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Old 10-12-17, 12:13 PM   #1
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Rim Valve Stem Hole

Hey Folks,

Please don't scream at me..... If preformed correctly could a 'Presta' valve stem hole be drilled to accept the 'Schrader' type stem?

I'm building new wheels using DT Swiss TK540 36h 700c rims, new mid Shimano hubs, and triple butted spokes. Maybe I should man-up and enter the world of 'Presta', but I have a few good Schrader tubes stored up. Besides I just like the Schrader and never had a problem with them.

Thanks.....
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Old 10-12-17, 12:17 PM   #2
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If the rim is wide enough, no problem.
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Old 10-12-17, 12:46 PM   #3
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Occasionally the rim manufacturer drills them schrader, and the bike company includes the reducer and fits P/V tubes.

so the bike owner can use either tube, and in some cases like Schwalbe,
they use a ring nut on the P/V stems stepped to center the valve stem in the larger hole.

A Tapered Hand Reamer is my ideal tool for enlarging the hole , they're cheap, and cut in a not too fast rate of speed
making over doing it less likely.





.....
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Old 10-12-17, 01:01 PM   #4
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Quote:
Originally Posted by MePoocho View Post
Maybe I should man-up and enter the world of 'Presta',

For many years I avoided Presta valves because they were "skinny" and "weird". Now I strongly prefer them. I keep and USE the small knurled nut that stabilizes the valve against the rim. Seems most folks toss those in the trash. I can easily force the pump head onto the valve without driving the valve into the rim, without needing a second hand to support the valve. It's especially helpful when dealing with a fully deflated tube.
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Old 10-12-17, 01:27 PM   #5
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I have frequently drilled out the valve holes for Schraeder valves.

Having a Schraeder hole can actually be a good thing for touring in particular, because it allows you to use whatever tubes you find along the way. My touring bikes all have Schraeder holes with reducers for my presta valve tubes.
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Old 10-12-17, 02:08 PM   #6
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It's important that the rim valley be wide enough, otherwise one can experience flats from tube distortion and stress around the valve, as well as tire seating problems at the valve. If one uses the nut it's very important to keep tires properly inflated. The reason is that with poor inflation the tube can migrate, pulling on the valve base and causing a flat because the valve stem is forced to stay in place.

Last edited by cny-bikeman; 10-13-17 at 06:54 AM.
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Old 10-12-17, 02:20 PM   #7
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Does anyone have a source for schraeder hole to presta valve adopters? Are they common in bike shops?

This has me thinking - I should make another (very politically incorrect!) "damsel in distress" adopter; a presta pump to schraeder valve adopter to carry and use to help others roadside. (When we used that term in the '70s, it was highly unlikely we would ever meet a stranded woman riding presta valves. Only the hardcore rode presta and there weren't many of use.)

Ben
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Old 10-12-17, 02:30 PM   #8
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Yup common as hen's teeth... NB..

DIY, a short piece of hose, a schrader thumblock head , and the valve stem from a Presta tube would be convenient..



Silca machines a simple schrader to presta adapter, but since it opens the schrader valve
removing the presta pump would let all the air out..

much more common the schrader adapter, to screw onto a presta stem.



...



...

Last edited by fietsbob; 10-12-17 at 02:33 PM.
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Old 10-12-17, 02:30 PM   #9
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Good-Stuff one and all. Kinda reinforces what I thought.. Good input.

Any comments on the DT Swiss TK540 36h 700c rims? Sure, they are heavy, but supposed to be built like a brick poop house. I need durability more that light weight.

Gotta tell you that as a new poster this site is really great. Good knowledgeable people and quick responses.
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Old 10-12-17, 03:35 PM   #10
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Drilling the hole is easy and few if any rims are so narrow that you can't drill it.

But that's only half the story. On narrow rims, there may not be enough width for the thickness of the two tire beads and the wider valve. I've seen some tires with slightly thick beads which barely cleared a PV, on typical road rims. So before drilling, pince the tire together at the valve and see if there's some room to play with there.

Of course, nothing stops you from using a PV after you've drilled the larger hole, so it's not something that you'd regret doing if it dosn't work out.
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Old 10-12-17, 03:54 PM   #11
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FBinNY,

Yes, you are spot on about the narrow rims. My existing rims are such. I am amazed that a Schrader makes makes the drill. (Pun)

The rims I am getting are Swiss TK540 36h 700c and appear to have a flatter profile at the nipple exit area, so I should be OK. If not, I'll bite the bullet become 'Presta-nized'. Sooner that later that may become inevitable. Seems like the 'marketing-suits' nudge us in the directions that they think we should be going in all venues.

Always enjoy your input.
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Old 10-12-17, 03:59 PM   #12
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BTW - the smallest perfect drill size for a kiss fit SV hole is "N"
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Old 10-12-17, 04:03 PM   #13
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Excellent...! I have a 'lettered' index and a cross reference table.

Thanks.
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Old 10-12-17, 04:10 PM   #14
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I don't see any actual getting out and measuring the rims in question..

IDK Why this forum is so anti measuring?

Assume that every one has a DT Swiss TK540 . in the room next to them?
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Old 10-12-17, 04:40 PM   #15
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Quote:
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I don't see any actual getting out and measuring the rims in question..

IDK Why this forum is so anti measuring?

Assume that every one has a DT Swiss TK540 . in the room next to them?
Nobody is anti-measuring. I just explain the considerations, then it's up to those concerned to measure.

In any case the technology is limited, and we can't measure over the internet.
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Old 10-12-17, 05:47 PM   #16
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https://www.amazon.com/Schrader-Pres.../dp/B000XNZU1S
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Old 10-12-17, 06:52 PM   #17
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Wheels Manufacturing sells 2 lengths of Schraeder to Presta bushings. Your LBS can get them or order direct http://wheelsmfg.com/products/presta-stem-savers.html
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Old 10-12-17, 07:51 PM   #18
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Instead of a drill, a hand reamer can be used to enlarge the holes.
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Old 10-12-17, 08:04 PM   #19
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Quote:
Originally Posted by 79pmooney View Post
Does anyone have a source for schraeder hole to presta valve adopters? Are they common in bike shops?

This has me thinking - I should make another (very politically incorrect!) "damsel in distress" adopter; a presta pump to schraeder valve adopter to carry and use to help others roadside. (When we used that term in the '70s, it was highly unlikely we would ever meet a stranded woman riding presta valves. Only the hardcore rode presta and there weren't many of use.)

Ben
This is more compact than a length of hose......

https://www.amazon.com/Adapter-SCHRA...alve+converter
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Old 10-12-17, 09:09 PM   #20
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Quote:
Originally Posted by 79pmooney View Post
Does anyone have a source for schraeder hole to presta valve adopters?
They should be readily available in bike shops and elsewhere.



https://www.walmart.com/ip/Schrader-...&wl13=&veh=sem
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Old 10-13-17, 12:08 AM   #21
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Originally Posted by 79pmooney View Post
Does anyone have a source for schraeder hole to presta valve adopters? Are they common in bike shops?
They’re common.

Remember that to get any tube/valve benefit from them, they have to be mounted in the layer of the rim closest to the tube.
Mounting one in the layer facing the hub is only good for avoiding grit and water getting into the rim by the gap around the valve stem.
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Old 10-13-17, 06:38 AM   #22
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Originally Posted by 79pmooney View Post
Does anyone have a source for schraeder hole to presta valve adopters? Are they common in bike shops?
How many do you need? I think that I've still got a few down in my shop. Mine are rubber grommets and a bit of a trick to install the first time. PM me an address and I'll mail a couple to you.
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Old 10-13-17, 08:09 AM   #23
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Why not use presta tubes, and put a Schader adapter on the end of the presta valve?
1) You don't have to drill into a rim that is probably pretty weight-optimized to begin with
2) You get to keep the presta knurled nut which, as squidpuppet points out, is useful in being able to fill your tire
3) As an added advantage, if you go fast enough, your presta locknut will keep the valve stem from opening up due to centrifugal force (this actually happened with some high velocity wheels - the Schrader valve opened up a little and leaked).

If you want to proceed with drilling make sure that you have enough "meat" in the rim. If the proper drill will end up taking some metal off the rim sides, I'd not do it. If that's ok and you drill, I'd be very careful to deburr the hole on both sides.

Here's the adapter I'm talking about, though:


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