look at this crap from shimano • more complex and ugly

[oldpotatoe]

Everything that's old is 'new' again...and a 'patent' doesn't=production..

And is this leaked? OMG, making whole legions of bicycle rear ders instantly obsolete(sarcasm intended).....

but the consequences are that you've just attempted to devalue millions of dollars of bikes with a single internet post

sigh...

[Mark McM]

Originally Posted by Kwontumspeed

They sure Campy doesn't already own this patent? Looks like a version of the Nuovo Record design of old...

Not quite - this derailleur separates the shifting function from the chain slack take-up function. Most modern derailleurs use a 2 pulley cage located below the cage, which serves two functions: It rotates forward and back to take up chain slack; and it moves laterally to shift the chain between sprockets while at the same time moving vertically to match the changes in sprocket size.

In the new patent, there is a pulley cage with two pulleys that rotates to take up the chain slack; but there is also a 3rd pulley that handles the shifting/sprocket tracking. Because the pulley cage has been separated from the shifting function, the pulley cage no longer has to be located below sprockets, and can be moved to higher location to improve ground clearance. In addition, the mechanisms controlling each pulley can be better optimized for their separate functions.

[C40_guy]

Complicated is pretty, right?

[mjf]

Originally Posted by KonaSS

I am becoming more and more convinced that the Paceline is just a place for old roadies to yell at clouds.

It's always existed, but I definitely feel like it's becoming a lot more common lately.😑

[jamesdak]

Originally Posted by mjf

It's always existed, but I definitely feel like it's becoming a lot more common lately.😑

Dang young whippersnappers! Your time will come!!

[Spaghetti Legs]

Originally Posted by dddd

Suntour made three-pulley derailers about 40 years ago, for the same reason, to wrap lots of chain without coming too close to the road or trail.

There can be big differences between derailers made to work with one chainring and derailers made to work with multiple chainrings.
GRX rear derailer offerings have a much smaller maximum cog size limit when used with two chainrings, while this new design would seem to expand on what the GRX could handle.

EDIT: Found this on flickr:
https://live.staticflickr.com/8164/7...2e1c0057_c.jpg

Originally Posted by David Kirk

As I recall Suntour has a 3 pulley derailleur back in the day that was designed to allow more chain wrap and a larger gear range.

It worked....it looked silly but it worked.

dave

If it goes on one of my bikes it has to be Campy

[robt57]

Hey, we got used to the 4" lower RD pulley pretty fast. And lots are willing to 'way over pay' for this luxury as well.

[bicycletricycle]

Looks interesting to me. Modern parts are all pretty ugly anyways , maybe this will add some nice features?

[AgilisMerlin]

Originally Posted by mjf

It's always existed, but I definitely feel like it's becoming a lot more common lately.😑

i dream of corncobs and 40rpm climbs, and bleeding eyeballs, and wool shorts with tiny thin rawhide chamois

early 80's, i know have a tear in my eye'

[bicycletricycle]

Not the same but related to that kid that recently developed the system with the chain slack being taken up at the chainring with a single pulley in the back for chain alignment.

Originally Posted by Mark McM

Not quite - this derailleur separates the shifting function from the chain slack take-up function. Most modern derailleurs use a 2 pulley cage located below the cage, which serves two functions: It rotates forward and back to take up chain slack; and it moves laterally to shift the chain between sprockets while at the same time moving vertically to match the changes in sprocket size.

In the new patent, there is a pulley cage with two pulleys that rotates to take up the chain slack; but there is also a 3rd pulley that handles the shifting/sprocket tracking. Because the pulley cage has been separated from the shifting function, the pulley cage no longer has to be located below sprockets, and can be moved to higher location to improve ground clearance. In addition, the mechanisms controlling each pulley can be better optimized for their separate functions.

[oldpotatoe]

Originally Posted by bicycletricycle

Not the same but related to that kid that recently developed the system with the chain slack being taken up at the chainring with a single pulley in the back for chain alignment.

DOH..not complicated enough tho...

[commandcomm]

Maybe it will be in color silver and the derailler world will be in a better place.

[vespasianus]

Originally Posted by oldpotatoe

DOH..not complicated enough tho...

High pivot bike. Works fabulous on the downhill and takes hits like no other. But you need the strange contraption to control chain growth and such.

Overall, they work fine but just look silly.

[Matt92037]

If that RD ever makes it into production think we will see it on the MTB groups first.

The current MTB RD’s are massive which makes them prime targets to be taken out by rock, sticks or other things you find out on the trail. This new design looks like it could be a big step towards keeping the RD out of harms way.

[redir]

Increased ground clearance sounds like a wonderful idea to me. I only ride my MTB a few times a year, mostly just sign up for local races, and STILL in the few times I ride I manage to blow an RD up hitting something on the ground.