The high-speed-drive versions
     
     
 
   

 

high-speed-drive with standard 27t. chainring and integrated trouser guard. Made of high resistant and lightweight 7075 aluminum alloy. The 27t. chainring equals a 67t. chainring in high gear mode!   Detail of the one-piece chainring - trouser guard unit
   

 

     
 
     
high-speed-drive with special splines, that allow to mount directly a 30 or 34t. chainring or an adapter with bolt circle diameter 130mm. For 38t. chainrings or bigger!   34 teeth equal 85 teeth in high gear mode.
     
     
 
     
Detail splines and groove for the circlip   Aluminum trouser guard: quick release with circlip
     
     
   
     

Adapter with bolt circle diameter 130mm. For chainrings with 38 teeth or bigger. Means: 95 teeth or more in high gear mode!