ACS Crossfire External BB Set
Best durable bottom bracket upgrade for mountain and road bike enthusiasts.
A robust and reliable upgrade for riders utilizing two-piece cranksets. The precision-machined aluminum housing and sealed bearings offer a significant boost in stiffness and longevity over standard stock components.
$54.02
at
Roy's Cyclery
More Crossfire options
Who it's for
- Riders needing long-lasting components for rugged, daily abuse
- Home mechanics who prefer quick, hassle-free maintenance routines
- Performance cyclists seeking stiffer cranks and efficient power transfer
Who should skip it
- Cyclists with non-standard frame shells or older spindle sizes
- Commuters riding in wet, muddy, or harsh weather conditions
- Budget-conscious shoppers looking for basic, affordable replacement parts
Performance breakdown
Bearing smoothness
Precision seals keep rotation fluid while effectively blocking out trail grit.
Structural rigidity
Forged aluminum construction provides a stiff, reliable platform for power transfer.
Installation versatility
Standard BSA threading makes this a straightforward swap for most frames.
Weather resistance
Sealed design offers solid protection against mud and wet riding conditions.
Component compatibility
Standard 24mm spindle interface works seamlessly with most two-piece cranksets.
Build durability
CNC-machined finish ensures long-term resilience under heavy pedaling loads.
Key Specs
Material
Forged and CNC-machined aluminum
Bearing Type
Precision sealed
Spindle Diameter
24mm
Shell Width
68/73mm
Thread Specification
BSA 1.37"x24T
Compatibility
2-piece cranks
Know before you buy
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Ask Metto anything about the ACS Crossfire External BB Set before you decide.
