What kind of rear sprocket needed for a NuVinci hub with SBP shift kit?

Cannonfish

Cannonfish

Member
Hello all,
So I took the plunge and ordered an SBP shift kit and a NuVinici rear hub! The shift kit was a joy to put together and install, and now I'm lacing the NuVinci into a wheel. I noticed that it didn't come with a sprocket on the right side, however, and now I'm a little confused about what kind of sprocket I need.
There is a threaded "adapter" that came very firmly installed on this hub's standard-looking splined freewheel connecter. I can't manually get that threaded adapter off (maybe it's actually part of the hub itself, but it looks like it was just slid into place over the splines).
So my question for any of you guys who are running NuVinci hubs and shift kits is, what type of sprocket are you using? How many teeth - and if, you're using a threaded sprocket, are the threads "metric" or "english"?
Below I'm pasting a link to the sprocket I *think* I need... note that it is actually a freewheel (alternatively, could I use just a simple sprocket without the freewheel part built in?). The options I picked on this page were 17-tooth English threaded:

https://www.universalcycles.com/shopping/product_details.php?id=7023&category=402

My set up is: 67cc Skyhawk with expansion exhaust pipe and some minor porting, running a 10-tooth heavy-duty SBP shifter kit on a Micargi beach cruiser frame with 26" wheels.
Thanks for your advice, and I'll put some pictures up soon!
 
you will want to use a freewheel. if you use a standard sprocket your peddals will turn all the time, even when coasting.
Most hubs that you buy will not come with the freewheel sprocket and you need to buy it separately, and they usually tell you which one to buy.

I forgot the peddal has a freewheel on it already cause its a shift kit.
 
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Cabinfever1977 said:
you will want to use a freewheel. if you use a standard sprocket your peddals will turn all the time, even when coasting.
Most hubs that you buy will not come with the freewheel sprocket and you need to buy it separately, and they usually tell you which one to buy.
Click to expand...

The SBP shift kit comes with a freewheel for the pedal sprockets.
 
Cannonfish said:
Hello all,
So I took the plunge and ordered an SBP shift kit and a NuVinici rear hub! The shift kit was a joy to put together and install, and now I'm lacing the NuVinci into a wheel. I noticed that it didn't come with a sprocket on the right side, however, and now I'm a little confused about what kind of sprocket I need.
There is a threaded "adapter" that came very firmly installed on this hub's standard-looking splined freewheel connecter. I can't manually get that threaded adapter off (maybe it's actually part of the hub itself, but it looks like it was just slid into place over the splines).
So my question for any of you guys who are running NuVinci hubs and shift kits is, what type of sprocket are you using? How many teeth - and if, you're using a threaded sprocket, are the threads "metric" or "english"?
Below I'm pasting a link to the sprocket I *think* I need... note that it is actually a freewheel (alternatively, could I use just a simple sprocket without the freewheel part built in?). The options I picked on this page were 17-tooth English threaded:

https://www.universalcycles.com/shopping/product_details.php?id=7023&category=402

My set up is: 67cc Skyhawk with expansion exhaust pipe and some minor porting, running a 10-tooth heavy-duty SBP shifter kit on a Micargi beach cruiser frame with 26" wheels.
Thanks for your advice, and I'll put some pictures up soon!
Click to expand...

Hi Cannon and welcome to the form.

I would really like to see a close up pic of that threaded adaptor on the NuVinci hub.

I bought a used one with what looks like a new freewheel on it and the adaptor

has about a 1/4" play side to side...POPS
 
Cannon...I would ask the guys at SBP.

I know if it is going off the peddle crank it is supposed to be half of

what it is ...EG: 36 tooth front, 18 tooth rear, But with the shift kit??...POPS
 
Thanks to everybody for their thoughts!

Pops - here is a picture of my freewheel adapter (notice no freewheel on there yet, I've decided to try a 16-tooth but still waiting on the mail). It's very solid - the adapter, splines, and hub all feel like one piece. I did some looking around online and found out that the interior diameter of an English threaded freewheel is 1.37 inches - this is exactly what this adapter measures over its threads. If yours has some play in it, maybe you could contact NuVinci (Fallbrook Technologies) to ask about a replacement adapter?

Let me know how your install goes - I keep getting sidetracked but hopefully I'll be able to get this one up and running in the next week or so.
 

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That threaded thing on the hub is a adapter for a freewheel sprocket and it should come off,after taking off the adapter you can slide a non freewheel sprocket on the spline of the hub,heres a link.
Results Page

If you want to use that adapter or cant get it off you will need a freewheel(i think) sprocket that screws on the hub.
Results Page
 
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An 18 tooth freewheel is what most people seem to like but it all depends on your riding, engine power etc. I think the 16 will work. Unless you are doing a lot of off road riding where a very low gear is required I think you will be fine.

One thing I think would be neat to try is using a fixed cog as was mentioned in the previous post. The front freewheel allows for this. It will also give the ability to bump start which with a standard derailleur and rear freewheel is not possible.
 
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