Sturmey archer Drum Brake Parts Front/Rear HSB-516 90mm ModelNumber=K5191 Sizes 38T and 42T are

Sizes 38T and 42T are non-aero

Primary Color Black Bead Wire Tire Compound Endurance Tire PSI 35-70 Tire Technology RaceGuard TPI 67TPI Tire Type Clincher Tire Weight 795g Tire Width 2

but they will be safe with these discreet protection points

Defined Color Gray Direct Mount Type Direct Mount SRAM Drivetrain Speeds 12 Material Aluminum Ring Position/Type Chain Retaining Single Ring Round or Oval Round Tooth Count 46

Chainline 52mm with 3mm offset for DUB

Sturmey archer Drum Brake Parts Front/Rear HSB-516 90mm ModelNumber=K5191 Sizes 38T and 42T areReplacement small parts for Sturmey Archer hubs TECH SPECS Vendor Sturmey archer Manufacture Number HSB516. 0001. 0P Model Name Drum Brake Parts Category Hubs