Promax EX-2 Bottom Bracket
Best durable upgrade for budget conscious BMX racers.
A reliable, CNC-machined upgrade for threaded frames using 30mm spindle cranksets. It balances durability with smooth, low-friction rotation, ensuring a solid connection between the crank and frame without unnecessary complexity.
$39.99
at
Airpark Bike Co
Who it's for
- Riders seeking a reliable replacement for standard 24mm spindle cranksets
- Cyclists prioritizing durable components that withstand regular trail or track use
- Commuters and racers wanting efficient power transfer without excessive maintenance
Who should skip it
- Home mechanics who prefer working with universal or common hand tools
- Weight-conscious racers looking to shave every possible gram from their build
- Extreme all-weather riders frequently tackling deep mud or harsh winter conditions
Performance breakdown
Structural Rigidity
CNC-machined aluminum cups provide a stiff, reliable platform for power transfer.
Contamination Resistance
Labyrinth seals effectively block grit and moisture from entering the bearings.
Installation Simplicity
Standard BSA threading makes setup straightforward for most home mechanics.
Bearing Smoothness
Custom sealed bearings offer consistent rotation without excessive drag.
Maintenance Ease
Simple design allows for quick servicing and long-term component care.
Weight Efficiency
Solid construction adds a bit of heft compared to premium alternatives.
Key Specs
Material
CNC-machined aluminum
Weight
272 grams
Spindle Diameter
30 mm
Shell Width
68 mm, 73 mm
Bottom Bracket Standard
English (BSA)
Spindle Interface
RaceFace/Easton CINCH
Sealing Type
Labyrinth double-lip low friction
Bearing Type
Custom sealed
Know before you buy
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Ask Metto anything about the Promax EX-2 Bottom Bracket before you decide.
