The All New Crupi Expert Race Cranks are made using forged 6061-T6 aluminum and are now 104BCD 4-Bolt cranks meaning you will need to use a 4-Bolt gear.  

• Steel pedal inserts for strength
• Pedal washers (included) must be used at all times!
• Hollow 24mm 10-Spline chromoly spindle is permanently pressed into the drive-side arm
• Built in 104BCD 4-Bolt spider
• Note: Recommended 165lb Rider Weight Limit
• Bottom Bracket sold separately
• Note: Some frames may require use of bottom bracket spacers for crank clearance 
• Weight = 23oz (160mm)
• Tighten Spindle Bolt to 2-2.5Nm
• Tighten Pinch Bolts to 12-14Nm