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48T Spline CrMo Bottom Brackets for Chromoly cranks.

68/73mm x 155mm Downhill Bottom Bracket with 48 Tooth Spline 4140 19mm CrMo spindle


19mm Titanium spindle 


Our AC MTB Downhill Bottom brackets are designed with 4 precision cartridge bearings. They have all spacers necessary to adjust for the proper chain line. 

MTB Square Taper Bottom brackets are available in 110mm, 113mm, and 122 mm in either CrMo or Titanium spindles. 

Spindle Shell Length Weight
Titanium 68/73mm


Titanium 68/73mm 113mm 173g
Titanium 68/73mm 122mm 178g
CrMo 68/73mm


CrMo 68/73mm 113mm 288g
CrMo 68/73mm 122mm 298g

MTB ISIS  Bottom Brackets are made with 4 angular contact sealed cartridge bearings. They are available in 113 or 118 mm spindle lengths, and in either CrMo or titanium material. They are used for both freeride and downhill applications.



Spindle Shell Length Weight Available
Titanium 68mm 113mm 175g 11/01
Titanium 78mm 113mm 185g 11/01
CrMo 68mm 113mm 285g 10/01
CrMo 73mm 113mm 285g 10/01
CrMo 68mm 118mm 320g 10/01
CrMo 73mm 118mm 320g 10/01