Shimano Di2 Alfine

Discuss light weight issues concerning road bikes & parts.
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lechat
Posts: 260
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by lechat

These look really nice. Too bad the hubs are so damn heavy.
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mADEAodxQZBx6ICWbhBcELA.jpg (5.01 KiB) Viewed 5468 times

by Weenie


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Tinea Pedis
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by Tinea Pedis

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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MattSoutherden
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by MattSoutherden

Snacking on carrot sticks - Where did it all go so wrong?
-
Finsbury Park CC

lechat
Posts: 260
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by lechat

Sorry 'bout that.
Didn't see the BR piece, Just ran across them browsing eBay.

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ras11
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by ras11

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.
:-) Toys-R-Us

racermech
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Joined: Sun Aug 30, 2009 7:31 pm

by racermech

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.

freeloader
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Joined: Mon Dec 31, 2012 5:27 am

by freeloader

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.

KLabs
Posts: 380
Joined: Wed Dec 01, 2010 4:29 am

by KLabs

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 ...

maxxevv
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by maxxevv

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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SWijland
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by SWijland

Those levers look really nice. For a winter bike this would be pretty ideal.

maxxevv
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by maxxevv

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.

KLabs
Posts: 380
Joined: Wed Dec 01, 2010 4:29 am

by KLabs

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 ...

maxxevv
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by maxxevv

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.

by Weenie


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