I've wanted better rim brakes on my "city bike", the bicycle I mostly ride around Melbourne.
The 35 and 38mm wide tyres I'm using are handy for cobbled laneways, tram tracks, pot holes and drainage grills.
The brakes I have fit fine and work, but they don't feel very powerful.
Here is a great post about brakes for big tyres, with handy pictures:
Another handy post, no pictures but it describes various size options.
For my reference my blue bike has 62mm size between brake pivot bolt and the mid rim. This puts me just beyond the Shimano products, but still in the TekTro product range :)
