Cantilever Post thread size?
02-09-20, 07:39 AM
#1
Senior Member
Thread Starter
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,595
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 455 Post(s)
Likes: 0
Liked 112 Times
in
85 Posts
Cantilever Post thread size?
I want to chase the threads on the bosses. Would anyone know the size?
Thanks!
Thanks!
02-09-20, 08:12 AM
#2
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,394
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,695 Times
in
2,517 Posts
it's a 6mmx1 Which is the standard 6mm coarse thread.
02-09-20, 08:31 AM
#3
Senior Member
Thread Starter
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,595
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 455 Post(s)
Likes: 0
Liked 112 Times
in
85 Posts
Thanks! BTW does it need to be a flat bottom tap or will a regular one work?
02-09-20, 08:33 AM
#4
Senior Member
Thread Starter
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,595
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 455 Post(s)
Likes: 0
Liked 112 Times
in
85 Posts
Woops I think I may have described the situation incorrectly. The threads I am referring to are the one on the boss that is brazed to the stay. Not the one that the brake is bolted to.
02-09-20, 12:13 PM
#5
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,071
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: 4200 Post(s)
Liked 3,853 Times
in
2,303 Posts
Bosses with a removeable post (often found on Al or Carbon frames, less so on steel ones) have been made with a few different threadings. Generally larger in diameter and with a coarser pitch then the M6 threads that run inside the pivot portion of a canti mount. As to the need for a bottoming tap- I would think it is obvious as to is the hole a through one or with a bottom (as in blind).
Didn't the bases come with their posts? If so then can't you measure the post? Andy
Didn't the bases come with their posts? If so then can't you measure the post? Andy
__________________
AndrewRStewart
AndrewRStewart
02-09-20, 01:06 PM
#6
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,394
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,695 Times
in
2,517 Posts
I I can't imagine a taper (starting) tap will work too well, you'll need a bottoming tap. Or maybe a plug tap will work. In any event, you probably are not going to get it locally unless you have an industrial supply.
It says M10 x 1.5 on paragon's site. There have been other sizes, but I can't imagine you having access to unbrazed bosses for those other sizes. M10 x 1.5 is the standard 10mm coarse thread.
It says M10 x 1.5 on paragon's site. There have been other sizes, but I can't imagine you having access to unbrazed bosses for those other sizes. M10 x 1.5 is the standard 10mm coarse thread.
Last edited by unterhausen; 02-09-20 at 01:13 PM.
02-09-20, 01:55 PM
#7
Senior Member
Thread Starter
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,595
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 455 Post(s)
Likes: 0
Liked 112 Times
in
85 Posts
Andy, they did come with posts but after we brazed them on the fork blades and seatstays they seem a bit "sticky". So I thought I'd chase the threads and clean them up.
02-09-20, 02:00 PM
#8
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,394
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,695 Times
in
2,517 Posts
if they thread in, being sticky is good. I thought they came with loctite on them. I would just put some grease on the threads
02-09-20, 02:14 PM
#9
Senior Member
Thread Starter
Join Date: Dec 2011
Location: NE Ohio
Posts: 2,595
Bikes: 1992 Serotta Colorado II,Co-Motion Speedster, Giant Escape Hybrid, 1977 Schwinn Super Le Tour
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 455 Post(s)
Likes: 0
Liked 112 Times
in
85 Posts
Unterhausen, thanks!! I didn't think to look at Paragon's site and that's where I got them! I checked McMaster Carr and they have the tap for $10. Works out as I need a few other things from them and their fulfillment center is only 30 minutes away.
