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45°/ 45° ACB (for BMX/ freestyle)
• One piece continuous carbon fiber construction
• Compatibility: BB392 BB392 crank to BSA frame
• Anodized black finish
Metron 4D Flat M.A.S. Bar w/ J-Bend Extensions Drivetrain 45°/ 45° ACB (for BMX/The Metron 4D Flat combines the superb ergonomics and aerodynamics of the Metron 4D, with a lower hand position and an innovative optional Modular Aero System (MAS) direct mount clip on system for additional versatility. Aerodynamic integrated Cable Routing (ACR) recommend for electronic shifting only J Bend extensions included, S Bend available separately Includes spacer kit, bridge, and computer mount SIZING 31. 8mm x W400+10mm, 420+10mm, 440+10mm
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