Dual Ratio Sprocket MK2 - Crazy genius skills.

[CaNsA]

https://www.youtube.com/watch?v=VesK9AOlsno

[_Iain_]

Cool as fuck, but isn't this General Bike Chat & not General Bike Videos?


____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[Copycat73]

if he gets that working reliable.... it will sell.
____________________
Whatever I post I have no citation and no intention of providing one..
caveat emptor

[misscrabstick]

I guess he has some epicyclic gears in the hub somewhere, very clever bit of design, that bloke seems to be a nutter though.

[jjdugen]

As I recall, the racing Honda 50's of the 1960's era had the same idea. Eight speed gearbox with a hub change to give sixteen speeds in all. That was purely mechanical and obviously worked well enough to get Honda the title. Whether it was capable of coping with really high power outputs is another matter.
____________________
The CBR900RR has been sold. Aprilia Falco worms its way into my heart.
Try Soi 23 on Amazon for a good read.... Self promotion? Moi?

[moppy]

Someone explain whats happening here please.

[Pete.]

The concept is not new, just crack open your battery drill gearbox and find the epicyclic gear set inside. The implementation however is very nicely done.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Pete.]

[_Iain_]

[G]

A nice execution, but adds weight at about the worst place you can for handling.

I was hoping it'd be on the output shaft - but that'd be rather tight.

Concept is nothing new, as above - similar systems in electric hub motors, though rarely with the option to change gear.
Also seen the same in unicycles, so you can have a fast unicycle without a big wheel or chains.

There's a few bikes that add a second two stage gearbox between the output shaft and the rear wheel - like the ct110 'postie'.

[stinkwheel]

They have a simpler and much more durable idea for use on single speed mountain bikes. Although not quite as quick on the changeover. It's to allow you to ride your bike out to the trail on higher gearing then go mess about on the rough stuff on lower gearing.

Yerv simple. Dual sprockets. You have two front and two rear sprockets. You ride out on the bigger front and smaller rear sprocket then when you get there, you loosen the rear wheel and move the chain onto the smaller front and larger rear. They are geared in such a way as they use the same number of chain links.

It's made by white insucstries and is called a "double-double" chainset. I'd imagine the idea would translate onto a motorcycle fairly simply without any major engineering.
https://farm3.static.flickr.com/2442/3571025018_c90a63c06a_b.jpg
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[goto10]

Isn't this just a stronger Sturmey Archer hub gear?
____________________
'12 NC700S & '12 CB600F Hornet [Stolen by some dickless twat] Suzuki GT500 shed

[Pete.]

Sturmey Archer have been making planetary gear hubs for a long time. Basic, simple and very effective.

Oops - too slow I see. Shoulda used a different gear
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[_Iain_]

The only issue I can see with that setup on the bike in question is that the guys designed it for a stunt bike setup.

The difference in chain links required between a standard 45ish tooth sprocket & a 70, or even 80 tooth stunt sprocket would be insane. I seriously doubt you'd be able to even adjust the chain to get it rideable when on the smaller rear sprocket
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[G]

[stinkwheel]

[Walloper]

That crude dog clutch is the weak link and wouild be ripped apart, seized with winter road-clag or worn out in no time.
But the principle seems fine.
It is another bit of kit to look for on my next BMW.

They are 'advanced engineering' machines you see.
____________________
W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair