3 tabbed sprockets for Hubs - How are they the same? How are they different?

[Miq]

I've been hijacking @Old'n'Slow Bikes sales thread on large 3 tabbed sprockets and am taking some hostages with me to this new thread.

Most of these 3 tabbed hubs have the same spacing for the 3 tabs. There can be differences in the size of the center hole. Bendix hubs have a larger diameter driver so the holes in the Bendix sprockets are 1.415" while most of the others are 1.375".

Please add any 3 tabbed sprocket info to this thread. I've been keeping track of it in a table. Let me know if there are corrections or additions you think we should make to it.

@Oken added a pic of some of the hard to find F&S sprockets that got added to the list.

Here's a pic from @BartRidesEternal of a Mattatuck driver that allows three tabbed sprockets to be used with a New Departure Model D hub.

@WillWork4Parts John, feel free to add any info you determine for the Nankai sprockets/hubs here.

At some point we can talk about the 1/8" vs 3/16" chain width varieties...

@Old'n'Slow Bikes feel free to hijack and cross post here. It's all good.

 

[Miq]

Hard to find Mexico Bendix 22T next to an OG 60s Bendix 16T. Bendix sprockets seem to always be flat. Right?

 

[Miq]

New Departure never used the 3 tabbed design for their hubs. The Model D uses a threaded attachment. The DD 2-speed and Tripl (3D) 3-speed used high tooth count sprockets (since the addtional gears were high gears) with unfortunately different mounts than a 3 tabbed design.
DD

3D (Fattiretrader array) shows the whacky square drive sprocket:

Mattatuck driver makes the Model D hub work with 3 tabbed sprockets if you need to get around this for your ND D hub.

 

[Miq]

Shimano makes a bunch of different 3 tabbed sprockets. Some dished like this 20T

You can orient the dish in or out and the tabs will always align, and you can use the dishing and spacers that come with your hub to adjust the chain line from the chain ring to the hub.

 

[Miq]

@Old'n'Slow Bikes Mike’s sprockets have the 3 tabbed design with large tooth counts. Here is a 24T on my F&S equipped Columbia.

Mike’s sprockets are made out of heavy gauge stainless and look great.

 

[WillWork4Parts]

Bendix RB2 has a 1.4105" diameter driver.

Mattatuck has a 1.3790" diameter driver.

This is the one that surprised me...I was thinking I made this free coaster back in the day with 2 Morrow springs, a couple of washers, and a Nankai driver and clutch inside a Bendix 76 hub shell. Newp! I did solve the mystery of where my driver went for the ACS(Suntour) Freecoaster assembly I have. That requires a driver with a threaded insert to retain it. Has a 1.3570" diameter driver.

Bendix on top, Suntour on the bottom.

 

[Miq]

Those match up pretty well to the sizes we have been talking about.

Bendix ~ 1.415"
Mattatuck & ASC Suntour ~ 1.375" (Like SA, F&S, Shimano)

I like your last photo with the right hand sides lined up so you can see the increased diameter of the Bendix clearly on the left hand side. Thanks John.

 

[Miq]

I saw this explanation in a Dutch F&S 515 manual. It shows how the two spacer rings and the dished sprockets can be arranged to provide different offsets to match the chain ring. Google Image Translate did its best but I helped it a little.

Its an edge/cross sectional view of the parts. The longest lines represent the sprocket (dished or flat), the smaller lines are the spacer rings, and the two dots represent the split/spring retainer ring. The center open sections are the center holes that the driver goes through.

 

[Oken]

I saw this explanation in a Dutch F&S 515 manual. It shows how the two spacer rings and the dished sprockets can be arranged to provide different offsets to match the chain ring. Google Image Translate did its best but I helped it a little.

View attachment 2197116

Its an edge/cross sectional view of the parts. The longest lines represent the sprocket (dished or flat), the smaller lines are the spacer rings, and the two dots represent the split/spring retainer ring. The center open sections are the center holes that the driver goes through.

Good point. Many of the Sachs and later SRAM hub diagrams had three chain line measurements shown; for a dished sprocket turned inwards, a flat sprocket, and dished sprocket turned outwards:

 

[Oken]

At some point we can talk about the 1/8" vs 3/16" chain width varieties...

You mean sprockets meant for 1/8" vs 3/32" inside chain width?