Pinned joint rims will have the added weight of the seam bridging pins..
now that you can write and post here you can find a couple innertubes with the proper stem length
Schwinn ( then Pacific cycles Brand) had an anomaly of aerodynamic looking rims needing long Schrader stems...
long Presta stems are more common, my Local usually has 700c PV tubes in a variety of lengths.. in normal times ..
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