Two speed BB?
12-31-04 | 12:53 PM
#1
Thread Starter
無くなった
Joined: Mar 2004
Posts: 5,072
Likes: 0
From: Sci-Fi Wasabi
Bikes: I built the Bianchi track bike back up today.
Two speed BB?
I just found this :
https://derbyking.com/Detail/?n=145
Anyone have any experience with these, know how they work, etc?
https://derbyking.com/Detail/?n=145
Anyone have any experience with these, know how they work, etc?
12-31-04 | 02:41 PM
#2
Wood Licker
Joined: Apr 2002
Posts: 16,966
Likes: 2
From: Whistler,BC
Bikes: Trek Fuel EX 8 27.5 +, 2002 Transition Dirtbag, Kona Roast 2002
No experience but looks interesting. Almost like a roholff in theory but designed around the bb instead of the hub (or in effect doing the same thing nicolai does with a hub but nicolai puts in in the centre of the frame and uses a SS rear wheel)...
I would love more info too, I can think of some applications in downhill if it is strong enough (which I doubt there already isn't enough room for bearings in a standard bb as it is)
I would love more info too, I can think of some applications in downhill if it is strong enough (which I doubt there already isn't enough room for bearings in a standard bb as it is)
12-31-04 | 03:19 PM
#3
coasterbrakelockup
Joined: Nov 2004
Posts: 824
Likes: 0
From: parts unknown
Bikes: surly steamroller w/coaster brake, electra single speed cruiser, specialized rockhopper commuter, no-name single speed folder, 700c ultimate wheel, 24" unicycle, specialized bmx lsd, single seat single speed huffy tandem, pink upsidedown parade bike
Originally Posted by HereNT
I just found this :
https://derbyking.com/Detail/?n=145
Anyone have any experience with these, know how they work, etc?
https://derbyking.com/Detail/?n=145
Anyone have any experience with these, know how they work, etc?
In the manufacturer's faq section they specifically say they will not work on fixed gear bikes. The reverse pressure will esplode them or something. Would be great for a 700c coaster bike, though.
12-31-04 | 05:10 PM
#5
Direct Hit Not Required
Joined: Nov 2003
Posts: 6,193
Likes: 2
From: San Bruno, CA
Bikes: Leopard DC1, Ridley X-Fire, GT Zaskar 9r
Originally Posted by lz4005
There is some info on them at https://www.sheldonbrown.com/harris/schlumpf.html and more if you follow the links to the manufacturer's site. They are an internal planetary gear.
In the manufacturer's faq section they specifically say they will not work on fixed gear bikes. The reverse pressure will esplode them or something. Would be great for a 700c coaster bike, though.
In the manufacturer's faq section they specifically say they will not work on fixed gear bikes. The reverse pressure will esplode them or something. Would be great for a 700c coaster bike, though.
If you meant SS freewheel then that seems OK.
12-31-04 | 08:03 PM
#6
coasterbrakelockup
Joined: Nov 2004
Posts: 824
Likes: 0
From: parts unknown
Bikes: surly steamroller w/coaster brake, electra single speed cruiser, specialized rockhopper commuter, no-name single speed folder, 700c ultimate wheel, 24" unicycle, specialized bmx lsd, single seat single speed huffy tandem, pink upsidedown parade bike
Originally Posted by BlastRadius
Coaster brake? I'd imagine the backward pressure from coaster brakes would do the same exploding.
If you meant SS freewheel then that seems OK.
If you meant SS freewheel then that seems OK.
It sort of makes sense, because the maximum backpressure on a coaster brake is your body weight, compared to your body weight plus the force of your forward momentum (until the skid starts) on a fixed. That would be a lot more, depending on tires, dry road, weight transfer, etc.
Could also have something to do with coasters only back pedaling 1/4 to 1/3 rotation.
I don't know, man, I'm just telling you what the thing says.
Last edited by lz4005; 12-31-04 at 08:10 PM.
