Sturmey Archer X-FDD Dynamo 3.0 Front Hub+70mm Drum Brake 36h MFPN=00.6118.586.000 This link explaining 148mm "Boost"

This link explaining 148mm "Boost" spacing will help you decide if you need the M5 or M8

Model Helix R Ring Type Single (Anti-Chain Drop) Mount QuickConnect (E*Thirteen) Teeth 30 Oval/Round Round Color Bronze

Chainline/Hub Compatibility 135/142 MTB Hubs Chainline/Hub Compatibility 141/148 Boost Hubs Color Black Defined Color Black Direct Mount Type Direct Mount SRAM Drivetrain Speeds 12 Material Aluminum Offset 3 Ring Position/Type Chain Retaining Single Ring Round or Oval Round Tooth Count 36

Disc Pad Type Metal or Resin Disc Diameter 203mm Disc Material Stainless Steel Disc Rotor Weight 198g Hardware Yes Hub Compatibility ISO 6B

Sturmey Archer X-FDD Dynamo 3.0 Front Hub+70mm Drum Brake 36h MFPN=00.6118.586.000 This link explaining 148mm "Boost"Dynamo generator front hub features 3. 0 watt headlight power supply A356 aluminum hub shell with 9mm solid nutted axle (140mm overall axle length) Choose 70mm or 90mm drum brake (brake levers sold separately, UR 8820) Light sold separately: use PB 3049 Planet Bike Blaze Dynamo Headlight Model XL FDD 3. 0W Front Rear Front Axle Spacing (mm) 9x140 Nutted Hole 36 Spoke J Bend Brake 70mm Drum Color Silver Weight 1220g Size 70Mm