• Portland Design Works - Gravity Plus USB Tail Light - One Color
    Portland Design Works - Gravity Plus USB Tail Light - Detail
  • Portland Design Works - Gravity Plus USB Tail Light - One Color
  • Portland Design Works - Gravity Plus USB Tail Light - Detail
Portland Design Works - Gravity Plus USB Tail LightView Larger Image

Portland Design Works Gravity Plus USB Tail Light

25% Off
$29.99 $39.99

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    • One Color, One Size
      sale $29.99
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    Tech Specs

    ⚠️ WARNING:
    Cancer & Reproductive Harm - P65Warnings.ca.gov
    Bulbs:
    Cree LED
    Power Source:
    rechargeable li-polymer battery
    Modes:
    solid, flash
    Lumens:
    [solid] 20, [flash] 80
    Burn Time:
    [solid] 12 hours, [flash] 30 hours
    Mount:
    mounts vertically or horizontally, brackets included for seatpost and seatstay
    Waterproof:
    resistant to oncoming showers and splashes
    Includes:
    USB charging cable, seatpost mount, seatstay mount
    Claimed Weight:
    54g
    Recommended Use:
    commuting, road cycling
    Manufacturer Warranty:
    limited lifetime

    Gravity Plus USB Tail Light

    The Gravity Plus USB Tail Light has a built-in accelerometer that detects deceleration or swerving and automatically changes to a super bright solid beam to warn following traffic. There are two modes, solid and flash, both of which transition to the 100 lumen solid beam upon braking or maneuvering your bike. You must calibrate the light each ride, but it's as simple as powering it on and keeping your bike still for one second to allow calibration. The Gravity Plus tail light includes brackets for mounting on your seatpost or seatstay, and can be positioned horizontally or vertically depending on your preference.

    • A tail light that automatically brightens to warn traffic
    • Accelerometer detects braking or swerving & activates warning light
    • Weatherproof exterior for all-season riding
    • Mounts horizontally or vertically depending on preference
    • Includes brackets for seatpost and seatstay mounting
    • USB rechargeable battery for simplicity and convenience

    Cool Design, poor mounting bracket

    • Familiarity: I've used it once or twice and have initial impressions

    The light worked as advertised, however it fell off on the 2nd ride never to be seen again. The strap was still attached but the light came off at some point and it seems to be a poor quality on the attachment design. Not worth $40 for 1 ride.