braze on downtube shifter lever bosses on aluminum frame?
08-02-23, 07:38 PM
#1
Time Traveler
Thread Starter
Join Date: Jan 2022
Location: Florida, USA
Posts: 326
Bikes: 1983 Ross Paragon
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 204 Post(s)
Liked 98 Times
in
51 Posts
braze on downtube shifter lever bosses on aluminum frame?
I would like to modify an aluminum frame to have downtube shifter bosses for some Shimano frictionless shifter levers. How can I accomplish this? Also, the down tube is not round. Any help is appreciated. Thanks.
08-02-23, 07:41 PM
#2
Senior Member
Join Date: Jul 2007
Location: South shore, L.I., NY
Posts: 6,885
Bikes: Flyxii FR322, Cannondale Topstone, Miyata City Liner, Specialized Chisel, Specialized Epic Evo
Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 3242 Post(s)
Liked 2,087 Times
in
1,182 Posts
Something like this
https://problemsolversbike.com/produ...-shifter-mount
Just get a tube diameter and see what fits. I did a Google of “Bolt on downtube shifter mounts”
https://problemsolversbike.com/produ...-shifter-mount
Just get a tube diameter and see what fits. I did a Google of “Bolt on downtube shifter mounts”
08-02-23, 08:00 PM
#3
Time Traveler
Thread Starter
Join Date: Jan 2022
Location: Florida, USA
Posts: 326
Bikes: 1983 Ross Paragon
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 204 Post(s)
Liked 98 Times
in
51 Posts
Something like this
https://problemsolversbike.com/produ...-shifter-mount
Just get a tube diameter and see what fits. I did a Google of “Bolt on downtube shifter mounts”
https://problemsolversbike.com/produ...-shifter-mount
Just get a tube diameter and see what fits. I did a Google of “Bolt on downtube shifter mounts”
08-03-23, 07:44 AM
#4
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,095
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4210 Post(s)
Liked 3,875 Times
in
2,315 Posts
I have read of using a heavy duty "hose clamp" that has had the shift bosses brazed to it as an adaptor. This could conform to a non round tube easily.
Another possibility is to use a through the tube shaft that has shift boss shapes that attach (thread on) to it's ends. Much like what Cannondale used for years.
However I do hope the shifters that wtll be used do have some friction to them, otherwise the lever will just return to the position the der's spring pulls it to. An indexed shifter has a huge amount of friction, just located at specific spots about the lever's spool. Andy (who as a kid wondered why anyone would want a date with two pits in it. One pit is enough, "pitted dates" to me meant more were added, not the one removed)
Another possibility is to use a through the tube shaft that has shift boss shapes that attach (thread on) to it's ends. Much like what Cannondale used for years.
However I do hope the shifters that wtll be used do have some friction to them, otherwise the lever will just return to the position the der's spring pulls it to. An indexed shifter has a huge amount of friction, just located at specific spots about the lever's spool. Andy (who as a kid wondered why anyone would want a date with two pits in it. One pit is enough, "pitted dates" to me meant more were added, not the one removed)
__________________
AndrewRStewart
AndrewRStewart
08-03-23, 09:00 AM
#5
Time Traveler
Thread Starter
Join Date: Jan 2022
Location: Florida, USA
Posts: 326
Bikes: 1983 Ross Paragon
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 204 Post(s)
Liked 98 Times
in
51 Posts
I have read of using a heavy duty "hose clamp" that has had the shift bosses brazed to it as an adaptor. This could conform to a non round tube easily.
Another possibility is to use a through the tube shaft that has shift boss shapes that attach (thread on) to it's ends. Much like what Cannondale used for years.
However I do hope the shifters that wtll be used do have some friction to them, otherwise the lever will just return to the position the der's spring pulls it to. An indexed shifter has a huge amount of friction, just located at specific spots about the lever's spool. Andy (who as a kid wondered why anyone would want a date with two pits in it. One pit is enough, "pitted dates" to me meant more were added, not the one removed)
Another possibility is to use a through the tube shaft that has shift boss shapes that attach (thread on) to it's ends. Much like what Cannondale used for years.
However I do hope the shifters that wtll be used do have some friction to them, otherwise the lever will just return to the position the der's spring pulls it to. An indexed shifter has a huge amount of friction, just located at specific spots about the lever's spool. Andy (who as a kid wondered why anyone would want a date with two pits in it. One pit is enough, "pitted dates" to me meant more were added, not the one removed)
Likes For BikePower:
08-03-23, 12:11 PM
#6
Senior Member
Join Date: Jan 2005
Location: Baltimore, MD
Posts: 5,378
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 2485 Post(s)
Liked 2,956 Times
in
1,679 Posts
The New Yorker humor writer Calvin Trillin once wrote a very funny article on regional differences in chili recipes. He noted that one restaurant in Cincinnati, which offered chili in a bewildering array of variations, including "five-way" and "six-way" varieties, had a prominently displayed sign reading "CHILI WITHOUT BEANS - 50 CENTS EXTRA." Trillin said he wondered how much the professional bean extractors would have been paid so that the restaurant broke even on each bowl.
08-03-23, 02:42 PM
#7
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,399
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,699 Times
in
2,519 Posts
That chili is always disappointing, but it's apparently the best you can do in Cincinnati. So I always go there when I'm nearby.
With beans though, they can put the ones they took out of the "without" in my dish.
With beans though, they can put the ones they took out of the "without" in my dish.
Likes For unterhausen:
08-10-23, 02:43 AM
#8
Senior Member
Join Date: Dec 2019
Posts: 957
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 321 Post(s)
Liked 263 Times
in
212 Posts
You could braze them on with TIG aluminium bronze. You could also TIG weld them but there's a good chance that using aluminium bronze would affect any heat treatment less. There are also kind of aluminium solder type things that you see people doing at very low temps with a blowtorch (just butane or something). Not very strong but might be good enough for shifter bosses.
