Serfas thunderbolt 2.0 rear bike tail light

Serfas Thunderbolt 2.0 Rear Bike Light

Regular price £34.99
Shipping calculated at checkout.

About the Serfas Thunderbolt 2.0 Bicycle Tail Light

Be seen on your bike with this bright, compact rear bicycle tail light.

The Thunderbolt 2.0 tail light features a 50-lumen output with 7 different light modes. 

We also offer the Serfas Thunderbolt 2.0 front light.


  • 50-lumen daytime flash 
  • USB rechargeable 

Weight: 40 grams

Battery: 500 mAh Lithium Polymer 

Battery life

Solid modes:

  • High (25 lumens) : 1.5 hours
  • Medium (15 lumens): 2.25 hours
  • Low (10 lumens): 5.5 hours

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 


How long does Standard Delivery take?

Standard Delivery can take between 2-5 working days. For more information please visit our Shipping page

Where is my order?

If your order has not arrived please do drop us an email at so that we can look into this for you.

Why is my discount code not working?

Discount codes are case sensitive, please double check the entry of it. 
Some discount codes have restrictions, such as SHOP15, so please read the terms and conditions. If you are still having issues please contact us on

My gift card isn't being recognised?

Please email the customer service team or use the contact us tab below and we will look into it for you. 



Orders received by 12pm will be dispatched on the same day Monday to Friday. Orders placed over the weekend will be shipped Monday, excluding bank holidays.


Free delivery for all UK orders over £100

Standard delivery £2 for orders of Sustrans maps (up to 2 maps)

Standard delivery £3.95 for orders up to 2kg 

Standard delivery £5.50 for orders over 2kg

Next day delivery (courier) £11

Rest of the world

Delivery charges vary according to weight.

EU orders are subject to VAT charges which are included in the price seen at point of payment.

Delivery is via a specialised EU courier and can take up to 2 weeks. 

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