Original: $259.88
-65%$259.88
$90.96The Story
The SG-B103-MS4 GSR 29T M/S 4th Gear is a carbon-lined 4th-gear synchro from Synchrotech, engineered for Honda/Acura B18C GSR & Type R transmissions. Carbon friction material grips faster and wears longer than factory brass, delivering smoother, more consistent shifts under hard use — on the street, strip, or track.
Why upgrade to carbon synchros:
- Faster, smoother engagement and reduced grind
- Superior heat and wear resistance vs. OEM brass
- Ideal for high-horsepower, high-RPM and track use
- Direct-fit replacement — no transmission modification required
Backed by Synchrotech quality and shipped fast from Speedzone Performance.
Description
The SG-B103-MS4 GSR 29T M/S 4th Gear is a carbon-lined 4th-gear synchro from Synchrotech, engineered for Honda/Acura B18C GSR & Type R transmissions. Carbon friction material grips faster and wears longer than factory brass, delivering smoother, more consistent shifts under hard use — on the street, strip, or track.
Why upgrade to carbon synchros:
- Faster, smoother engagement and reduced grind
- Superior heat and wear resistance vs. OEM brass
- Ideal for high-horsepower, high-RPM and track use
- Direct-fit replacement — no transmission modification required
Backed by Synchrotech quality and shipped fast from Speedzone Performance.
