Built Around the Right Weight — Not the Heaviest.
Factory engineers tune shift feel carefully. OEM knobs aren't heavy because heavy is good — they're a specific mass chosen for the transmission, the lever geometry, and how a hand wants to work them. Heavier isn't always better.
ShiftMass was built on a different idea: the right weight is personal, and it's tunable.
The Weight System
The Orbit Head sits at 128g — a round profile in bare anodized aluminum. Balanced, neutral, the classic shape.
Three brass rings (18g / 30g / 52g) thread onto the base and lock together with brass-on-brass friction — no set screws, no loose hardware. Position them anywhere along the shaft.
Eight weight settings from 156g unloaded to 256g fully loaded:
- 156 g — unloaded
- 174 g — + 18g
- 186 g — + 30g
- 204 g — + 18g + 30g
- 208 g — + 52g
- 226 g — + 18g + 52g
- 238 g — + 30g + 52g
- 256 g — all three rings
Install once: thread the base onto your factory M12x1.25 shifter, align the head, and lock with the stainless set screws. From there, heads and weights swap by hand.
Fits the Gen 2 Large Reverse Lockout
Machined specifically for the 2022+ Subaru BRZ and Toyota GR86, which use an oversized reverse lockout collar (approximately 28mm) at the base of the factory shifter. Our Large Lockout base has an expanded internal cavity to clear it — no adapters, no shimming.
If you have a Gen 1 BRZ, Scion FR-S, Toyota 86, Subaru WRX, or STI, you want our Standard Lockout version instead — same product, tuned for the smaller factory lockout.
Three Heads at Launch
- Orbit — 128g, round profile, anodized aluminum (this product)
- Apex — 120g, extended profile, Alcantara wrap
- Arc — 146g, contoured profile, Alcantara wrap
Coming Soon
- Track Edition — 90g hollow, OEM-close feel
- More head profiles in development — sign up on the email form to hear first
One base. One ring set. Any head. Your feel, your car, your range.
What's Included
- ShiftMass™ Orbit Head (finish of your choice)
- Weight-adjustable Base with Large Lockout cavity (finish of your choice)
- Brass weight ring set — 18g / 30g / 52g
- Stainless set screws & Allen key
- Printed setup instructions
Built entirely in a small USA machine shop in Texas
- 6061-T6 aluminum with a solid brass tunable weight system
- M12x1.25 direct-fit threading — no adapters
- Large 29.21mm (1.15") internal cavity for Gen 2 BRZ/GR86 fitment
- Head finishes: Polished Black, Brushed Gold, or Brushed Grey (anodized aluminum)
- Base finishes: Gloss Black / Brushed Gold / Brushed Grey / Natural
- Designed, machined, and assembled in-house
- Compatible with all current and future ShiftMass™ heads
Not sure which fits your car? Check the fitment guide below, or message us with your vehicle — we'll verify before shipping.
Street Machine Works
