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Coverting the Nexus hub to "roller"
#1
Hello from the bluegrass state.
I’m contemplating an upgrade to my Shimano Nexus 8sp hub (SG-8C31) but unsure if there are components/ shops for this.
The internal hub has a coaster brake which is irritating to anyone preferring another brake system or the ability to back pedal for crank position.
Can this hub be converted to “roller brake” (I’m guessing a roller brake is a disc or V brake set up, allowing for back peddling).
I didn’t want to attempt a “shade tree mechanic” operation and simply remove the brake arm.
Is this a lost cause?
Thanks……Tom
2011softcruise


“Striker, listen, and you listen close: flying a plane is no different than riding a bicycle, just a lot harder to put baseball cards in the spokes.”
Airplane (1980) – Rex Kramer (Robert Stack)

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#2
Here are some useful links for you to understand what is inside:

http://www.sheldonbrown.com/nexus8/
http://bike.shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.download.-Par50lparsys-0024-downloadFile.html/17)%20Inter%208%20ohaul.pdf
http://www.shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.download.-Par50lparsys-0019-downloadFile.html/12)%20Structure%20and%20Function%203%20Speed.pdf
http://www.sheldonbrown.com/nexus-mech.html

Just disconnecting the brake arm is not going to disconnect the coaster brake, and will cause problems.

I would suggest switching to rim brakes, instead of trying to install the Rollerbrake®. The Rollerbrake® is kinda like a drum brake.
Nigel
  Reply
#3
Thanks Nigel, I'll see whats involved. I didn't understand the term "roller" and should have mentioned my interest in a disc brake set up instead.

The simpliest decision would be to sell my current 8 speed hub and invest in a hub thats already set up for a disc brake.

My current hub works fine so I have to decide whether to tolerate its function or put up the big bucks for what I want.

If there were parts to add to my hub and create the disc brake function then I would consider it but the SG-8C31 is engineered as-is.

Tom
2011softcruise


“Striker, listen, and you listen close: flying a plane is no different than riding a bicycle, just a lot harder to put baseball cards in the spokes.”
Airplane (1980) – Rex Kramer (Robert Stack)

  Reply
#4
Hi Tom;

http://bike.shimano.com/publish/content/global_cycle/en/us/index/products/0/alfine/product.-code-SG-S500.-type-.html

Or maybe a whole bike ready to go:
http://www.swobo.com/catalog/product_info_b.php?cPath=2448_2455
Nigel
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