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 Post subject: Shimano Di2 Alfine
PostPosted: Mon Dec 31, 2012 12:45 pm 
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Joined: Thu Sep 30, 2010 3:32 pm
Posts: 260
Location: S.E. TN
These look really nice. Too bad the hubs are so damn heavy.
Attachment:
mADEAodxQZBx6ICWbhBcELA.jpg
mADEAodxQZBx6ICWbhBcELA.jpg [ 5.01 KiB | Viewed 4640 times ]


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 Post subject: Re: IGH
PostPosted: Mon Dec 31, 2012 1:06 pm 
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Posts: 8221
Location: Geelong
Sorry, I have no idea what you are referring to.

Can you make your post/thread title a little less ambiguous please.

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 Post subject: Re: IGH
PostPosted: Mon Dec 31, 2012 1:16 pm 
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Location: London
Probably this:

http://www.bikeradar.com/news/article/s ... res-33229/

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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Tue Jan 01, 2013 6:21 am 
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Joined: Thu Sep 30, 2010 3:32 pm
Posts: 260
Location: S.E. TN
Sorry 'bout that.
Didn't see the BR piece, Just ran across them browsing eBay.


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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Tue Jan 01, 2013 2:52 pm 
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Joined: Thu Sep 25, 2003 9:11 pm
Posts: 855
Location: SC, USA
I was very excited last year when they announced this group set for a travel/winter trainer I had in mind. With the 1600+g hub weight, and 135mm rear axel, it would be a hard sell for me now.

Like the nuvinchi hub before, the internal geared hub technology still has some distance to go IMHO.

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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Tue Jan 01, 2013 5:01 pm 
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Joined: Sun Aug 30, 2009 7:31 pm
Posts: 211
I wonder what the gear range is like? 11-23 or more like a 12-27? Could build up to be a pretty fun bike depending on the ratios.


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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Wed Jan 02, 2013 3:57 am 
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Joined: Mon Dec 31, 2012 5:27 am
Posts: 46
ras11 wrote:
I was very excited last year when they announced this group set for a travel/winter trainer I had in mind. With the 1600+g hub weight, and 135mm rear axel, it would be a hard sell for me now.

Like the nuvinchi hub before, the internal geared hub technology still has some distance to go IMHO.


There's some improvement they can made. The motor unit looks bulky and heavy to me.


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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Wed Jan 02, 2013 4:28 am 
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Joined: Wed Dec 01, 2010 4:29 am
Posts: 373
racermech wrote:
I wonder what the gear range is like? 11-23 or more like a 12-27? Could build up to be a pretty fun bike depending on the ratios.

I believe 11-38 or 10-36, and at least the hub weight is around the axle, and no dishing/offset issues ...


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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Wed Jan 02, 2013 6:29 am 
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Joined: Wed Feb 09, 2005 4:51 am
Posts: 1846
Alfine 11 supposedly has a 409% total gear range. From 0.53 - 2.153

The conventions are a little different from normal cassette stack. But if you configure it to be mated to a 22T fixed cog, it works out to be something like a 10-42 cassette.


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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Wed Jan 02, 2013 1:14 pm 
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Location: The Netherlands
Those levers look really nice. For a winter bike this would be pretty ideal.

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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Wed Jan 02, 2013 3:43 pm 
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Joined: Wed Feb 09, 2005 4:51 am
Posts: 1846
It must be noted that Shimano specifically recommends a chainring / sprocket ratio of ~1.9. And not to deviate too far from that. The exact reasons I'm not so sure but probably has a lot to do with the stresses internally.


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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Thu Jan 03, 2013 2:43 am 
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Joined: Wed Dec 01, 2010 4:29 am
Posts: 373
maxxevv wrote:
Alfine 11 supposedly has a 409% total gear range. From 0.53 - 2.153

The conventions are a little different from normal cassette stack. But if you configure it to be mated to a 22T fixed cog, it works out to be something like a 10-42 cassette.

Interesting ... with that range only a single 46T or 48T crankring is necessary ...


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 Post subject: Re: Shimano Di2 Alfine
PostPosted: Thu Jan 03, 2013 3:52 am 
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Joined: Wed Feb 09, 2005 4:51 am
Posts: 1846
But its really useful if and only if weight and overall efficiency are not priorities. Internal geared hubs can be a little draggy compared to their chain and sprocket cousins. Not sure the latest generation's figures, but the older generations can be as much as 10-12% difference in efficiency.

They are however excellent for commuting use as they generally require very little servicing. Even better if used on a quick and compact packing foldie like a Bike Friday Tikit or a Brompton as they eschew the convenience a compact clean fold with none of the (tangled up, dangling chain )issues of normal derailleur systems for these small wheel folding bikes.


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