Features: Not like common goods in the market, FIRST's converter for press-fit BB (46mm) to external threaded BB (1.37" x 24T) is with patented structure for easy assembly and disassembly by simply loosening the bolts with allen key which is not disposable any more. At the same time, the frame (BB shell) can be protected from being damaged. Specifications: • Converter for Press-Fit BB (43mm) to External Threaded BB (1.37” x 24T) • Compatible for BB Shell I.D. 46mm and Width 68mm~73mm • Patent Pending
1. Crank construction: AL-7050 T73 2. BB axle integrated crankset 3. Bolt circle diameter: 130mm 4. Chainring: 52T x 39T x 30T_ 50T x 39T x 30T, AL-7075 T73 5. Crank arm length: 165mm, 170mm, 172. 5mm, 175mm 6. Crank arm: forged AL-7050 T73 7. Average weight: 940g±10g/175mm BB not included 8. BB shell width: 68/70 9. Chainline: 45mm 10. Speed: 9/10 11. Q-factor: 128±1. 5mm 12. Spindle: SCM440 13. Finish: crank-high polished silver/black/grey, chain rings: bead blast silver/black/grey 14. For BB30 system
Specifications: External threaded BB fits road bikes. Features: It can properly correct the poor perpendicularity of the assembled external crankset and axle and the eccentricity caused from left/right thread and BB shell. Function of waterproof is also added.