Product Name :

KOM Challenger - Modified FreeWheel for Shimano/Sram

Product Description

Are you certainly sure the ratio on your bike truly suit you??

If not, don't need to buy a whole FreeWheel. when the gear ratio not suit you.

Plus one and then get all new feeling.

Own a bike as your imagine & wish.

Your request, I can make it.


  Original tooth     Suggested Modified tooth   New tooth
  11-28 30t or 32t   12-30 or 12-32  
  11-30 32t or 34t 12-32 or 12-34
  11-32 34t or 36t 12-34 or 12-36

G name KOM Challenger Modified FreeWheel
Teeth option 28t. 30t. 31t. 32t. 34t. 36t.
Weight 49g
material Al 7075
fitting   Shimano                                 
           Dura Ace /Ultegra/ 105   
Red/ Force/ Rival
  • Teeth number can be customized.   
  • hard anodizing for Campagnolo.