T
Tim McNamara
Guest
A Muzi wrote:
> jim beam wrote:
>> jim beam wrote:
>>> for the skeptics.
>>>
>>> http://www.flickr.com/photos/38636024@N00/1928128941/
>>> http://www.flickr.com/photos/38636024@N00/1928128939/
>>> http://www.flickr.com/photos/38636024@N00/1928128923/
>>
>> based on viewer stats, it seems some people are only looking at the
>> first link. you'll need to look at all three to see the
>> progression.
>
> I saw a photo series of a rear caliper whose shoes ended up angled
> the wrong way at full compression. I'm sorry I can't help with that.
>
> Brakes on bicycles here seem to not have any complex mechanism to do
> such a complex movement - all DPs here have a pair of simple sleeve
> pivots for the arms. Modern shoes have orbital mounts for toeing.
>
> In fact if our rear calipers on bikes moved like your rear brake
> photos, we would know it. The pads would be noisy, hitting the rim
> backwards.
>
> Again, perplexing photos which I don't understand and cannot explain.
> If you find no solution, check with Shimano or get some genuine
> Campagnolo calipers.
I can think of a couple of possibilities to explain the apparent motion.
One is motion parallax error caused by the camera position. Another
is that the brakes are laying freely on a surface and may move slightly
as the brakes close. Note that there are two sets of photos that appear
to show contradictory evidence. Hence my suggestion that the brakes
should be mounted to a planar surface to provide a reference. If I
owned a dual pivot brake, I'd do it, but unfortunately all my bikes have
cantilevers, single pivots or hub brakes.
> jim beam wrote:
>> jim beam wrote:
>>> for the skeptics.
>>>
>>> http://www.flickr.com/photos/38636024@N00/1928128941/
>>> http://www.flickr.com/photos/38636024@N00/1928128939/
>>> http://www.flickr.com/photos/38636024@N00/1928128923/
>>
>> based on viewer stats, it seems some people are only looking at the
>> first link. you'll need to look at all three to see the
>> progression.
>
> I saw a photo series of a rear caliper whose shoes ended up angled
> the wrong way at full compression. I'm sorry I can't help with that.
>
> Brakes on bicycles here seem to not have any complex mechanism to do
> such a complex movement - all DPs here have a pair of simple sleeve
> pivots for the arms. Modern shoes have orbital mounts for toeing.
>
> In fact if our rear calipers on bikes moved like your rear brake
> photos, we would know it. The pads would be noisy, hitting the rim
> backwards.
>
> Again, perplexing photos which I don't understand and cannot explain.
> If you find no solution, check with Shimano or get some genuine
> Campagnolo calipers.
I can think of a couple of possibilities to explain the apparent motion.
One is motion parallax error caused by the camera position. Another
is that the brakes are laying freely on a surface and may move slightly
as the brakes close. Note that there are two sets of photos that appear
to show contradictory evidence. Hence my suggestion that the brakes
should be mounted to a planar surface to provide a reference. If I
owned a dual pivot brake, I'd do it, but unfortunately all my bikes have
cantilevers, single pivots or hub brakes.