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ERD: 497mm
Uses GDH Crank Tool - older crank tools will not work
Arm length: 145mm
It will fit many modern and mid-school BMX bikes with steel and chromoly frames
Width: approx 29"
Theory American to Mid Bottom Bracket Cup Set - Aluminum - Blue Threaded ERD: 497mmThe Theory Bottom Bracket Cups allow you to use a mid size sealed bearing bottom bracket in an American size frame. They are made out of anodized 7000 series aluminum. These are made to fit 50. 8mm frames and 41. 2mm OD bearings. Color: Blue anodized
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