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: May not fit all frames?  We know they don't work with Pure, Stay Strong and Radio frames.  Use of bottom bracket spacers for crank clearance may work with lighter weight riders
• Available in silver or black in sizes 152mm - 170mm
• Weight = 23oz (160mm)
• Tighten Spindle Bolt to 2-2.5Nm
• Tighten Pinch Bolts to 12-14Nm