I'm new to this forum and would like to ask if it is safe to use a V brake rim with a disc? I'm using Shimano Deore M555 hubs with discs laced to Mavic EX 721 32 hole rims and DB spokes. Apologies if this has been queried before. Thanks in anticipation. Paul C (Chaz)
Not only is it safe it is fairly common. When disc brake became more affordable many after market manufacturers sold dual brake wheels. Disc hubs and "V" brake rims. Just don't use "V" brakes on a disc only specific rim. The dual use wheel may have been a way to limit new inventory to one type of wheelset.
In general, yes. That said disc brakes have higher radial torsion, so the most important factor is spoke lacing and tension.
It is a common practice as "V" brake rims are more common and usually cheaper for a similar quality as disc specific rims.
The other way around is not an option though, obviously!!