Yeah... I have an adaptor. I buy tubes indiscriminately and wind up with whatever's on sale. Presta valves do tend to leak less, but I've found the difference to be marginal at best. And they're more fragile.

I think Schrader is probably the most miss-spelled name in bicycling, an American born in Germany named August Schröder invented it (Schroeder is also an accepted spelling, the German ö is actually pronounced as a long A would in English) at some point Mr. Schröder or his son George who also had a hand in the development anglicized the spelling to Schrader probably because he got tired of correcting the pronunciation all the time.

Personally I don't care what kind of valve is on the tube, as most bicycle pumps are convertible from one to the other, last time I used a garage to fill a bicycle tube was probably around 1974.... I have a good convertable foot pump, and each bicycle really should have it's own on-board pump setup for the valves on that bicycle....

!. Presta valves are not finicky.

2. The Shrader valve is an American invention, not German, though Shrader was a German immigrant to the US.

3. As noted above, adapters are cheap and readily available and can be stored on the end of the presta valve.

4. The thing I find better about the presta is that one need not compress a spring in order to get air into the tube and it is, in my opinion, easier to get a hand pump to work.

I see no advantage to the Shrader at all.

Yes, you're right, Mr. (Herr) Schrader was a naturalized citizen of the U.S.

I've never FUBAR'd a Schrader valve, but I have a Presta. It's overly delicate and complicated IMNSHO. It works, they have some advantages, but I've found the Shrader to be more robust.

The spring in the Shrader is tiny... you have trouble compressing it? Weird. Might just be a difference in what you're used to, I don't know. I grew up with Schrader's on everything and adapted to the occasional Presta when they began to spread like mold. I have more trouble getting those things lined up and functioning properly, though I know that's just because I've used them far less.

I have replaced more tubes from broken Presta valves then flats I have got in the last 20 years.

Schraders are MUCH more forgiving and less likely to be damaged. That is absolute horse crap that the Presta seals better. Once the valve closes the air holds it closed. The higher the pressure the harder it is pushed closed. The Schrader was inveted to over come how much of a pain in the butt a Presta is and the fact that when the valve does have a problem it can be replaced without throwing the tube out.

Tubes loose air from microscopic holes more so then leaking valves of either style. The higher the pressure the more it can force trough those little holes

There is so little of a volume of air in a bicycle tire that the loss of volume on a 700x25 of that that drops a 100psi tire to 50 psi wouldn't even register as a loss on the average tire gauge if you lost the same volume of air on a car tire.

The word you are looking for is misspelled. Man, that is irony.

Glad to hear you're liking those Weinmanns. The only thing I'll say is I'm not impressed with the coating/anodizing on the new silver Weinmann rims. They often come from the factory with a weird haze, looking rather cheap compared to Weinmanns from only a couple years ago. I've seen this on 519s, ZAC30s, DP18s, etc. YMMV.

I got to true a Sun CR-18 over the weekend; that seems like a quality rim.

I've recently built two sets of wheels with the CR-18 rims. 700c laced to Campagnolo NRs and 650A/26 1-3/8 for the Raleigh Sports. Polished -- I like them. Bought a pair of Sun M13 II rims which are a lot like the CR-18s only narrower. I think they're about 19mm outside width. They're destined for my old Falcon. Built the front and finished it today. Nice rim except at the joint the rim is about 1-2mm wider than everywhere else. No big deal, I suppose. Think it's probably only noticeable while building and truing. The wheel did build fine with good even tension in all the spokes, both true and round.

And then, I worked on my wife's Schwinn and because the air compressor isn't working I tried to gas up the Shrader valve tubes with a hand pump. Broke one of the Shrader valves and then replaced the tubes with presta valve tubes. Nirvana.

Shrader valves leak? Really? How?

If your brakes can reach 700c, and if you're replacing rims anyway, it's a good time to convert to 700c.

Wow, love how this degenerated into a Presta vs Schrader debate

(While we're also somewhat on the spelling debate, the one I use is from Wikipedia, FWIW: https://en.wikipedia.org/wiki/Schrader_valve)

I seem to prefer the ride of my 27" wheeled Varsity to that of my 700c wheeled Trek, but that's probably as much to do with tires and the frames themselves as anything else. Go for what's more convenient for YOU.

FWIW, I've used both Presta and Schrader valves and had no more or less trouble with the actual riding use of either. I will say, however, that the join of valve to tube is much stronger with the Schrader valves than with the Presta. If you're a bit of a clumsy gorilla (like myself), you can rather easily break the valve off of a Presta tube when you go to install a tire. Having this happen once was enough for me to decide that if my wheel can take Schraders, that's what I'll be buying.

You can't use schaders on a frame with trackends, that's why I use track dropouts. OP wants 27" rims, can't get 27" presta tubes....

Huh? News to me. More horse stuff as far as I can tell. Why would track ends matter at all? They do not come anywhere near the valve stem. Rim width being a problem... yes drop out style..NEVER.

My Ralligh has 27 presta drilled Mavic MA40's. 27x1 1/4tube is interchangeable with a 700x32 Most tubes in that size are marked with both sizes. 700x23 will fit a 27x1 1/8.

The only time you must use a presta is if the rims section width is too narrow. A rim 20mm wide is plenty wide enough for either and it comes down to personal preference. If you like Scrhader better then drill the rim out enough to fit them.

What I do like about Presta is the threaded stem keeping you from having to hold it from pushing into the rim. Most of my bikes wear presta to Schrader adapters so that I don't ruin another valve. I don't even take them off and tighten the Presta on two of my bikes.

Agreed, that is a nice feature, but at least Continental has taken care of that with their Schräder tubes, which have the threading and nut like typical (not all) Presta tubes.