Serfas Thunderbolt 2.0 Taillight

In stock
Curbside Pickup

Serfas Thunderbolt 2.0 Taillight

The Serfas Thunderbolt 2.0 Taillight has solid and flash modes to help you stay visible, day or night. The strip of 30 high-powered red micro LEDs are housed in an attractive CNC aluminum heat sink light body.


  • USB rechargeable
  • Strip of 30 high powered red micro LEDs
  • Three solid modes: High (25 lumens/1.5 hours), Medium (15 lumens/2.25 hours), Low (10 lumens/5.5 hours)
  • Four flash modes: Daytime Flash (50 lumens/19.5 hours), High Flash Slow (25 lumens/9.5 hours), High Flash Fast (25 lumens/5 hours), Low Flash (10 lumens/13 hours)
  • Auto safe mode extends runtime an additional 45 minutes
  • Water resistance rating of IPX4
  • Charge indicator light
  • Battery level light


  • Thunderbolt 2.0 taillight
  • Aero post bracket
  • Small o-ring
  • Medium o-ring
  • USB cable
  • Manual
More Information
Crank Arm Length145 mm
BatteryLithium polymer, 500mAh
Manufacturer's Part #TBT-50R
Lumens25 lumens (high), 15 lumens (medium), 10 lumens (low), 50 lumens (daytime flash), 25 lumens (high flash), 10 lumens (low flash)
MaterialCNC aluminum heat sink housing
Run Time1.5 hours (high), 2.25 hours (medium), 5.5 hours (low), 19.5 hours (daytime flash), 9.5 hours (high flash slow), 5 hours (high flash fast), 13 hours (low flash)
Weight40 g w/ bracket