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Lumos Firefly Rear Turn Signal Mount Lumos Remote (USB-C charging) + Handlebar Mount Lumos Firefly Universal Mount
Lumos Firefly Rear Turn Signal Mount Lumos Remote (USB-C charging) + Handlebar Mount Lumos Firefly Universal Mount
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  2.  Firefly Turn Signal Upgrade Kit

Firefly Turn Signal Upgrade Kit

$54.95 USD $62.85 USD

Firefly Turn Signal Upgrade Kit Fit Guide

Measuring your head size
1
Find a measuring tool Use a soft tape, rope or even your charging cable. Place it against a ruler to measure.
2
Measure your head Wrap it around your head, position it mid-forehead and above the eyebrows and ears.
3
Find your helmet size Identify if it’s a good fit. Firefly Turn Signal Upgrade Kit fits most head shapes with the adjustable dial fit system.

We strongly advise that you measure your head size before purchasing to ensure the helmet fits perfectly around your head.

Determining Your Head Size

Sizing Small Medium-Large Extra Large
Inches 20in. - 21.7in. 21.3in. - 24.0in. 24in. - 25.6in.
Centimetres 51cm - 55cm 54cm - 61cm 61cm - 65cm
Weight (MIPS) 370g 409g 450g
Weight (Standard) - 370g -

We strongly advise that you measure your head size before purchasing to ensure the helmet fits perfectly around your head.

Upgrade a pair of Lumos Firefly lights with handlebar-controlled rear turn signals, with free shipping.

  • Lumos Remote (USB-C charging) + Handlebar Mount: signal from your handlebar and unlock automatic brake lights.
  • Lumos Firefly Rear Turn Signal Mount: holds your lights under the seat post at a road-safe spacing for clear signals.
  • Lumos Firefly Universal Mount: an extra mount to move a light between bikes or positions.

Lights not included. Costs less than buying the three items separately.

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