3?

The MazdaSpeed 3 shift knob thread size is M10 x 1.25mm. This metric thread size applies to the manual transmission and is standard for many other Mazda models, including the Mazda 3, MX-5, and RX-7. 

• M10: This refers to a thread diameter of 10 millimeters. 
• 1.25mm: This is the pitch of the thread, meaning the distance between each thread. 

What size is the Shift Knob thread on a 2017 WRX STI?

12x1.25
Shift Knob Thread Sizes

Make	Model	Adapter
Subaru	WRX	12x1.25
Toyota	86 - Manual	12x1.25 Reverse Lock Adapter
Toyota	86 - Auto	10x1.25
Toyota	Celica	12x1.25

What size are Shift Knob threads?

Shift knob thread sizes vary widely by vehicle, but common sizes include metric threads like 10mmx1.510 m m x 1.510𝑚𝑚𝑥1.5, 12mmx1.2512 m m x 1.2512𝑚𝑚𝑥1.25, and 12mmx1.512 m m x 1.512𝑚𝑚𝑥1.5. Imperial sizes such as 3/83 / 83/8-16 and 1/21 / 21/2-20 are also used, especially in older domestic vehicles. To find the correct size, it is best to check your vehicle's manual or measure the threads on the shifter. 
Common shift knob thread sizes

• Metric:
  • 10mmx1.510 m m x 1.510𝑚𝑚𝑥1.5 (common in many imports like some Hondas and Acuras) 
  • 12mmx1.2512 m m x 1.2512𝑚𝑚𝑥1.25 (used in many Fords, Lexuses, and some Nissans) 
  • 12mmx1.512 m m x 1.512𝑚𝑚𝑥1.5 (common in many Audis) 
• Imperial:
  • 3/83 / 83/8-16 (used in some older Mustangs, Jeeps, and other domestic vehicles) 
  • 1/21 / 21/2-20 (used in some older Mustangs and other classic American cars) 
  • 9/169 / 169/16-18 (used in some Corvettes and other vehicles) 

How to determine your vehicle's thread size

• Consult your vehicle's manual: The owner's manual often lists specifications for your vehicle's components.
• Check online resources: Many aftermarket parts websites have a guide to common shift knob thread sizes by make and model. 
• Measure the threads: If you can't find the information, you can manually measure the threads on the shifter. 
  • Metric: Measure the diameter (e.g., 10mm, 12mm) and the distance between threads (the pitch, e.g., 1.25mm, 1.5mm). 
  • Imperial: Use a thread pitch gauge to measure the threads per inch (TPI) or count the number of threads per inch if you have a lot of them. 

What is the thread pitch of a Subaru Shift Knob?

The Subaru shift knob thread pitch is M12 x 1.25 for most manual and CVT/automatic transmissions. This means the thread has a diameter of 12mm and a pitch of 1.25mm. 
This video demonstrates how to replace a shifter ball in a Subaru WRX/STI: 56sRedneck TechYouTube · Apr 18, 2024

• Manual Transmission: The standard thread pitch is M12 x 1.25. 
• CVT/Automatic Transmission: The thread pitch is also M12 x 1.25. 
• For compatibility: Most aftermarket shift knobs designed for Subaru will have this M12 x 1.25 thread pitch, or will include an adapter for it. 

This video compares different shift knob options for Subaru WRX and STI: 58sSubiSpeedYouTube · Jun 20, 2014