Can a multi-geared bike also be fixed?

I'm surprised no one has mentioned this little puppy:
http://www.pearson150.com/single-speed-150.html

it uses the SA 3 speed fixed hub that was mentioned in post #3 of this thread..

Yeah, but what about the Sturmey archer three speed fixed hub? No-one's mentioned that yet have they?

Will no-one ever mention the 2 speed fixed?

Could one of these be fixed?

yeah you drill a hole in to the body and fill it with resin.

Could one of these be fixed?

I would have thought so. The chain is the same length regardless of ratio, so issues with tensioners. Whats the engagement like with those balls?

Theres a clever crankset with an expanding chain ring on a German site somewhere. I think the chain rig is split into four pieces, which all get pushed outwards (pressumbly four teeths worth at a time). I wondered when I saw it if it would be possible to combine it with a sprocket which did the same in reverse. I found it when researching belt drives, but cant find it now.

I would have thought so. The chain is the same length regardless of ratio, so issues with tensioners. Whats the engagement like with those balls?

Technically, although it could be used without a freewheel ratchet, it could never be truly fixed because it is actually a species of viscous coupling in the NuVinci implementation. It slips if the driving/braking load overcomes the shear limit of the transmission fluid, a circumstance quite likely with the high transient loads experienced on a fixie skidder.

Technically, although it could be used without a freewheel ratchet, it could never be truly fixed because it is actually a species of viscous coupling in the NuVinci implementation. It slips if the driving/braking load overcomes the shear limit of the transmission fluid, a circumstance quite likely with the high transient loads experienced on a fixie skidder.

and for humans?

and for humans?

Might not be good for hard-braking.

Might not be good for hard-braking.

ahhh, ok!

Could one of these be fixed?

whats wrong with it?

Erm, yes it can... because my bike can.

I have sliding drops, the whole drops slide... and one of the available drops slides the derailleur at the same time as the wheel:

See?

All fine.

This has lost me a little, this allows you to run fixed by changing the wheel, but with the chain running through a regular derailleur surely you would experience the same issue that Ed describes when skidding or applying pressure backwards.
I dont see how this part ^ allows you to run fixed with a derailleur, doesnt make any sense to my mechanics mind, maybe i've misunderstood what you're saying.

Please explain!

so to switch between fixed/road you'd have to break the chain and run it direct between sprocket and chainring, ignoring the derailleur right?

that bianchi frame is ridiculously nice. want.

This has lost me a little, this allows you to run fixed by changing the wheel, but with the chain running through a regular derailleur surely you would experience the same issue that Ed describes when skidding or applying pressure backwards.
I dont see how this part ^ allows you to run fixed with a derailleur, doesnt make any sense to my mechanics mind, maybe i've misunderstood what you're saying.

Please explain!

Hopefully this helps:
http://www.lfgss.com/thread1790-4.html#post1094863

Whats the engagement like with those balls?

It is actually a species of viscous coupling in the NuVinci implementation. It slips if the driving/braking load overcomes the shear limit of the transmission fluid.

Exactly my query ;)

Hello,

I am just wacky experimenting but is it possible in the whole wide world to have a geared cassette (14 speed or 7/8 speed) but make it fixed. So for example being able to change gears on the bike but having the use of a fixed gear, so when you stop pedalling the rear wheel locks up

thanks

i run fixed bearing jockey wheels on my super record eps so i dont see a problem

good luck m8 =)

Hello,

I am just wacky experimenting but is it possible in the whole wide world to have a geared cassette (14 speed or 7/8 speed) but make it fixed. So for example being able to change gears on the bike but having the use of a fixed gear, so when you stop pedalling the rear wheel locks up

thanks

OMG what the world has been waiting for, why did no one think of this?

It would have been better if you joined and posted this on April 1st.

Or just get a Sturmey Archer 3spd fixed hub.

okay thank you

By all means do this but expect your rear mech to break every time you stop pedalling.

simply run a 1 -1 single-speed setup on your non drive side (so when you stop pedalling it locks up) and your usual geared setup on the driveside.

easy

What hub has room for a cassette on one side and a cog on the other?

Zip-tie your cassette to your spokes. SIMPLE.