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Rear Light Adapter

Old 10-12-18, 07:30 PM
  #1  
The Big Wheel
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Rear Light Adapter

I would like to mount a rear bike light on my rear rack of my bike however the light comes with a mount that goes on the seatpost. Problem is

1) I can't mount the light to the seatpost because when I carry a bag on my rear bag it covers up the light 100%

2) My rack doesn't have a "seat post tube" to attach the light onto.

Here is a photo I found online of a guy that fixed the problem but it looks really bad. Isn't there some kind of adapter I can buy? Has anyone else fixed this issue and would like to provide some photos?

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Old 10-12-18, 08:04 PM
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Cygolite sells a rack mount for $3.95 (plus $3.00 shipping)
It fits both older Hotshot and newer Hotshot Pro lights. The two outside mounting bolt holes are at 50mm (1.97 inch) spacing, that's pretty common on rear racks. Or use the center bolt hole if there's only one hole.

It's the same click-in method as the seatpost brackets use.
When clicked in, my tail light sits below the level of the top of the rack, so a top bag doesn't interfere with the light.



There's similar brackets for other brands, too.

Last edited by rm -rf; 10-12-18 at 08:15 PM.
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Old 10-12-18, 08:30 PM
  #3  
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If you lived even remotely close to me, I could fabricate something in about 10 minutes.

But as you don't, I would say remove the rear reflector, and use that hole to screw into a piece of dowel-- probably 1 1/4". Put the light's seatpost mount on that.
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Old 10-12-18, 09:02 PM
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Just do what that guy did more or less and make it look better.

Or zip tie it to your helmet. Puts the blinky up higher.
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Old 10-12-18, 10:28 PM
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Originally Posted by Happy Feet View Post
Just do what that guy did more or less and make it look better.

Or zip tie it to your helmet. Puts the blinky up higher.
Up higher but on something that is not mounted to the bike and moves around in different directions than the bike. A good concept in theory if you keep your head in a perfect position so cars can see but not as ideal when you do normal human stuff.
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Old 10-13-18, 12:23 AM
  #6  
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I have one on my old helmet snd have seen many others do it as well. Works fine. It's a red flashing light designed to be seen from an arc of rear facing angles.

But this is a great easy project to try out. All you need is a friend, a light, a helmet and a zip tie.
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Old 10-13-18, 03:51 AM
  #7  
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No pics, but I think you could use a small P-clamp, which would mount onto the rack's rear diagonal down-brace, about where the dowel rod is beside the reflector. Remove the round seatpost clamp part from your light mount, and thread a small bolt with nut (if your bolt and nut on your light mount won't work) through the p-clamp hole and tighten it well.

​​​​​​
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Old 10-13-18, 06:57 AM
  #8  
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I used a smaller bracket to mount on one of the rack stays on one bike. Something like this. I may have added more rubber to fit it.

https://www.modernbike.com/niterider...eat-stay-mount
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Old 10-13-18, 08:17 AM
  #9  
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you didn't say or show us what light & rack you have. I agree that there's a big lack of support for this exact circumstance with rear lights, even those that supply multiple brackets with their lights. they all seem to assume we want to mount them on circular objects. well we don't all want to do that, do we?

probably the easiest stuff to work with is metal strapping from the hardware store. it comes on a roll, is easy to bend, already has 2 sizes of holes along the whole length. to cut it to length it's best to use metal snips. altho you can break it with pliers or a hammer by bending it back & forth and slamming it at the crease. it's also easy to twist so you can make odd angles

this is my roll


these are the Midwest Standard, drop forged, snips I inherited from my father-in-law


once you have these two things, you can make all sorts of stuff for your bike






your local hardware store may also have lightweight thin "bar stock" that is easy to cut with a bench vise & hack saw. no home should be without those items as well. bar stock comes in aluminum & steel. it's easy to drill with metal drill bits on a wooden work bench & a clamp




so put that circular bracket in a box for safe keeping & make a bracket exactly as you need it

btw your light may have come with a small bracket, which can fit on seat stays or in this case a small part by my dropout


Last edited by rumrunn6; 10-13-18 at 09:27 AM.
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Old 10-13-18, 09:03 AM
  #10  
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Originally Posted by rm -rf View Post
Cygolite sells a rack mount for $3.95 (plus $3.00 shipping)
It fits both older Hotshot and newer Hotshot Pro lights. The two outside mounting bolt holes are at 50mm (1.97 inch) spacing, that's pretty common on rear racks. Or use the center bolt hole if there's only one hole.

It's the same click-in method as the seatpost brackets use.
When clicked in, my tail light sits below the level of the top of the rack, so a top bag doesn't interfere with the light.



There's similar brackets for other brands, too.
The first bracket in your link has two holes that will mate to the refector bracket. Iíve used that variety for many bikes. Hereís one

DSCN0387 by Stuart Black, on Flickr

I will suggest adding something to keep the light in place...a zip tie or o-ring. Some of the lights will pop out. I find lots of them on the road...mostly smashed.

I would also suggest some rear taillights over others. Most all states in the US require rear reflectors. There arenít that many taillights that are also reflectors. The Portland Design Works Radbot is one and the Cateye Reflex is another. Most of the others donít really have integrated reflectors.
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Old 10-13-18, 09:50 AM
  #11  
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I simply drilled a hole in the plastic "ring".
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Old 10-13-18, 10:02 AM
  #12  
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DIY any?

I have more than 1 tail light that will mount directly to that bracket
with the 2 holes 2 cm apart vertically.. with a screw..

and have a couple lights, German spec, B&M, 2 bolts 5 cm apart, horizontally,
they include both LED and passive reflectors.. they're fixed.

But will admit People might steal your light if they can , (in major cities and school bike racks)
so put it in your pocket when you lock up your bike..




...
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Old 10-13-18, 06:00 PM
  #13  
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Originally Posted by BobbyG View Post
I simply drilled a hole in the plastic "ring".
genius!
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Old 10-14-18, 09:42 AM
  #14  
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He
re is a better look at mine...
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Old 10-14-18, 09:50 AM
  #15  
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Home Depot has what you need for like $2

It's an angle bracket.

It's sort of this like...
https://www.homedepot.com/p/Superstr...G-10/100390324

except instead of both brackets going the same direction one is twisted 90 degrees. I couldn't find it on the website, but go into any Home Depot and you'll find it in 10 minutes.

Bolt it directly to the rear rack and then bolt the light's mount to the twisted part of the bracket. Viola.
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Old 10-14-18, 11:00 AM
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With each post, this thread gets a bit more like an episode of GCN's Hack or Bodge. Not that there's anything wrong with that.
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Old 10-14-18, 03:06 PM
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If you have fenders, you can mount a tail light to the rear fender:

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Old 10-14-18, 09:41 PM
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Originally Posted by JohnDThompson View Post
If you have fenders, you can mount a tail light to the rear fender:

I did this on the bike I had from 1987-1997.
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Old 10-14-18, 09:47 PM
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On my MTB-based commuter I have a rear blinky with what is like a pocket clip. I put an orange velcro strap between the Wald folding baskets and clipped it there.

BTW, the black bag behind the orange strap carries two cloth bags I use in the Wald folding baskets to carry small items that would fall through the wires.
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Old 10-14-18, 09:48 PM
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See the object just below the rear of the saddle?
That is a short piece of wooden dowel attached to the end of a 1/8" x 3/4" aluminum bar stock, with the end bolted to the rack.
It works nicely with my Dinotte 140R tail light.
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Old 10-14-18, 09:54 PM
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Originally Posted by Shimagnolo View Post
See the object just below the rear of the saddle?
That is a short piece of wooden dowel attached to the end of a 1/8" x 3/4" aluminum bar stock, with the end bolted to the rack.
It works nicely with my Dinotte 140R tail light.
Are you sure that chain couldn't be reduced by a pair of links? Looks like a bump could make the chain contact the derailleur cage. That aside, what a beautiful bike!
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Old 10-14-18, 09:58 PM
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Originally Posted by daoswald View Post
Are you sure that chain couldn't be reduced by a pair of links? Looks like a bump could make the chain contact the derailleur cage. That aside, what a beautiful bike!
That is on the small/small combo which is never used in actual riding.
I have tested it in in every gear, and it does work fine, even if it looks wonky.
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Old 10-15-18, 05:38 AM
  #23  
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Several companies that sell tail lights sell brackets to attach them to a rear rack.

What light do you have?
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Old 10-15-18, 09:13 AM
  #24  
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Originally Posted by Kapusta View Post
Several companies that sell tail lights sell brackets to attach them to a rear rack.
Planet Bike has one for their Superflash rear lights. https://www.planetbike.com/store/pro...t-bracket.html

I have one attached to a Racktime rack. Works great.
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Old 10-15-18, 05:47 PM
  #25  
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These are pretty cool if you have M6 threaded brake posts:



https://store.oceanaircycles.com/pro...-light-adapter


or this will work with any threaded braze-on you may have (M5 I think):



https://problemsolversbike.com/produ...mounts_-_27182


Or this is for a front rack - might work with a rear rack?:



https://problemsolversbike.com/produ...mount_-_271821
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