Shimano Positron DG-100
12-08-10, 03:28 PM
#1
Senior Member
Thread Starter
Join Date: Aug 2010
Posts: 241
Bikes: Peugeot, Bianchi, Raleigh, Free Spirit, Nishiki, Gitane, and others...
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Shimano Positron DG-100
Just picked up a really nice little Free Spirit boulevard cruiser and it has this really nifty Shimano Positron sprocket selection hardware. Works like a treat, very light & positive action.
Who knew ??
Mike
Who knew ??
Mike
12-08-10, 03:34 PM
#2
Bianchi Goddess
Join Date: Apr 2009
Location: Shady Pines Retirement Fort Wayne, In
Posts: 27,858
Bikes: Too many to list here check my signature.
Mentioned: 192 Post(s)
Tagged: 2 Thread(s)
Quoted: 2930 Post(s)
Liked 2,923 Times
in
1,491 Posts
I think Positron was (aside from beinf the earliest index system) like Campi's Synchro. if it was set up right it worked well, if the set up was off it stunk. like alot od shimano stuff it likely suffered from lack of spares too
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk
12-08-10, 09:28 PM
#3
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,706
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5781 Post(s)
Liked 2,576 Times
in
1,427 Posts
This was definitely the grand daddy of index. It lasted a few years then Shimano withdrew it mainly because the dealers and "serious" riding crowd wouldn't have it. Shimano pulled back, and a few years passed before they pulled the various pieces together and introduced modern index systems.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
12-08-10, 09:45 PM
#4
Insane Bicycle Mechanic
Join Date: Mar 2008
Location: other Vancouver
Posts: 9,837
Mentioned: 34 Post(s)
Tagged: 0 Thread(s)
Quoted: 805 Post(s)
Liked 704 Times
in
376 Posts
This was definitely the grand daddy of index. It lasted a few years then Shimano withdrew it mainly because the dealers and "serious" riding crowd wouldn't have it. Shimano pulled back, and a few years passed before they pulled the various pieces together and introduced modern index systems.
So I guess that makes the French randonneuring bikes the great-great-granddaddy of indexing.
__________________
Jeff Wills
Comcast nuked my web page. It will return soon..
Jeff Wills
Comcast nuked my web page. It will return soon..
12-08-10, 10:17 PM
#5
Senior Member
Join Date: Mar 2008
Location: PNW (PDX)
Posts: 186
Bikes: 1999 Lightspeed Classic, Specialized Stumpjumper
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I'm curious about that diagram in the upper right. Are they saying that if you chose to assemble your cogs out of order, the derailleur would still track? Was that ever done (assembling cogs out of order)? Why would it have been done?
12-09-10, 07:33 PM
#6
Insane Bicycle Mechanic
Join Date: Mar 2008
Location: other Vancouver
Posts: 9,837
Mentioned: 34 Post(s)
Tagged: 0 Thread(s)
Quoted: 805 Post(s)
Liked 704 Times
in
376 Posts
__________________
Jeff Wills
Comcast nuked my web page. It will return soon..
Jeff Wills
Comcast nuked my web page. It will return soon..
12-09-10, 09:15 PM
#7
Constant tinkerer
I had Positron shifting on an old Panasonic 10 speed. It actually worked great, even though the shifters were on the stem. Shifting was equally crisp in each direction due to the lack of a return spring. That bike also had Shimano's Front Freewheeling system which was little more than a novelty.
(Because I enjoy posting pics of my bikes)
(Because I enjoy posting pics of my bikes)
Last edited by FastJake; 12-09-10 at 09:30 PM.
Thread
Thread Starter
Forum
Replies
Last Post
jrwblw375
General Cycling Discussion
0
08-23-15 11:17 AM
Bravin Neff
Bicycle Mechanics
3
12-28-14 07:56 PM
