I searched the forum and found one thread on adjusting the Vuka, but I still need more help. I can’t seem to get the compression sleeve loose at all. I have tried loosening it and tapping the collet with a screwdriver and hammer to no avail. Short of removing the cables does anyone have any other suggestions. I would like to rotate my bars as right now they are in the 2.5 degree down position. Thanks.
There is a special tool to use to loosen the collet. http://www.zipp.com/accessories/integrated-aero-collet-tool/
I searched the forum and found one thread on adjusting the Vuka, but I still need more help. I can’t seem to get the compression sleeve loose at all. I have tried loosening it and tapping the collet with a screwdriver and hammer to no avail. Short of removing the cables does anyone have any other suggestions. I would like to rotate my bars as right now they are in the 2.5 degree down position. Thanks.
You need a collet tool and a rubber mallet (so you don’t damage or ding the bar or anything else in the event of a stray hit). loosen the retaining bolt until the bolt head is about 1/2 inch behind the base bar. Hit the bolt with the rubber mallet. If you use the collet tool to tighten it and friction paste or electrical tape to improve the slip resistance of the bars, the force needed to push the retaining bolt in can be fairly significant. Don’t be afraid to hit the bolt hard, just make sure you have the bar secured firmly. The cable running out of the bolt make this process harder. I pulled the cables out while I was deciding on the final adjustments so I could repeat this process a little more easily. Wound up just leaving the shift cables running over the base bar instead of through.
Let me know if you have any other questions. I did this a bunch of times adjusting my own fit…
x2. Great description. It’s trickier with the cables in, but not impossible by any means.
You need to hit the collet harder than you think. Probably harder than you are comfortable with, until you figure out just how firm to hit it 
A word to the wise. Once you pop the collet forward, pull your extensions out from the collet just a bit, before you rotate them. The collet will scratch the clear coat pretty good, so you’ll want that to be hidden. Also, unless you really have a specific need for it, don’t take the extension out of the collet. They are a holy pain in the ass to get back in, and they straight up wreck the end of your extensions. Far & away my least favorite part of the bars. I dread re-cabling 
I once watched a mechanic in a high end bike shop adjust those. Took him forever. This is a guy who installs and adjusts them all the time
I do all my own work. As such, I’ve become quite familiar with them. The bars are nice, though not tremendously adjustable. The collets are a nice feature, being able to adjust the extension pitch without moving the basebar, but surprisingly from Zipp, I don’t think my collets are even drilled straight.
My favorite part of the Zipp aerobar arsenal is the VukaShift extensions. They are great when set up. But re-cabling is a headache & lengthly project. Finagling the extensions into the collets, threading the ferrule into the end of an s-bend extension, internally…ugh.
Not to hijack but could you talk a little more about why you like the Vuka Shift extensions? My Vuka aerobar is 5 years old and I have the traditional old style extensions with Dura Ace 7800 bar end shifters. I was thinking of having my tri shop install the new ones. Was also considering the zip shifters.
I would like to hear from someone with personal experience with them
I have an extra set to sell, but this isn’t a sales pitch…
You get rid of the weight of the expansion plug. You also move the actual shifter body further back on the s-bend, so closer to the actual bend. So your hand is able to grip more of the curve, as opposed to the straight part after the curve. Much nicer on the wrists. I also like the shape, there’s a nice beefy part up front to hold onto. I currently have no risers under my pads, the collet tick mark at 6 o’clock (positive rise on extensions), and the extensions rolled inwards. I love it. Being able to change the pitch with the collets, roll them inwards, and micro-adjust the pad height with risers, you’re able to get a great fit.
I think the VukaAero/VukaShift/r2c combo is great.
http://i44.tinypic.com/10g01e0.jpg
I have the tool and loosened it up, just went out and got a rubber mallet. I think the issue before was that I wasn’t hitting it that hard (too scared to), hopefully it works without having to remove the cables. Thanks for the tip on the extensions.
So I got it loose…any hints on how to rotate the sleeve up. From what I understand the timing mark at the 6 o’clock indicates 2.5 degrees down and 12 o’clock is 2.5 degrees up. Mine is currently at the 6 and I would like to adjust it higher up.
Once the collet is popped forward, pull your extension out a bit.
Rotate the extension to where you want it, relative to the collet, then rotate the collet itself.
I just looked at the newest Zipp manual, and I guess they are drilling collets opposite now.
Mine are a few years old and 6 o’clock is a full positive rise. 12 o’clock is negative.
Apparently newer ones are opposite of that. But it should be pretty obvious. Fat part down = extension tilted up.
Thanks, got them adjusted pretty good and they are a lot easier to readjust now after the first time. Thanks for all the help.
No problem. Once you get the adjustment figured out and are happy with the position, map sure you apply some friction paste to the extension. The Vuka’s have been known to slip a little if you don’t use something to help the grip.
This is great stuff, thanks, especially for the photos.
No prob. If you decide you want a set, just let me know.
No prob. If you decide you want a set, just let me know.
I am interested. Are your vulka shifts for shimano? Do you also have the vulkaaero for sale? Thanks Karl
Hello
Looks like you have drilled out the aerobar extension “bullets” on your Vuka setup, and routed cables straight out the back. I was considering making this modification, but did not know if the cables would route through the narrow part of the bullet as they clear the base bar.
Is this mod as straightforward as it looks on your setup? Any advice / tips?
Thanks
Chris
I have a set of Vukashift extensions, for Sram/Zipp R2C
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There is no mod. That’s how VukaAeros work. If you have the Zipp bars, you’re missing something if you think you need to drill…
You don’t have the same setup as this. The Vuka Clips (not the full integrated aerobar, i.e. Vuka Aero) do not allow for cable routing through the back of the extension. I have a pair of those as well, and I don’t see how it is at all possible to route the cables around the base bar clamp and still be internal to the bar.