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-   -   Shimano Nexus 4 speed hub / Mezzo I4 (http://www.bikeforums.net/folding-bikes/725134-shimano-nexus-4-speed-hub-mezzo-i4.html)

chagzuki 04-04-11 12:06 PM

Shimano Nexus 4 speed hub / Mezzo I4
 
When was the 4 speed hub discontinued? I can't find much info on it on the web yet Mezzo appear to continue to use it on one of their bikes.

Anyone know the specs, gear ratios/weight?

fietsbob 04-04-11 12:34 PM

Quote:

Anyone know the .., gear ratios .. ?
http://sheldonbrown.com/gears/internal.html

rcschafer 04-04-11 02:26 PM

You can still find installation and maintenance PDFs on the Shimano site that appear to cover everything except what you're asking :crash:

Wait, here you go: Gear Hub Specs

Gear Ratio: 1.00 (1st), 1.244 (2nd), 1.50 (3rd), 1.843 (4th)
Weight: 1700g for the Nexus SG-4C35 (coaster brake), 1370g for the Nexus SG-4R35 (roller brake.)

chagzuki 04-04-11 03:49 PM

Thanks, not seen that website before, very useful.

So it only came in brake versions?

Dynocoaster 04-04-11 06:07 PM

My Mezzo doesnt have a brake integrated with the hub.

chagzuki 04-04-11 06:12 PM

I'm not really following Shimano's product range system. The Nexus 7 hub seems only to come in coaster or roller brake format too. . . whereas the 8 clearly has 3 permutations, one specifically for rim brakes.

Dynocoaster 04-04-11 06:47 PM

Are you interested in the I4 or the Mezzo with an I4?

fietsbob 04-04-11 07:59 PM

Quote:

Gear Ratio: 1.00 (1st), 1.244 (2nd), 1.50 (3rd), 1.843 (4th)
Does sound like a good small wheel bike IG hub, set up the sprocket ratio for low
and the overdrive gears make all the higher gears.

folderfan550 04-05-11 12:36 AM

The roller brake is a separate unit which bolts onto the left side of the hub. The brake engages with splines on the hub. The Nexus 4-speed and 7-speed hubs use the same types of roller brake. I have a bike which came with the Nexus 7-speed and rim brakes. I later added a roller brake to replace the rear rim brake. Some hubs with no roller brake came with a plastic cover that fits over the splines.

chagzuki 04-05-11 02:19 AM

I'm interested in the hub, Dynocoaster. I mention Mezzo as it seems the hub is still in use for those bikes only, and I figured there must be Mezzo riders on this forum who have the 4 speed model and can offer opinions on the hub.

I guess that means that the weight disparity, 1700g for coaster vs 1370g for roller, is due to the fact that that doesn't include the roller brake unit. . . in which case it's not a particularly light hub.

But otherwise it does sound good for folders; evenly spaced gears and allowing the usage of a small chainring.

rcschafer 04-05-11 05:44 AM

I installed the coaster brake model on a mixte and am happy with it; even with 700c wheels it's still a pretty usable range of gears (it's very flat where I am.)

One note: the Nexus-4 shifters are a little harder to find these days and don't typically come with the hub. I have a trigger shifter and it works well on upright bars; the twist shifters are more common (there's one on eBay now for $30 but I read somewhere that they might be less durable.

bhkyte 04-05-11 01:45 PM

Most mezzo i4 users report than its still under geared.


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