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2 Nexus questions

Old 12-01-12, 10:11 AM
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2 Nexus questions

Looking for help with Nexus sg 3c-41 coaster brake hub on a 700c wheel. Sheldon and Shimano charts show this hub has either 120 or 127 mm spacing.

Is there a way to tell which dimension applies to a particular hub without measuring (don’t have hub available to measure at the moment)?

I want to install this on a bike with 127 spacing so if it’s the larger size I’m okay. If the hub is the smaller size will I run into any problems or can I just add washer to each side? The info I’ve seen shows 3 different axle lengths (again, don’t have hub available to measure at the moment). Bike on which I want to install has 168 mm axle (which is one of the sizes Shimano lists), but will I run into problems if the hub spacing is not right or the Nexus axle is 175 or 178 mm? The parts diagram shows that axle as a somewhat complicated piece and the fact that it is available in lengths just 3 mm apart indicates to me it that the dimensions are pretty critical.

Any helpful advice appreciated. Thanks.
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Old 12-01-12, 10:41 AM
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I'm a bit confused about what you're looking for. You know you need a 127mm hub to match your frame. And apparently you own or are coming into a hub or wheel so aren't looking to buy.

So why don't you wait until this incoming (assumption) hub arrives and cross the bridge of the (maybe) wrong axle if/when you come to it?
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Old 12-01-12, 11:10 AM
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Originally Posted by okane
Looking for help with Nexus sg 3c-41 coaster brake hub on a 700c wheel. Sheldon and Shimano charts show this hub has either 120 or 127 mm spacing.

Is there a way to tell which dimension applies to a particular hub without measuring (don’t have hub available to measure at the moment)?

I want to install this on a bike with 127 spacing so if it’s the larger size I’m okay. If the hub is the smaller size will I run into any problems or can I just add washer to each side? The info I’ve seen shows 3 different axle lengths (again, don’t have hub available to measure at the moment). Bike on which I want to install has 168 mm axle (which is one of the sizes Shimano lists), but will I run into problems if the hub spacing is not right or the Nexus axle is 175 or 178 mm? The parts diagram shows that axle as a somewhat complicated piece and the fact that it is available in lengths just 3 mm apart indicates to me it that the dimensions are pretty critical.

Any helpful advice appreciated. Thanks.
Almost every time that I am handed the Nexus sg 3c-41 for a build, it is the 127mm version. Chances are pretty good that it'll be just that.

Fingers crossed...

=8-)
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Old 12-01-12, 06:46 PM
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So why don't you wait until this incoming (assumption) hub arrives and cross the bridge of the (maybe) wrong axle if/when you come to it?

Purchase is dependent upon being able to fit wheel to bike and I'm not sure seller's measurement(120m/m) is correct (typically a novice can't even measure a frame size correcly). Hate to drive an hour to find out it won't work with my bike. They reason for my questions is if it is indeed 120,is it still useable for my applicatiion.

MrRabbit....would a coaster brake hub tend to be the smaller size or are all 3c-41 hubs coaster brakes. Thanks again

Last edited by okane; 12-01-12 at 06:51 PM.
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Old 12-01-12, 07:42 PM
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Most single coaster brakes I work with are 109-110mm.

Most 3-speed coaster brakes I work with are 127-130mm.

I've also run into 3-speed non-coaster that will be 119-130mm.

However you'll find Bramrton and Sturmey Archer 3-speeds that'll be as small as 106mm.

=8-)

https://www.mrrabbit.net/wheelsbyflemingapplications.php

Grab the spreadsheet...view the spokechart tab...scroll through all the hub vendors and you'll a wide variety in OLD for 3-speed and coaster 3-speeds.

=8-)
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5000+ wheels built since 1984...

Disclaimer:

1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:

Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life
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