Biltwell Thunder Risers

This riser’s one-piece design increases riser stiffness and clamping power on rubber-mounted top trees, and is a boon to performance and style on practically any motorcycle. 


  • Investment-cast
  • CNC-machined stainless steel
  • 5/16” x 18 t.p.i. stainless steel bar clamp hardware
  • 4 3/8" wide top clamp (4 1/2" wide knurling may show)
Fitment Notes & Exceptions
This is a universal fit part; it may or may not fit without modification.
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what size bars fit these risers?
A shopper on Jun 17, 2017
BEST ANSWER: 1" bars at the clamp.
Product Style Item # Manufacturer Product # Availability
Black 889793 ER-175-SS-BK In Stock: Ships next business day
Polished 889792 ER-175-SS-PS In Stock: Ships next business day