hookooekoo
Senior Retro Guru
I had a look at my own bikes. I set my cantilevers up so that the posts on the pads are horizontal. To put it another way, the pads are at the same height as the bolt that clamps the brake pad post to the cantilever body.
It seems to me that if the brake pad post is angled upwards, as it is in your setup, the pad will swing upwards towards the tyre wall when the brake is released. In any case, the brake pad posts should be horizontal, or close to horizontal, so that the pads meet the rim squarely.
Some years ago when I had a frame resprayed I also had a bent cantilever boss replaced. The frame builder asked me what cantilevers I was using. I believe he asked because the cantilever boss position can vary slightly, depending on the exact design of cantilever. Obviously there is some adjustment available on most if not all cantilevers, but for some unusual cantilever designs the boss may have to be re-positioned.
If it helps, the dimension on my Shimano cantilevers from the centre of the cantilever mounting bolt, to the centre of the pad post clamp bolt, is about 30mm. That's with the adjustment near the top of the slot (upwards almost as far as it can go). The maximum adjustment available is about 10mm (mostly downwards in my case, because I have the pad post clamp near the top of the adjustment slot).
It seems to me that if the brake pad post is angled upwards, as it is in your setup, the pad will swing upwards towards the tyre wall when the brake is released. In any case, the brake pad posts should be horizontal, or close to horizontal, so that the pads meet the rim squarely.
Some years ago when I had a frame resprayed I also had a bent cantilever boss replaced. The frame builder asked me what cantilevers I was using. I believe he asked because the cantilever boss position can vary slightly, depending on the exact design of cantilever. Obviously there is some adjustment available on most if not all cantilevers, but for some unusual cantilever designs the boss may have to be re-positioned.
If it helps, the dimension on my Shimano cantilevers from the centre of the cantilever mounting bolt, to the centre of the pad post clamp bolt, is about 30mm. That's with the adjustment near the top of the slot (upwards almost as far as it can go). The maximum adjustment available is about 10mm (mostly downwards in my case, because I have the pad post clamp near the top of the adjustment slot).