Help please... canti boss issue driving me insane

2manyoranges said:

Note these have very short threads

https://www.ebay.co.uk/itm/296502467707?_skw=10mm+cantilever+bosses&itmmeta=01K1H8K3NP6RBAZ8V5JMARGP0S&hash=item4508ec9c7b:gTQAAOSwv99mbAp0&itmprp=enc:AQAKAAAA0FkggFvd1GGDu0w3yXCmi1fs3mdPFJz+imxcjgV7646MvEiShCgZQ744BoiETkiHX5FaVJVFRoJ8U9a6wL9Wj2xuiQvpyficbgO72KXo6a+B3vG1ZwysqkdOJaOrLWi0bEjN/9duJiT0lqxPhhrGy1kZyXLPCkyHGH0gI7Rfmddl1C/95JXXJljpu1EWpH6OtkJRBbcVZBIvCZET0HI7ijO4Ifub0q8uNmRc+pSVps35j4+AwQm+skcXecH/jLOKV17T6gWSgStqTYdiRbhdXMQ=|tkp:Bk9SR467zKiMZg

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Thanks, I did see those but discounted them as I need a frame and fork set.

ishaw said:

I've got a load of frame bosses kicking around either new or from where I've replaced steel with ti. I can have a look to see if any don't have the shoulder.

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@ishaw would you mind please? That would be fantastic if you can. I can swap my ti ones with the shoulder if they are any use to you.

I slept on it and realised grinding the shoulder off the posts won't work, as I'd then be left with a stud that was 2mm too long. And grinding the shoulder, cutting down the posts by 2mm and then trying to neaten the thread is more effort than I can face.

finbar said:

Thanks, I did see those but discounted them as I need a frame and fork set.

@ishaw would you mind please? That would be fantastic if you can. I can swap my ti ones with the shoulder if they are any use to you.

I slept on it and realised grinding the shoulder off the posts won't work, as I'd then be left with a stud that was 2mm too long. And grinding the shoulder, cutting down the posts by 2mm and then trying to neaten the thread is more effort than I can face.

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ah ... effort

picture this

I carefully place a unique part from my partner's hub gear system on the workbench.
Next evening I come back home to finish the repairs.
No part.
It's a small threaded clamp
I spend two hours scouring the workshop floor with headtorch and maglite.
I give up
I spend another hour making a new part

Two months later I am weeding the gateposts. They are old railway sleepers set in concrete so have the screw holes in them for rail baseplates.
Something catches my eye. The part is sitting in one of the holes. I ask my four year old 'do you recognise this?' when I held it out. 'Oh yes...I put it in the hole...'. Ah Ok.

2manyoranges said:

ah ... effort

picture this

I carefully place a unique part from my partner's hub gear system on the workbench.
Next evening I come back home to finish the repairs.
No part.
It's a small threaded clamp
I spend two hours scouring the workshop floor with headtorch and maglite.
I give up
I spend another hour making a new part

Two months later I am weeding the gateposts. They are old railway sleepers set in concrete so have the screw holes in them for rail baseplates.
Something catches my eye. The part is sitting in one of the holes. I ask my four year old 'do you recognise this?' when I held it out. 'Oh yes...I put it in the hole...'. Ah Ok.

Click to expand...

I often get this kind of help from the family. I am clearly a lot meaner spirited than you as I quickly get to the “Has anyone touched Dads stuff?” Question.

2manyoranges said:

ah ... effort

picture this

I carefully place a unique part from my partner's hub gear system on the workbench.
Next evening I come back home to finish the repairs.
No part.
It's a small threaded clamp
I spend two hours scouring the workshop floor with headtorch and maglite.
I give up
I spend another hour making a new part

Two months later I am weeding the gateposts. They are old railway sleepers set in concrete so have the screw holes in them for rail baseplates.
Something catches my eye. The part is sitting in one of the holes. I ask my four year old 'do you recognise this?' when I held it out. 'Oh yes...I put it in the hole...'. Ah Ok.

Click to expand...

And this is why I'm thankful I don't have children.
I'm already bad enough at losing a part when I've been sitting in the same place, haven't moved and having to scour around at arms length for whatever part I lost. Then a bit of time goes by and I have a princess and the pea moment while barefoot and feel the bolt, retainer, bearing or brake pad that's somehow managed to get under my rug.

Sorry I'm no help to the OP. All my removable canti post's have the lip. And to the best of my knowledge all my current canti bikes have non removable posts.

I will say I wasn't impressed with the Shimano CX50 canti's. Dunno if it was the road sized pad or Shimano always changing the pull of their road levers but I couldn't get them to brake well. I even measured the post spacing and and used shimano's table for the right pad spacer.

I have had a rummage and all of my frame ones have the shoulder. One set has a much smaller shoulder than the others - pic below.

Thank you @ishaw for digging those out an going to the trouble of taking a photo, and @Nothin-fancy for sharing your thoughts on the CX50s (d'oh!). Thanks also @2manyoranges for lightening the tone .

I'm sure you'll all be somewhat amused to hear I've just cracked and bought some Avid Shorty Ultimates! They will work fine with the shoudered posts as the spring arrangement is totally different and doesn't use the frame pin hole at all, and given I've spent £20 on ti posts already, I'd rather get something that works with those. Plus the Avids will look great with the rest of the bike, which is red and black.

I now use the Shorty Ultimate's. Damn fine brake when paired with Swissstop BXP pads. Easy to set up, too. The instructions are a bit silly as they instruct you to set the straddle height in relation to the top of the tyre which means the brake will perform differently between one tyre and another.

I think I'm wedded to mismatched straddle cable heights anyway, because my frame has a built-in rear hanger that is notoriously too low (Scott Addict CX)....

Here are the new brakes looking well and working nicely. Despite the wildly different straddle cable lengths, they feel good .

Cross season is almost here!!! Stoked you figured out the boss stays. It looks like it's working for you! Though that doesn't look very retro...