FREE SHIPPING on orders of $50 or more.* Same day shipping before 3PM Pacific.
X
Questions? Call our experts!
1.800.651.4050
SHOP NEW ARRIVALS
DEAL OF THE DAY
ALL SALE ITEMS
SHOP CLOSEOUTS
Electronics / Lights / Tail Lights
Click to zoom
Portland Design Works Gravity 80 USB Tail Light with Auto Brake Light
Portland Design Works Gravity 80 USB Tail Light with Auto Brake Light
Portland Design Works Gravity 80 USB Tail Light with Auto Brake Light
Portland Design Works Gravity 80 USB Tail Light with Auto Brake Light

Portland Design Works
Gravity 80 USB Tail Light with Auto Brake Light

  (4 customer reviews)
Earn $4.00 in Rewards credit (400 points) What's This?
This color/size is not eligible for Rewards points
Out of Stock
ea.
$40.00
This item is currently out of stock. Click Notify Me to receive an email when the item becomes available.
InstantPrice MatchWhat is this?
Free Shipping on Orders Over $50*

Gravitational pull.

Stay in the happy, protective bubble that the Gravity USB Tail Light from Portland Design Works provides. Featuring an automatic internal accelerometer, the Gravity senses when you are slowing down and boosts the tail light's output from 20/80 lumens all the way up to 100 lumens. Housed in a weatherproof exterior, the Gravity is designed for all season, year 'round use.

In order to ensure the accelerometer correctly calibrates, always install the Gravity on your bike before turning it on. Allow for 1 second before moving your bicycle to complete the calibration.


Features:

  • Automatic accelerometer brake light function shines 100 lumens bright..
  • USB-rechargeable lithium polymer battery..
  • Weatherproof exterior for all season riding.
  • Can be mounted vertically or horizontally.
  • Includes brackets for seatpost and seatstay mounting, and Micro USB charging cord.
Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
(3)
(0)
(1)
(0)
(0)
(75%)
(0%)
(25%)
(0%)
(0%)
Bright but does not last long
rating
by Anonymous
Cycling Enthusiast
Houston, TX
0 of 1 customers found this review helpful.

The light is sufficiently bright and accelerator works well. Top light lit up when you slow down or brake. But it lasts only around 3 hours, not enough for longer rides.

Reviewed 4/10/2018
Was this review useful to you? Yes/No
Thank you for your feedback.
Excellent idea and it works
rating
by Tomahawk
Daily Commuter
SF, CA
2 of 2 customers found this review helpful.

I think this light is a great idea and it works so it gets 5 stars - on a purely technical level it can still be improved. I would prefer to use the blinking mode on this light and then when you break it adds the solid light, however the blinking mode is an epileptic techno fit not a nice calm attention grabbing blink like some of the other PDW lights. So I don't use it, instead I have a second blinking light on my pack and I use the Gravity light in the always on mode that gets brighter when braking.

It's easy to use - it remembers what mode you were in - so when turning it on it always goes to the last mode it was in - very good UX design choice.

There are definitely times when it falsely decides i'm braking, usually when going over bumps - I'm actually happy with that since it is better than if missing detection of braking.

For brightness, I think it is the right amount. When lit up in braking mode it is very bright, I actually would not want it to be brighter.

Reviewed 3/29/2018
Was this review useful to you? Yes/No
Thank you for your feedback.
Great light
rating
by Rich
Portland, Ore.
1 of 1 customers found this review helpful.

Ive used this for a few months. No moisture or usability issues. The blink is sufficiently bright but not too obnoxious to follow. The lense helps disperse the pattern a bit to not blind other cyclists. Seems like it has to be charged about every 15 hours or so. I would buy one again.

The mount has changed from previous PDW tail lights. The old style isnt compatible which was a bummer.

The brake feature works OK. The light switches to a solid pattern pretty regularly on rough stretches of pavements (e.g. chip seal will set it off almost indefinitely). It does reliably detect harder braking.

Reviewed 3/20/2018
Was this review useful to you? Yes/No
Thank you for your feedback.
Good product
rating
by Anonymous
0 of 1 customers found this review helpful.

Works well, very bright, good price

Reviewed 3/3/2018
Was this review useful to you? Yes/No
Thank you for your feedback.