Those are a mis-application of top mount cross levers.
Just because you find a picture of someone that did not get the safety bulletin,
a product of common sense mechanics,
and is continuing a folly, doesn't make it a good idea.
BMX lever would be OK ..
[ Realize, they are made to go on a 7/8" bar tube,
road bars are 15/16", away from the middle bulge, so may not fit.
reverse levers mount by expanding inside the open end of the tube.]
U brakes are a type of centerpull and show up often, on BMX bikes ..
Last edited by fietsbob; 09-30-11 at 10:17 AM.