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Old 04-15-08, 03:52 PM   #1
d2create
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Internal Gear Hub questions

I did a search put had trouble finding answers to my questions.

Mainly, are the newer hubs by sachs or nuvinci made to make tire changing fairly painless?
My father's electra townie got a flat so I helped him change it and OMG, what a major pain in the butt that was. Too many little parts and tools needed (and studying instructions) to get that thing off/on.

Are there any comparo's between the sach's i-motion 9 and the nuvinci?
I understand the new technology being used in the nuvinci, but thinking more of other things like installation, parts needed for the conversion, total cost when said and done, etc.

I'm thinking of converting my Rivendell to an internal geared hub.
Mainly I want one gear up front and then that coupled with whatever the middle position is on the rear hub should be the same gear ratio as my current single speed. Houston is so flat that I rarely change gears on the Rivendell during my commute. But don't want to get rid of them all together.
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Old 04-15-08, 04:39 PM   #2
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PM Madcap - he has a 29er setup with a nuvinci

http://www.bikeforums.net/members/madcap-87583.html

http://www.bikeforums.net/commuting/387603-newest-revision-my-commuter.html#post6157401
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Old 04-15-08, 05:40 PM   #3
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By far the easiest wheel removal is on the I-Motion 9. Shift to 1st gear, pull the quick release, and remove clickstick from the connector.

The prior Sram/Sachs hubs (P5 and S7) used a clickbox that was easy remove, but easy to break sitting outside the chainstay.

No experience with Nuvinci, but there are a few videos on youtube:
http://www.youtube.com/watch?v=NrJcptCzahc

http://www.youtube.com/watch?v=2Utm0...eature=related
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Old 04-15-08, 05:49 PM   #4
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Shimano Alfine isn't the easiest in the world, but not the hardest, either.

Shift down to loosen the cable, pull the cable slack with your hand, and pop the cable nut out of the hub's retainer (a little finicky the first time or two, but it doesn't take tools, and is quick once you get it). Then just loosen the nuts, and drop the hub out. Reinstallation is quick too.

The ones that really take time are units that attach to the chainstay, if they have drum or roller brakes, for instance.

-Sam
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Old 04-15-08, 07:27 PM   #5
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airfree tires would be a great solution for your father townie.
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Old 04-15-08, 10:27 PM   #6
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Quote:
Originally Posted by d2create View Post
I did a search put had trouble finding answers to my questions.

I'm thinking of converting my Rivendell to an internal geared hub.
Another question to consider if you haven't already is how you are going to adjust the chain. The atlantis has verticle dropouts. I like the idea of an internal gear Rivy, but don't let Grant find out about it. He thinks internal gear hubs are extreme!
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Old 04-16-08, 05:49 AM   #7
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Well, there is the Rivendell Quickbeam with horizontal dropouts.
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Old 04-16-08, 06:32 AM   #8
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I've got the Nexus 7 speed hub and it's pretty easy to change. Doesn't take any time, if you can see the dang thing. There's an oval nut that has to be rotated to fit through a slot. Plus it's in an area of the bike that gets very greasy.

Anyhow, I manage fine with my reading glasses on and a good light. Note that removal isn't needed for tire changeout. The wheel comes off easily enough, with room to spare to get the tire off without disconnecting the hub. This is important, since tires tend to go flat when you're riding and when the weather is wet.

Get good quality kevlar lined tires. I got Schwalbe Marathon's. No flats for a year and a half now.
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Old 04-16-08, 07:36 AM   #9
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airfree tires would be a great solution for your father's townie.
+1 With higher level psi than what he runs now.
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Old 04-16-08, 07:39 AM   #10
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Another question to consider if you haven't already is how you are going to adjust the chain. The atlantis has verticle dropouts.
hmmmm... didn't think of that.
Chain tensioner???
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Old 04-16-08, 10:16 AM   #11
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Quote:
Originally Posted by K6-III View Post
The prior Sram/Sachs hubs (P5 and S7) used a clickbox that was easy remove, but easy to break sitting outside the chainstay.
Easy to break? Ever break one? What makes you think that is true under normal conditions? I don't think so and I've been using a Sachs Spectro7 with a clickbox daily for over six years.
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Old 04-16-08, 11:49 AM   #12
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I've been running a NuVinci for a good while in my Longtail.
It's not a quick-release, so you have to use a wrench to loosen the axel nut.
After that the shifter box pops off with ease.
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Old 04-16-08, 02:29 PM   #13
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Easy to break? Ever break one? What makes you think that is true under normal conditions? I don't think so and I've been using a Sachs Spectro7 with a clickbox daily for over six years.
With the included clickbox protector, it is fairly safe. Yet, it is more exposed than other shift systems and thus more vulnerable.
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Old 04-16-08, 03:22 PM   #14
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Originally Posted by K6-III View Post
With the included clickbox protector, it is fairly safe. Yet, it is more exposed than other shift systems and thus more vulnerable.
IMO, and in my experience with this system, a component (like the SRAM/Sachs clickbox) that is theoretically "more vulnerable" is not necessarily "easy to break." I would put that alleged vulnerability very low on list of things to be concerned about when selecting a hub system.
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Old 04-16-08, 04:07 PM   #15
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The I-motion 9 has a quick release? If so, I'm sold.
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Old 04-16-08, 05:20 PM   #16
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The I-motion 9 has a quick release? If so, I'm sold.
Not that I've seen. All the images, even the carbon one, have a solid axel.
To my knowledge the Rohloff is still the only IGH with a quick release option.
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Old 04-16-08, 07:13 PM   #17
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hmmmm... didn't think of that.
Chain tensioner???
That will work. But to me the tensioner looks just like a derailleur hanging down there, so you might as well just run a derailleur. It is your bike though. One other option is the trickstuff eccentric bottom bracket. It is pretty pricey, but you rivendell guys have the deep pockets. Give it a look. Only works with hollowtech II type bottom brackets though. Grant would have a heartattack if he knew someone had a gearhub plus a non square taper crankset on a rivendell. I think it would be cool. Here's a link.


http://www.bike-mailorder.de/shop/MT...ed::10589.html
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Old 04-16-08, 07:17 PM   #18
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Well, there is the Rivendell Quickbeam with horizontal dropouts.
That is true. But I believe d2create's bike is an Atlantis.
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Old 04-16-08, 07:39 PM   #19
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The Nuvinci isn't easy to change a tire on, but it's not hard once you've done it, and you have to have the right tools. 15mm and a 21mm, torque wrenches suggested. My rear wheel was about $600 when it was done. It looks like there is a newer Nuvinci hub now that is lighter than the one I have, which is my only complaint about mine. I've been riding it for a few months now and it works great.


crazy you mention a Townie, I just finished customizing one that was found with bent bars, cranks, and wheels like it had been ran over. The frame was straight, though. It rides real nice...

Last edited by madcap; 04-16-08 at 07:51 PM.
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Old 04-16-08, 09:12 PM   #20
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hmmmm... didn't think of that.
Chain tensioner???

A chaintensioner and internal hub. This one is an On-One Doofer.
Sorry about the pannier being in the way.


Rohloff tensioner.
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