It is possible but typically considered inadvisable to go from presta to schrader valves. This involves either drilling out the holes in your bike's rims to accept the larger diameter of the schrader valve, or rebuilding the wheels using hoops featuring the larger diamerter holes.
The former sounds simple enough, but carries the potential to cause catastrophic wheel failure if done improperly, or on the wrong rim. A bike shop could likely advise you there. I cannot except to say this is probably not the best idea.
The latter solution is easy enough, but also costly. I wonder if it might help to explore the trouble you're having with your existing setup a little more.
Do you run tubes or a tubeless setup? If tubes, do you use any sort of sealant in the tubes?
When you say that your valves have been coming disassembled, I imagine that perhaps you are getting a poorly assembled valve, but one meant to be removed to facilitate the use of sealant.
Might this be the case? If it is, I'd expect to be able to thread the loose, smaller bit into the middle of the valve's body and tighten it gently but soundly. This can be done carefully using fingers or a small pair of pliers. There are also specific tools available, such as the Park VC-1. It is the one I use, but there are several other versions which serve the same purpose.
It's possible I'm way off base, too. Do you have any pics available? Fine detail can be hard to get but will help us understand the problem you face. Leaking valves are definitely something that should not be happening on a regular basis.
The former sounds simple enough, but carries the potential to cause catastrophic wheel failure if done improperly, or on the wrong rim. A bike shop could likely advise you there. I cannot except to say this is probably not the best idea.
The latter solution is easy enough, but also costly. I wonder if it might help to explore the trouble you're having with your existing setup a little more.
Do you run tubes or a tubeless setup? If tubes, do you use any sort of sealant in the tubes?
When you say that your valves have been coming disassembled, I imagine that perhaps you are getting a poorly assembled valve, but one meant to be removed to facilitate the use of sealant.
Might this be the case? If it is, I'd expect to be able to thread the loose, smaller bit into the middle of the valve's body and tighten it gently but soundly. This can be done carefully using fingers or a small pair of pliers. There are also specific tools available, such as the Park VC-1. It is the one I use, but there are several other versions which serve the same purpose.
It's possible I'm way off base, too. Do you have any pics available? Fine detail can be hard to get but will help us understand the problem you face. Leaking valves are definitely something that should not be happening on a regular basis.