BST Twin TEK 21 x 3.5 Front Wheel for Hub Mounted Rotor - Harley-Davidson Touring Models (09-20)

  • SIZE : 3.5" x 21"
  • BRAKE ROTOR PCD : 5 x 3.25” (82.5mm) – “Hub Mounted”
  • WEIGHT : 9.05 lb. (4.10 kg) Add 0.50 lb. (0.22 kg) with Worldwide Bearings ceramic bearings Add 0.60 lb. (0.27 kg) with Worldwide Bearings steel bearings
  • STATIC LOAD RATING : 440 lb. (200 kg) 
  • MATERIALS : Carbon fiber and aluminum
  • STYLE : Straight, five-spoke configuration
  • VALVE STEMS : BST Ultra-High-Speed (UHS) 90-degree, aluminum stems and caps
  • APPROVALS : DOT E and JWL for street and track use
  • FITMENT : Direct OEM replacement 
  • WARRANTY : 2 Years

For ABS equipped H-D models: Altering the diameter of the front wheel requires the wheel speed sensor to be recalibrated to prevent loss of braking. See ‘Technical’ tab for additional information.

For Harley-Davidson models equipped with factory ABS: When altering the diameter of the front wheel, the wheel speed sensor needs to be recalibrated to prevent loss of braking. Brock’s Performance now offers MC Bagger ABS Recalibration Bearings to eliminate this issue. These bearings eliminate ABS malfunction and warning lights when removing your stock sized Harley-Davidson wheel and fitting a 21” BST wheel. To order, select option “ABS Recalibration Steel Bearing Kit” in the bearing options dropdown (MC Bagger ABS Recalibration Bearings are not available in ceramic).


  • Road Glide - FLTR (2009)
  • Road Glide Custom - FLTRX (10-13)
  • Road Glide Ultra - FLTRU (11-13)
  • Road Glide Special - FLTRXS (18-19)
  • Road Glide Limited - FLTRK (2020)
  • Street Glide - FLHX (09-13)
  • Street Glide Special - FLHXS (18-19)
  • Road King - FLHR (09-13)
  • Road King w/ Wire Spoke Wheels - FLHR (2014)
  • Road King Special - FLHRXS (17-19)
  • Road King Classic - FLHRC (09-13)
  • Road King Classic - FLHRC (18-19)
  • Electra Glide - FLHT (09-10)
  • Electra Glide Classic - FLHTC (09-13)
  • Ultra Classic - FLHTCU (09-13)
  • Ultra Limited - FLHTK (10-13)


Shipping Delays

We are aware there are orders outstanding. Rest assured that your order has not been missed nor forgotten. Things here at Fat Head Cycles have changed drastically over the past few months and our small operation has had to adjust and adapt to maintain the accuracy and quality of our products. Our supply chains have been affected, distribution centers are backlogged and national shipping agencies have been severely affected by COVID19. Unfortunately, these things are completely out of our control.

The majority of orders containing Sony and Rockford products take between 21-28 BUSINESS days to custom assemble, ship and arrive at your doorstep. Once your order ships you will receive a SHIPPING CONFIRMATION email stating your order is on the way with tracking information. If you have not received this email your order is still in fulfillment que and is working its way up the list. Due to the fluid nature of the supply chain at this time, Fat Head Cycles CANNOT provide ETAs on bundles that have yet to ship as many times we are simply waiting on one small part or another to complete the package.

We here at Fat Head Cycles appreciate you as a customer and will always do the best we can to accommodate and fulfill your requests and your need for the best Harley Davidson audio and performance products in the industry. Thank you for your understanding.
We appreciate you,The Fat Head Cycles Team