In reality there will be little benifit of doing this, except maybe the heat generated during braking will be shared between rim and disk. There will be no noticable increase in braking because each of the two cables will only be able to have a share of the tension of a single cable, and thus will only provide that share of braking. And that is if you can set both brakes up properly, which would be difficult.
Originally Posted by
silverwolf
It did actually work, but I nearly went over the bars on a downhill. When checking the front wheel afterwards, the spokes looked like they were stretched (ie showed signs of stress). I wouldn't reccomend it.
This, silverwolf, is an obvious load of horse*****. I know this because:
1. For the reasons mentioned above, the braking wouldn't actually be any stronger (although the poor setup of one or the other might make going over the bars more likely). Did you use two levers pulled with two hands?
2. Your spokes will pull through the rim long before they would 'stretch.' Claiming your spokes stretched is ridiculous... either you are lying, or your spokes were improperly tensioned and you didn't notice until after this incident.
3. Rim brakes do not place any load on the spokes. In fact, using rim brakes in conjunction with disk brakes will create
less stress on the spokes than disk brakes alone because some of the braking will be handed by the rim.