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PostPosted: Tue Mar 05, 2013 3:08 am 
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this is f-ing amazing

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PostPosted: Tue Mar 05, 2013 2:15 pm 
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Location: Dutchess County, NY
Once again, credit goes to Donald as it was on his bike in the gallery where I saw this (he's already chimed in). For now I have a nice light set that works well. Finding the right tubes to make it look better will probably be a summer project, as I'm not working then and I'll have the time to tinker.

And hey, only 1 troll showed up on this topic (not talking about you fde, I thought that was funny).

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Posted: Tue Mar 05, 2013 2:15 pm 


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PostPosted: Tue Mar 05, 2013 2:36 pm 
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Nice! I've seen Donald's bike and it seemed fine there. When (if) my BTP hoods wear out this will be my next approach.

But no need to waste a new tube in the effort. Any shop has a pile of old flats they would donate to the cause.

Inner tubes also make great elastic straps. I cut sections off unpatchable tubes when I want to tie things down for various reasons. I cut unpatchable tubes at the valve first to make sure I don't accidentally try to use one as a spare.

It would be interesting to see how latex compares with butyl.

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PostPosted: Tue Mar 05, 2013 3:11 pm 
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djconnel wrote:
It would be interesting to see how latex compares with butyl.



Depends on what color you were looking for-- latex tends to be some interesting pinks and greens!


gotta go watch my extralite chainrings tick off the last few minutes on ebay!

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PostPosted: Wed Mar 06, 2013 12:01 am 
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Location: Belgium
Hi,

Interesting pinks and greens aside, latex inner tube cuts won't last that long as they age rapidly when exposed to U.V light.
Still, I guess its one way to recycle that pile of shot latex inner tubes..... :lol:

Cheers, ;)

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PostPosted: Wed Mar 06, 2013 2:37 am 
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fdegrove wrote:
Hi,

Interesting pinks and greens aside, latex inner tube cuts won't last that long as they age rapidly when exposed to U.V light.
Still, I guess its one way to recycle that pile of shot latex inner tubes..... :lol:

Cheers, ;)


Can't you repair them by sacrificing one to create the patches?

A cream Vredestein on your hoods though could look quite interesting, could be hard to match bar tape though.

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PostPosted: Wed Mar 06, 2013 11:15 am 
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Hi,

Sure you can repair most but sometimes one gets torn up (sidewall blowout or something similar) well beyond repair.

Ciao, ;)

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PostPosted: Fri Mar 08, 2013 10:56 pm 
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So I'm giving this a test ride tomorrow (180mi, 11k') and will report on how they fare over a variety of conditions. I am using 3" pieces off of an 'ultra-lite' 26x1.95-2.25 tube, they weigh 5.40g each - just a bit heavier than the hoods I've been prototyping for months (they were 4g each, but I'm still working on them).

It took a while, but I managed to get them sans ribbing. That said, it looks like some adjustments in wrapping technique will also need to be made to leave no gaps between the butyl-hoods and the bar tape.

My only concern is that butyl tubes don't last very well under high UV conditions... the rubber degrades substantially.

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PostPosted: Sat Mar 09, 2013 1:20 am 
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Hi,

Quote:
It took a while, but I managed to get them sans ribbing.


:lol:

Nice try though, :)

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PostPosted: Sat Mar 09, 2013 2:22 am 
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any tricks to get them on? rubbing alcohol? talcum powder? were you able to get them on without removing the shifters from the bars?

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PostPosted: Sat Mar 09, 2013 4:00 am 
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I used rubbing alcohol one one side, nothing on the other (tubes have powder on their interior auto-magically) - either way made no difference.
It took several attempts but I finally got a 'cut' shape that works pretty well for SRAM (pre-2013) lever body shapes and merges onto the hood all without any folds or ribs.
I'll be using this on tomorrow's ride
I took pictures of the before/after (including the no-ribbing part - just for you my Belgium friend) and a review/etc:. Right now just excited that they work. The look is... well... you know how some people have a latex fetish and like their partners in tight, latex rubber clothes that conform to the body in the extreme? The hoods look like that. :lol:

More later. Off to a pot-luck dinner party now.

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PostPosted: Sun Mar 10, 2013 4:51 am 
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Location: san francisco ca. usa
The thinner the tube, the more it stretches. A very thin 26 x 1.75 is a good size, and is eaiser to install, also it is lighter. One can trim excess tube after it is installed and helps to get the right shape. Then put some auto rubber/vinyl protectant on. But they do last quite a long time.


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PostPosted: Sun Mar 10, 2013 9:28 am 
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prendrefeu wrote:
My only concern is that butyl tubes don't last very well under high UV conditions... the rubber degrades substantially.


I knew there must be some advantage to living in the UK, my homemade inner tube hoods are gonna last forever :lol:

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PostPosted: Tue Mar 12, 2013 3:53 am 
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Location: Downtown Los Angeles, CA
Any ride update Prend?

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PostPosted: Sat Mar 16, 2013 12:21 am 
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Sorry for the 4 days delay RyanH, here we go: an update.

Last I checked in I was testing out this concept on a rather long ride. Below is some documentation about the cuts, the before, the after, some general thoughts on this.

To start, I used an "ultralite" Performance-branded 26x1.95-2.25 tube, they weigh 5.40g each after the cut was made. Below is the cut that came out with the best possible 'shape' for SRAM levers, pre-2012. While not entirely perfect, this is as far as I got with the shape and it works pretty well for the most part. I'm interested to see if anyone else comes up with other shapes that would work better and document accordingly.

Image
The image background is one of my cutting mats, and for scaling purposes the grids are marked at .5" each (apologies for the internationalists on here, I don't have a cutting mat that is gridded in metric).

Installation is hard to document, so I'll do my best to describe it while keeping a straight face...
Image

There are two methods to installing this: with or without alcohol. Rubbing alcohol that is. While the end result may look a bit like a certain genre of fetish that some people may have, I wouldn't necessarily follow their recommendations of getting tight rubber onto a body: in this case you don't want it to slip off, it needs to be 'semi-permanent' in a sense. The tube should already have some white powder on the interior, this will help in stretching the tube over the lever body, but not much. For the purposes below, I used rubbing alcohol on the right lever and bare/straight for the left lever.

How to get it on....
I put the tubing on to the hoods already in place on a wrapped bar. In my situation, I have the benefit of a mechanic stand that holds the fork from rotation, but in any case have your bike on a stand and prevent the fork from rotating. This will enable you to get some proper leverage when stretching the rubber on. It's not easy.
My method: facing the body lever, use your two index fingers to reach through the tube from the back (enter through 'pointy side', hook through to the other end. Now really stretch the tube pretty well and slide it over the lever, onto the body as far as you can. At a certain point the tube will catch on the upper end of the body lever. Let this happen, and just pull the rest of the tube along the lever's body towards the handlebar. Flatten it out and there you go.

This is what the end result looks like. See? No ribbing. But I was not very happy with how the front-end of the tube looked on the lever body. Either it stretched too far over and left a bit of mess over the upper lever or it was sort of sticking "out there" and not complying to the body. This is more evident on the 'left' lever below.

Right lever (w/ alcohol installation) - before riding:
Image
Image
Top view:
Image

Left lever (straight, no alcohol installation) - before riding:
Image
I also tried taking that bit of flap and folding it under... it really made no difference:
Image

So how did it go after a nice, decent 180mi ride?
Not so great. I suppose this may be do to my tendency to use the hoods when I climb (I also use the tops of the bars a lot), but I'm certainly not in the drops for most of a ride like that. What was interesting was the difference between the two hoods.

On the right side (installed w/ alcohol), the hood started tearing on its own accord and at some point tore itself a bigger cut on the lower side, rendering its former tightness non-existant. From there it all sort of dissipated really, folding onto itself. I think this happened around mile 100, but I wasn't keeping track of the exact location. It was still very usable all the way home, but not that great of a finish:
Image
Image

On the left side (installed straight), the hood did not tear! But it did fold up quite a bit and was unable to recover its location on the top of the lever body. That said, it did last longer than the right side. I would estimate that the ribbing and folding started to occur around mile 115.
Image

Taking a look at the lever body itself, on the lower side of the body there's a rather sharp corner from the plastic body just as there is a cut away to the inner mechanism. I'm thinking that if someone were to file that down a little bit/make it a softer edge, there's a lower likelihood of tearing. However that does not solve the issue of folding over the length of a ride.


Final notes:
I don't know how these look on Donald's bike in person, but I can only speak/write of my own take on this.
I don't like them too much. They're o.k. I don't mind the look for its qualities (reminds me of Wicked Grounds in SF actually... great coffee), but it isn't a keeper for me. I was not very happy about the 'flap' the hood left and I am intrigued if there is a method to have a cut that prevents this, however I will also note that unless you're staring at the hood itself it is not very noticeable. Those among us who are particularly keen on the 'appearance' of their rig with each ride may want to avoid this tube option until this issue is resolved. The weight is very nice - but still about 1g heavier than the prototypes I've been working on for a while (.....and damnit we're so close to getting that done I swear...). Comfort wise it's ok if you like rubbery grip. I've grown accustomed to a more luxurious touch (the prototypes again) so the rubber feel for me is just... ok and normal, nothing special. As with any particularly light/thin grip, you will be losing the 'padding' and 'comfort' of the stock/standard hoods, you will feel the lever's body a bit more.

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Posted: Sat Mar 16, 2013 12:21 am 


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