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-   -   Reverse derailleur hanger? (https://www.bikeforums.net/bicycle-mechanics/788974-reverse-derailleur-hanger.html)

CrazyLemurBoy 12-27-11 08:17 PM

Reverse derailleur hanger?
 
Hello all,

I am using an Nuvinci N360 on my Vaya, and so far so good. To get the adequate chain tension, I'm using a Surly Singleator since the Vaya has vertical dropouts (75*). My problem is that when I remove the rear wheel, the axles length on the Nuvinci is so long it hits the tensioner. The tensioner does not want to move out of the way, and frankly it's annoying as hell to use a 6mm hex key and 18mm cone wrench every time I want to remove my rear wheel, in addition to the wrench to remove the axle nuts.

My solution: reverse derailleur hanger. This would put the hanger threads in front of the axle so when I remove the wheel the arm of the tensioner is not in the way. I thought maybe I could flip the Salsa hanger that came with the bike, but the face does not allow for this. Does anyone know of such a contraption?

Here is a pic of the stock hanger: http://images.jensonusa.com/large/fr/fr257z00.jpg

Picture of the issue (not my bike, but the same situation I'm in):
http://lh6.ggpht.com/_LZCDAFzWNew/SS...ekeWinter4.jpg

reptilezs 12-27-11 08:24 PM

dahon

CrazyLemurBoy 12-27-11 08:37 PM

Did some Googling, seems like it will fit the bill. Will the frame and the hanger place nice or is the face of the dahon milled into some kind of pattern that requires a special interface?

fietsbob 12-27-11 10:57 PM

Spring loaded, 2 pulley tensioner , like Paul's melvin. Alfine , or Rohloff, pull back out of the way,
the locked tension snubber shown, has to be loosened somewhere to do similar.

CrazyLemurBoy 12-27-11 11:17 PM

I am aware of the two pulley system that are akin to a derailleur. I really love the look and feel of a straight chain driven bike without the chain wrap of the two pulley system. I would prefer not to go that route.

LarDasse74 12-28-11 12:40 AM

Good luck, then!

reddog3 12-28-11 01:58 AM

You have some thoughts on how to improve the chain tension deal- so try that first. If it were me, since I don't care for add-on tensioners, I'd jiggle front chain ring (one tooth +/-) size and use a half-link if necessary.

CrazyLemurBoy 01-03-12 12:30 AM

I've recently purchased a half link, and the chain is pretty much perfect now. Can I really run this without at tensioner? Ultimately this is the ideal solution but I'm concerned about chain slip over gears under heavy load.

Airburst 01-03-12 11:42 AM


Originally Posted by CrazyLemurBoy (Post 13669585)
I've recently purchased a half link, and the chain is pretty much perfect now. Can I really run this without at tensioner? Ultimately this is the ideal solution but I'm concerned about chain slip over gears under heavy load.

Yes, you can, I once had the rear wheel slip on an IGH bike to the point where the chain had about an inch of vertical play, and it didn't skip. It fell off when I hit bumps, but when it wasn't doing that, it was driving the sprocket fine, and I was able to ride the 4 miles home.

CrazyLemurBoy 01-03-12 01:55 PM

You see... it doesn't fall off right now and I would prefer it not to. I'll try it without the tensioner and report back the results.

LarDasse74 01-03-12 04:11 PM

Look for pictures of people riding bikes ~50 years ago. You can get away with a pretty loose chain by modern standards if your chainline is correct.

CrazyLemurBoy 01-04-12 11:54 PM

Update - I took of the tensioner, and it works fine! Using the half link to get the 'magic gear,' my chain is perfectly tensioned. In fact, it's a bit tighter than my derailleur bike. According to the late great Sheldon Brown, I'm looking for 1/2" of deflection at the mid point of the chain. I'm getting about 3/8" so I think it will be fine. My chainline is off by about 1.5 mm so time will tell if it will fall off. I'm buying a longer spindled BB soon to correct the chainline issue. I'm very surprised, on my 16 mile commute today the bike was more silent than ever.


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