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Presta vs schrader valves

301 Views 5 Replies 5 Participants Last post by  newleaf150
So i'm debating switching to schrader valves. My presta valves always seem to lose pressure and have been coming dis assembled as of late when I do add air to them.
Any thoughts.
By the way no hardcore riding just some rec. trail and hill climbing.
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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.
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I agree with Mr. New leaf—-loose valve cores. Possibly stuff on YouTube about removing and installing Presta valve cores
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Do you have a slow leak in the tube? Are you inflating with CO2? If so, CO2 will leak out of most inner tubes. That's why after a trail flat-fix, you go home, let the CO2 out, and pump with real air.
Good presta valves can be disassembled, or at least removed from the valve stem. So if you are overly 'vigorous' in unscrewing them, they could come out. But screwing them back down should take care of that.
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Can a bent presta valve core be replaced with a new one ?
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Can a bent presta valve core be replaced with a new one ?
Yes, it can. You can buy them at most local bike shops. Likely online as well.
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