braze on downtube shifter lever bosses on aluminum frame?
08-02-23, 07:38 PM
#1
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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
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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
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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
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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)
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AndrewRStewart
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08-03-23, 09:00 AM
#5
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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)
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08-03-23, 12:11 PM
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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
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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.
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08-10-23, 02:43 AM
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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.
