before indexing....

[colin54]

More pictures of this bike here :-


https://farm8.static.flickr.com/7011/68 ... febd_b.jpg

https://www.flickr.com/photos/53954458@ ... 032935783/

What's going on with the roller and teeth on the inner ring and a cam lobe on the BB spindle ,described as
a ' powercam '.

There's an album of pictures in the 2nd flikr link.

Edit: some info about Houdaille EX Power Cam here..similar, same ??

It still doesn't quite explain the indexing mechanism in the original picture.


http://www.classicrendezvous.com/USA/PowrCam_main.htm

[Norman H]

A search for Powercam Crankset brings up many hits.

It seems to be a device for advancing and retarding the chainrings relative to the cranks.

http://www.velobase.com/ViewComponent.aspx?ID=ea56395b-a2bf-4ea7-bf4e-3bb0449eff8b&Enum=115

[Brucey]

another image of a powercam crankset



seems mechanically unrelated to the gear levers, except for the fact that there are two slightly weird ideas on one bike....

cheers

[[XAP]Bob]

Somebody's going to say you shouldn't need to look to see what gear you're in. Well, whether you should or not, I do. It could even be that we do it unconsciously and only notice we do (and we can't...) when we ride in the dark.

I can't - the window that tells me what gear I am in faces away from me. I only ever know what rear gear I'm in when I'm in 9 and need a higher gear, or in 1 and need a lower gear.

I can see the chainset out in front of me, but the rear is behind my seat, and enclosed by bags/rack, so it takes a concerted effort to turn and check if there is anything clogging the derailleur, let alone trying to see which sprocket is carrying the chain.

[JohnW]

Nice... shouldn't use Shimano cables on Campagnolo levers though...

Quite right - waste of good cable!

[The utility cyclist]

And why the lack of a front brake?
On a 2nd look could the V notches be for the rear mech indexing and the bolts a means of indexing the front mech with a bit of trimming.

the bike has the latest wi-fi disc brakes. get with it daddio

that's old skool grandpa, mag braking with thought control activation is were it's at