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This is pretty interesting! I've always used my springs to get my pads to grab the rim at the exact same time, I guess that is not possible with this setup? Also, is there a way to adjust the tension? Sorry if this has been answered or shown in pics somewhere else (I didn't look into it, sorry)!
The idea is to simplify set-up as much as possible, so there is zero adjustment. Bikes these days are pretty well made, so the days of wonky bosses and bent back ends should be behind us, and as long as the bosses are correctly positioned everything should be fit and forget.
We have had these for a while and we haven't yet seen a frame or wheel that is too far out of line for the brake to work right. On my bike they went on perfect and stay perfectly centred and do contact the rim both sides at once. Because of the geometry of where the spring is, it does tend to centre well and move evenly.
People who are obsessive about their brakes and need the pads to contact at EXACTLY the same time every time (like flatlanders, if there are any out there still running brakes anyway) will want to stick with the individual spring brakes and we will still be making those. But for people who just want a fuss free brake that works, these are ideal, they are also a good bet if you regularly put brakes on for a few rides then take them off, since there are no springs in the pivots they take seconds to install and remove.
Especially if paired with the QuikSlic... (to return to the subject..)
G.