We have received the HUB-13 samples. I have tested them and am going ahead with production. The HUB-13 is designed to sit between two panels spaced 2.5" apart for the 3" wide tracks. It works the same way as the HUB-11’s do for the 2" wide tracks. I should have them in a weeks or so.
I am ready to work on the 3D Models for these. 
8-Dale
Hi Dale, I’m sending you PDF of the drawing. Thanks!
Here is an image of a Tritrack module built with 3" wide tracks.
E-mail sent! Thanks
Are these universal with the 3" wide tracks as well?
These were designed specifically for the 3" wide tracks. 
Woooo Weeee! nice! 
I like the 3" ers. It looks tough, bad, awesome, killer, major, rad, cool, neat-o.
I wana pair!
For now, back to my BRAT… 
I see you have idler hubs for the 3 inch tracks, but what about the universal hubs for the motor that fit the 3 inch tracks. I can’t see how you could use one without the other.
I have built up a tritrack chassis with the wider idlers and the standard hub and sprocket. It seams to be just fine. I will look into making a wider hub for the driven sprocket. Thanks for the tip.
I really appreciate it Jim. I’ve been waiting for these parts to come along so that I can upgrade my current Tri-Track chassis to a larger, beefier version. I can’t wait to see the new universal hub.
What is the radius of the middle section on that part?
I was wondering if it was possible to integrate / add on some sort of chain sprocket or other drive mechanism to the middle of the ‘idler’, meaning we could put the motor somewhere safe instead of load bearing.
im sure that could be done…atleast withthe large sprockets, just buy a sprockt and bore out the middle to fit around that thing and hook up a chain drive
The hub’s middle diameter is 0.865". The hub was designed for a sprocket to be mounted on each end. I’m not sure if you can do what you are suggesting.
perhaps if you tackweld a gear to the middle of the sprocket it would be able to drive a belt or chane.
That would be tough, it’s Al. I guess TIG would work.
.865"? Excellent!
I know there are sprockets that have a .875" bore. How much of a deterrent does anyone think .01" is going to be (yes, thats rhetorical)
Now all I need is for someone to buy a pair and put a standard 3/16" keyway in them, cause without a mill thats beyond me.
(No, no one buy anything… the track system I have in mind would easily run hundreds of dollars… which I don’t have)
Jim, are these meant to be used with the universal hub or to mount the sprockets without a motor (as in from one piece of lexan to another. Becuase the way I have spaced my sprockets is with two 4mm screws going into the hub and 2 screws going from behind the hub, into the procket and into a 3mm hex which is attached to another sprocket.
Here:
http://i101.photobucket.com/albums/m51/Italian_guy299/TrackSprocket.jpg
http://i101.photobucket.com/albums/m51/Italian_guy299/SprocketSpacing.jpg
The problem with this is, it isn’t very strong, and comes loose often when on rough ground.
It’s early but I’ve read this several times and I am noit sure what you’re asking. If by “these” in the first sentance you mean the HUB-13’a then no I never intended these idler hubs to be used with universal hubs. Not even sure how that would work. I am still trying to work out a solution to building a hub that accomodates spacing the sprockets, and be attachable to a 6mm motor shaft. I have not figured this out yet.
Ahhh, understood. When comparing the hub-13 to my method I was a bit confused. In the meantime however, my method of using the 3mm hex standoffs to increase the width of the sprockets is fine for now.
