Description Updated arm shaping and spacing, the new second generation Cadet is perfect for all types of XC and trail riding.  The Heavy Duty version is for those who tend to take the more rowdy line.  So we reinforced the HD arms to take more of what you throw at it. Specifications CRANK / USE CADET : Trail / XCCADET HD : EnduroSee dropdown menu for offered arm sets BUY THIS IF : You want a Sport/Expert level alloy MTN arm set that utilizes a 3-Bolt Direct Mount interface for chainrings. MATERIAL Forged Alloy Arms | Alloy M30 spindle (30mm/28mm)Heavy Duty "HD" option WEIGHT 558g : CADET 170mm Arm set640g : CADET-HD 170mm Arm set MTNCHAINLINE - 0mm Offset Ring = 55mm CL- 3mm Offset Ring = 52mm CL "Boost"- 6mm Offset Ring = 49mm CL "Non-Boost"CHAINLINE GUIDE HERE 1X RING - Any brand 3-Bolt Direct Mount 1X MTN ring can be used.- The ring type/offset determines compatibility with any given MTN bike drivetrain.- PRAXIS DM1X RINGS Q-Factor 172mm B.B. M30 BOTTOM BRACKET (REQUIRED)BSA / BB90-92 / T47 E.B / BB30 / PF3030mm Drive Bearing / 28mm NonDrive Bearing MAIN BOLT M30 MAIN BOLT/SELF-EXTRACTOR8mm Alloy Main crank bolt for Install/Self-Extract POWEROPTIONS Aftermarket MTN Power Meters for this crank :Power2Max – NG and the NG Eco 3-Bolt Power MeterSRM – 3-Bolt Power MeterSRM – Power PedalsGARMIN – Rally Power Pedals NOTE Updated 3-bolt DM ring interface to align spacing with established chain-line offsets. Riders can use any brand 3-Bolt DM ring. See Pic - On the backside of the G2 CADET drive side arm you’ll see a sticker showing offset options to get your desired chain line.   Additional Info Country of Origin: Taiwan Imported By: Happy Earth Enterprises LLP , 3/8 Ground Floor , Opp. MG Infant School , Bilekahalli , Bengaluru - 560076 , India. Net Quantity: 1N Customer Care Address: 291, 10 Main, 5 Block, Jayanagar, Bangalore - 560041. Ph: (080)47183232, Email: support@bumsonthesaddle.com Commodity: Crankarms