I've had another look at the brake plate and discovered my initial analysis was incorrect (a senior moment.....) I have therefore amended the text below.
I recently purchased a modified front brake plate for an Ariel alloy full-width hub.
Supposedly, it is twin leading shoe, but.....
Whoever did the work removed the fulcrum adjuster and replaced it with a second brake cam spindle. On the outside of the plate, the two arms are connected by an adjustable rod. So far, so good.....
On the inside, both shoes float. Each shoe has one original flat end and the other end has a machined wedge-shaped abutment fitted to it.
Does this particular modification look familiar to anyone? Has anyone got one like this?
Every TLS brake I have had in the past had one end moved by the brake cam whilst the other end rested against a fixed post (either floating, or the shoe had a semi-circular recess which rested on a pivot post.) On this one, the cams have been made 'single- sided' so that the 'trailing'end of the shoe rests against a cylindrical part of the cam spindle, opposite to the cam 'lobe.'
I have not tried the brake on my bike yet. I am too concerned about the engineering fundamentals to take that risk! I understand that there have been TLS conversions made for the fw hub, but I have never seen one 'in the flesh,' or any photographs of the internals.
Can anyone shed any light on this apparent oddity that I have acquired, please? I apologise for the lack of photos; I assume that it is possible to post them on here but I have yet to discover how!
Last edited by allan.walker
on Wed Nov 13, 2019 10:39 am, edited 1 time in total.