There is considerable disagreement as to which brake should be connected to which lever:
- Some cyclists say it is best to have the stronger right hand (presuming a right-handed cyclist) operate the rear brake.
- Motorcycles always have the right hand control the front brake, so cyclists who are also motorcyclists often prefer this setup.
There are also observable national trends:
- In countries where vehicles drive on the right, it is common to set the brakes up so that the front brake is operated by the left lever.
- In countries where vehicles drive on the left, it is common to set the brakes up so that the front brake is operated by the right lever.
The theory that seems most probable to me is that these national standards arose from a concern that the cyclist be able to make hand signals, and still be able to reach the primary brake. This logical idea is, unfortunately, accompanied by the incorrect premise that the rear brake is the primary brake.