View Full Version : Thoughts on this shock-mount tail light bracket?

03-08-2016, 2:25 PM
I've got some 2" tail lights that I want to mount cleanly to the bike (a 99 Harley Dyna frame). I also want good visibility to other drivers so the upper shock mount seems like a good candidate. Here's what I've got so far. Any opinions? Better ideas?

This is a rough model of the frame I'm using it to help with design and visualization. I will eventually add a short chopped fender, but it's not in the model yet.

http://i26.photobucket.com/albums/c130/cggorman/Harley/3-8-2016%202-31-37%20PM_zpsddblvlru.png (http://s26.photobucket.com/user/cggorman/media/Harley/3-8-2016%202-31-37%20PM_zpsddblvlru.png.html)

http://i26.photobucket.com/albums/c130/cggorman/Harley/3-8-2016%202-25-09%20PM_zpsgecnc7f5.png (http://s26.photobucket.com/user/cggorman/media/Harley/3-8-2016%202-25-09%20PM_zpsgecnc7f5.png.html)

http://i26.photobucket.com/albums/c130/cggorman/Harley/3-8-2016%202-28-46%20PM_zpsmpxbbuwq.png (http://s26.photobucket.com/user/cggorman/media/Harley/3-8-2016%202-28-46%20PM_zpsmpxbbuwq.png.html)

The lights in question:

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160305_190927_zpsxhz7r5ns.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160305_190927_zpsxhz7r5ns.jpg.html)

Working on custom LED guts...
http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160307_231031_zpsx54yxycg.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160307_231031_zpsx54yxycg.jpg.html)

03-08-2016, 3:29 PM
This may offer a better idea of what I'm thinking...

http://i26.photobucket.com/albums/c130/cggorman/Harley/3-8-2016%204-28-22%20PM_zpslnicjmce.png (http://s26.photobucket.com/user/cggorman/media/Harley/3-8-2016%204-28-22%20PM_zpslnicjmce.png.html)

03-08-2016, 3:53 PM
Those look great for mass production, but have a cheap stamped "bolt on" feel to them.
And i don't much like the bracket on a bracket deal. Maybe make the sub bracket integral Like dis?

Also remember those shocks pivot and need a bit of clearance between the spring covers and your brackets.

03-08-2016, 6:13 PM
Outstanding idea! Can't believe I was target-locked on the adjustable bracket. I'll lay out a new one tomorrow!

03-08-2016, 6:14 PM
Any suggestions to make it look less mass produced?

03-10-2016, 7:45 PM
I made a few changes and bent up a quick-n-dirty prototype from aluminum. I think I want to make it a bit narrower.

I also confirmed that the shock pivots on the rubber bushing. The steel inner sleeve remains static. The bracket seats against that sleeve, so the bracket will remain static.

Thoughts? Disregard the gaps and misalignment. Like I said. Quick and dirty.

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160310_203714_zps2zlvbgk9.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160310_203714_zps2zlvbgk9.jpg.html)

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160310_203624_zpsmritjvk3.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160310_203624_zpsmritjvk3.jpg.html)

03-10-2016, 8:17 PM
i like it. different. just make sure you have clearance through the shocks cycle

03-10-2016, 8:24 PM
Yeah. The full travel only moves the shock a couple degrees but I'll bee sure to allow adequate clearance.

The mockup showede that I can move the light closer to the shock body. The wiring strain relief was my limiting factor and it bends tighter than I originally thought. I'll work up another revision tomorrow if I have time.

03-10-2016, 10:02 PM
what about doing a fork clamp style bracket off the top of the shock? If the shock only changes by a few degrees it shouldnt be an issue with the light. Just a thought

03-11-2016, 6:31 PM
Latest revision. I think this is the one. Opinions? I wish I could justify having something a bit more graceful CNC machined, but after I braze the seams shut, grind it smooth, and paint it black, I think it will do well.

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160311_190017_zpsoqr4yhpe.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160311_190017_zpsoqr4yhpe.jpg.html)
http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160311_190030_zpsdzwfkbgo.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160311_190030_zpsdzwfkbgo.jpg.html)
http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160311_190106_zpspqjck1at.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160311_190106_zpspqjck1at.jpg.html)

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160311_190518_zpsnnolppko.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160311_190518_zpsnnolppko.jpg.html)

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160311_190531_zpsskq4dy1h.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160311_190531_zpsskq4dy1h.jpg.html)

This was taken at late evening. Twilight. About 75 feet back with my car on the right for comparison. Should be hard to miss me!

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160311_190932_zps0w3cfth7.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160311_190932_zps0w3cfth7.jpg.html)

03-12-2016, 10:44 AM
looks good. post a pic of the final product

03-12-2016, 10:57 PM
Turned out nice and clean. You could put some speed holes in the next set.
Maybe Skeleton ize them. Like a girder pattern or something.

03-12-2016, 11:07 PM
I actually did consider drilling holes or cutting truss sections but I wasn't really feeling it. I dunno. Maybe. Holes would match the sprocket and rotor.

I was gonna build the stainless ones today but I couldn't find a bimetal band saw blade anywhere in town. Will have to dig deeper Monday.

03-13-2016, 5:09 PM
Nice work, CG. The brackets definitely clean up and simplify the tail, and those LED inserts look bright as hell!
Since you asked for suggestions here's my humble 2.....
Have you thought of using a button head bolt to mount the light onto the bracket, it would add a clean detail to the outside of them.
Also, while looking at your mock-up pics, I had a thought that bringing the metalwork over the shock mount (between your brackets upper mounting tabs) might look good, as it would hide the shock mount. BUT, my second thought is, doing that could make them look too bulky...... So, I'm not too sure about that idea. Figured I'd share it anyway.
Keep up the good work man, looking forward to seeing the end results!

03-13-2016, 5:19 PM
Thanks for the suggestions. Our heads are in the place. I intended to switch out the hardware for button heads when I put it together for the last time. The hex head was just whatever came with the light.

I also made a few models with the bracket wrapping clear over the top of the shock but the diameter got bigger than I wanted. I'm trying to keep it small. I have some sleeves that I'm working on to cover the inboard nuts and flow up into the seat platform. It could probably be a bit cleaner but I can't weld and don't really want to go re-engineering the frame for this bike. Maybe next time...

03-14-2016, 1:18 PM
Here's the final product in .050" 316 stainless. I still need to do some cleanup and blast them before I paint. They look twisted, but that's just lens distortion.

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160314_151053_zps2ywvbyx3.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160314_151053_zps2ywvbyx3.jpg.html)

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160314_151106_zpsxqfppoqz.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160314_151106_zpsxqfppoqz.jpg.html)

03-14-2016, 7:42 PM
Spent all evening helping my son with his bike, but I did manage to get the brackets cleaned up and ready for paint. Hopefully I can get them sprayed tomorrow.

http://i26.photobucket.com/albums/c130/cggorman/Harley/IMG_20160314_213520_zpstpckpqfm.jpg (http://s26.photobucket.com/user/cggorman/media/Harley/IMG_20160314_213520_zpstpckpqfm.jpg.html)