This is the We The People HELIX REAR HUB GUARD for WTP Helix and Hybrid Freecoaster hubs.

Vendor Item No:

• 23001030119 (NDS)
• 23001040119 (DS)

Features:

• Nylon/fiberglass hub guard designed to fit perfectly on WTP Helix and Hybrid Freecoaster hubs
• Non Drive Side Guard or Drive Side Guard (choose options above)
• Weight : 30g

NDS (Non Drive Side) vs DS (Drive Side) Explained:

In a bicycle wheel, the driveside is the side where the chainrings and cassette (where the chain connects) are located, and power is transferred to the wheel. The non-driveside is the opposite side, where the brakes and sometimes gears are located. The driveside experiences higher forces due to pedaling and is often designed with more robust components. 

Driveside:

• Function: Transmits power from the pedals to the wheel.
• Components: Typically houses the cassette (or freewheel on older bikes), and often has a stronger axle and more robust hub design to handle the pedaling forces.
• Spoke Pattern: The spoke pattern on the driveside is often more complex due to the need to handle the torque generated by pedaling. 
  

Non-Driveside:

• Function: Houses the braking mechanism (disc or rim brake), and sometimes the gear shifters and derailleurs.
• Components: May have a lighter axle and hub design compared to the driveside, as it doesn't bear the same pedaling forces.
• Spoke Pattern: The spoke pattern is typically simpler than on the driveside, as it doesn't have to handle the same torque. 

Product Specifications:

• Primary Color: Black
• Position: Rear

Shipping Weight & Dimensions:

NDS

• Shipping Length (L): 8.2"
• Shipping Width (W): 4"
• Shipping Height (H): 1"
• Shipping Weight: 1 lb

DS

• Shipping Length (L): 8"
• Shipping Width (W): 4"
• Shipping Height (H): 1"
• Shipping Weight: 1 lb