How Big is a r11 Cardan brake?

Barry Robin · Post by **Barry Robin** » Wed May 01, 2019 5:48 pm

Could someone measure the outside diameter of the R11 Cardan brake drum? My mechanic added an extra outside sleeve and he made it too big...it only contacts the brake pads on the very outside of the pads-no contact in the middle. I'll need to turn it down so it works.

brown3459 · Post by **brown3459** » Thu May 09, 2019 8:00 pm

on my R16 I get about 118 mm but it is hard to measure in situ on the bike.I will take it apart if you can not get a more definitive answer

Barry Robin · Post by **Barry Robin** » Thu May 09, 2019 11:55 pm

From one Barry to another, thanks for taking the measurement for me.
So far I've gotten answers ranging from 119-121mm. and yours looks like it might be 118mm. I'll probably just pick a mid-measurement and match the drum to the new brake pads-they only last about six months anyway...

brown3459 · Post by **brown3459** » Sat May 11, 2019 4:35 pm

Great to hear you are riding that bike ! I imagine those San Francisco hills must take a toll on brakes!

Barry Robin · Post by **Barry Robin** » Sun May 12, 2019 2:09 am

I just think about the Flintstone's car-it's about the same thing.