2 Speed SRAM Automatic Hub

[FreddyS]

Bought a really cool Dynoglide from a forum member and was thinking of dropping a 3 Speed hub but also considering a 2 Speed SRAM automatic. Hub is 120 mm over the locknut. Does anyone have any experience with this hub? Will it fit on my late '90s Dynoglide? Can you share?


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[Dr. Tankenstein]

I have one installed in a resto-mod that's in my build pipeline, so I haven't ridden it yet.
I believe member 'Wildcat' has some experience with them.


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[Wildcat]

I had two of them, one with coaster and one freewheel. They are still at a good price on Amazon, and there's a lot of reviews and questions answered on that page.

I'm moving to Hawaii so they both were on bikes that had to be sold recently, otherwise I would have kept them.

They come with spacers to fit different size frames.
#5 on this diagram, not the lockring.

Without the spacers, it's 120mm, with them is 130mm width. I don't know what the Dyno's width is, but I'm fairly sure it's wide enough, or if it's more than 130mm, there's room for more spacers on the Sram axle. They come with internally geared hubs, so I think you'll be ok.

 

[FreddyS]

I had two of them, one with coaster and one freewheel. They are still at a good priceon Amazon, and there's a lot of reviews and questions answered on that page.

I'm moving to Hawaii so they both were on bikes that had to be sold recently, otherwise i would have kept them.

They come with spacers to fit different size frames.
#5 on this diagram, not the lockring.

Without the spacers, it's 120mm, with is 130mm width. I don't know what the Dyno's width is, but I'm fairly sure it's wide enough, or if it's more than 130mm, there's room for more spacers on the Sram axle. They come with internally geared hubs, so I think you'll be ok.

Awesome!

Thanks for the info! The bike has some really nice lines that I would like to keep that way without the cable and shifter. Saw one on EBay shipped for $ 64 which looks like a very good price. Ordering one now.

Thanks again!


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[Wildcat]

That's a good price too. With the hubs gearing setup, and your Dyno's 44 tooth chain wheel, you'll have a normal gear, and a high gear that will kick in at about 11 mph. It should be just about perfect for a cruiser.
It's automatic shifting but I noticed a couple things. If you hit a good bump, it will sometimes go to high gear because the centrifugal weight moves outward. Just let off for a second and it'll go back to low.
Second, if you are in high gear, you can hold it in high if you don't let off the pedals as you slow down. That what's I did when I wanted to cruise along at about 8-10 mph without pedaling at a higher cadence. Once you take the weight off the pedal, it'll drop into low.

 

[FreddyS]

One last question. If I buy a bare 2 speed hub can I use the cog and existing coaster brake with it?


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[Wildcat]

One last question. If I buy a bare 2 speed hub can I use the cog and existing coaster brake with it?


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I don't quite understand the question.
The freewheel version and coaster version both use the same hubshell. The coaster parts are replaced with a plastic spacer in the freewheel version. I was able to swap the guts from one wheel to the other when I wanted coaster brakes on my other bike.

 

[FreddyS]

You answered my questions. Some kits come with everything including a new cog and coaster brake. Some come without the cog and brake. I would like to use the cog and brake that is on the bike now.


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[Wildcat]

They all should come with the cog, both of mine did. Ready to go except for the strap that holds the brake arm to the bike. I think it's an 18 tooth cog, but most others from other brands fit also. I put a 22 on one just to try a super low gear.
So you should be ready to put your wheel together, most of the hubs are 36 spoke. Post it up when you get it together!

 

[Wildcat]

I just thought of something. Did your Dyno originally have an internally geared hub? That would ensure your chain ring is compatible with the SRAM cog. If your Dyno had a derailleur, the chain might be different, but it's easy to check, just see if the chain sits correctly on the cog and chain wheel. also, the dropouts should allow adjustment of the axle back and forth for chain tension.