Double Chain

[Dudd]

Humour me.

If you had a flip flop hub.
Two drive side cranks.
Two Chains of equal length
Two Matching Chain rings
Two matching rear cogs

Could you make a bike with double chain work?

I can't see how it would fail, but i've never seen it.

[Master Mischief]

The chain length and individual cog sizes would make no difference. As long as the ratio (gear) were the same and you had some sort of tensioner on each side then it would (in theory) work.

The problems would be:

Finding a left hand chain tensioner.
Finding a left hand freewheel.
Building a very narrow wheel to allow room for the double drive sides.

You could fix the above by making it a fixed wheel, single speed. Chain length (but not individual cog sizes) would then become important. It would be easier for eual chain tension to use the same cogs but not essential. The problem would be finding / making the hub.

I have to ask why as the only benefit that I can see is chain failure resilience?

Jon

[SystemParanoia]

as a fixie, yes you could do it.

ive ordered some cogs from velosolo that bold onto the disk brake mount.

if you fit another cog onto the normal side, you then have dual fixed cogs that you can mount chains too.

although it would be such a simple task if you wanted gears or freewheel on both sides

[mchammer89]

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

[SystemParanoia]

[shakotan]

From the 'pimped out fixie' thread...

[Mr.Jimbo]

wow, I want that chain.

Even just the one would do me

[prand]

what's the point of two chains?

[BermyAndy]

Is it just me, or does that double chain photo look like he's about to go to a triple?

[dave_s13]

prand said:

what's the point of two chains?

I want to know this too?

Is it just cos he's strong as fook and keeps snapping them?

[AnotherClarkey]

mchammer89 said:

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

That is just magnificent! I can't imagine how strange it must look and feel pedaling serenely backwards uphill. How much power can you actually generate like that I wonder? Must use completely different muscles too - is it actually good for you?

[arryb]

POOOOOOOWWWWEEEEEEEERRRRRRRRRRRRRR!!!

[mchammer89]

AnotherClarkey said:

mchammer89 said:

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

That is just magnificent! I can't imagine how strange it must look and feel pedaling serenely backwards uphill. How much power can you actually generate like that I wonder? Must use completely different muscles too - is it actually good for you?

Well sir, you no longer have to imagine! Here you go http://vimeo.com/groups/bikesinnit/videos/1303789

[dtmpower]

I have recently visited Japan. Where bike culture has embraced both singlespeed/fixed bikes and the mini velo style racers.

I managed to pick up a picture book called Pedal Speed which is a bike culture book showing bike projects from around the globe, but mostly Japan and the US.

Among the many composite/single arm/single fork projects is a double chain ring bike as mentioned in this thread. So I thought I would scan and host the picture. Let me know if you want to see any more images form the book and I will scan and host them.



Sorry for the large image but it's needed to see the detail in the sub pictures of the double sided cranks and chain ring. <click on image for detailed zoomed view>

Edited by dtmpower on Wednesday 3rd June 09:40

[AnotherClarkey]

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

That is just magnificent! I can't imagine how strange it must look and feel pedaling serenely backwards uphill. How much power can you actually generate like that I wonder? Must use completely different muscles too - is it actually good for you?

Well sir, you no longer have to imagine! Here you go http://vimeo.com/groups/bikesinnit/videos/1303789

Many thanks, that was most excellent. Will a bike like this coast or is it effectively fixed with the opposing freewheels? I can't quite work it out but the bloke in the video said that it was 'as fast downhill as a normal bike' so I imagine it must.

[mchammer89]

AnotherClarkey said:

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

That is just magnificent! I can't imagine how strange it must look and feel pedaling serenely backwards uphill. How much power can you actually generate like that I wonder? Must use completely different muscles too - is it actually good for you?

Well sir, you no longer have to imagine! Here you go http://vimeo.com/groups/bikesinnit/videos/1303789

Many thanks, that was most excellent. Will a bike like this coast or is it effectively fixed with the opposing freewheels? I can't quite work it out but the bloke in the video said that it was 'as fast downhill as a normal bike' so I imagine it must.

Yeah that'll coast, it confused me at first too but it's just like a normal road bike with two gears, except it looks fecking awesome, i'd love to get one just to pedal around backwards

Edited by mchammer89 on Wednesday 3rd June 10:57

[dtmpower]

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

That is just magnificent! I can't imagine how strange it must look and feel pedaling serenely backwards uphill. How much power can you actually generate like that I wonder? Must use completely different muscles too - is it actually good for you?

Well sir, you no longer have to imagine! Here you go http://vimeo.com/groups/bikesinnit/videos/1303789

Many thanks, that was most excellent. Will a bike like this coast or is it effectively fixed with the opposing freewheels? I can't quite work it out but the bloke in the video said that it was 'as fast downhill as a normal bike' so I imagine it must.

Yeah that'll coast, it confused me at first too but it's just like a normal road bike with two gears, except it looks fecking awesome, i'd love to get one just to pedal around backwards

Edited by mchammer89 on Wednesday 3rd June 10:57

I still can't work out what happens when you pedal... forwards > I guess the smaller cog overdrives the larger cog's freewheel... but when you pedal backwards I get confused...

[mchammer89]

dtmpower said:

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

That is just magnificent! I can't imagine how strange it must look and feel pedaling serenely backwards uphill. How much power can you actually generate like that I wonder? Must use completely different muscles too - is it actually good for you?

Well sir, you no longer have to imagine! Here you go http://vimeo.com/groups/bikesinnit/videos/1303789

Many thanks, that was most excellent. Will a bike like this coast or is it effectively fixed with the opposing freewheels? I can't quite work it out but the bloke in the video said that it was 'as fast downhill as a normal bike' so I imagine it must.

Yeah that'll coast, it confused me at first too but it's just like a normal road bike with two gears, except it looks fecking awesome, i'd love to get one just to pedal around backwards

Edited by mchammer89 on Wednesday 3rd June 10:57

I still can't work out what happens when you pedal... forwards > I guess the smaller cog overdrives the larger cog's freewheel... but when you pedal backwards I get confused...

Nono, the freewheels rotate in opposite directions, so when you pedal forwards, the small cog is driving forwards, while the large one freewheels backwards, and the reverse happens when you pedal backwards.

[dtmpower]

mchammer89 said:

dtmpower said:

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

AnotherClarkey said:

mchammer89 said:

Yeah it would work, but it would only cause more wear, however, on topic of two gears, I give you this:



Two freewheels on the rear hub, that spin in opposite directions, pedal forwards to engage the small one for normal riding, pedal backwards to engage the large gear for getting up hills, would love to build one of those.

That is just magnificent! I can't imagine how strange it must look and feel pedaling serenely backwards uphill. How much power can you actually generate like that I wonder? Must use completely different muscles too - is it actually good for you?

Well sir, you no longer have to imagine! Here you go http://vimeo.com/groups/bikesinnit/videos/1303789

Many thanks, that was most excellent. Will a bike like this coast or is it effectively fixed with the opposing freewheels? I can't quite work it out but the bloke in the video said that it was 'as fast downhill as a normal bike' so I imagine it must.

Yeah that'll coast, it confused me at first too but it's just like a normal road bike with two gears, except it looks fecking awesome, i'd love to get one just to pedal around backwards

Edited by mchammer89 on Wednesday 3rd June 10:57

I still can't work out what happens when you pedal... forwards > I guess the smaller cog overdrives the larger cog's freewheel... but when you pedal backwards I get confused...

Nono, the freewheels rotate in opposite directions, so when you pedal forwards, the small cog is driving forwards, while the large one freewheels backwards, and the reverse happens when you pedal backwards.

I get it now - I forgot that they run in opposite directions

Forward = gear 1 (gear 2 freewheeling)
Backwards = gear 2 (gear 1 freewheeling)

[mchammer89]

Yep that's it, so simple, but genius