Can one replace the core without removing the bike tire? fwiw, i have tube tires.

Yes, but if you are using tubes instead of tubeless, you need to make sure that your existing tube's core can be removed! If it is removable, you will see a flat spot on the end like the picture. You can use a tool or needle nose pliers to remove it. Eric

May sound silly but will these valve stems fit all prista cores ? In have a 48 mm valve stem

Yes. It should not be a problem fitting a 48 mm valve stem

will they work on a 42mm stem?

Yes! The core is agnostic of stem size or brand as long as it's a presta stem.

What is the screw size for the part that screws into the stem and for the dust cap screw?

According to wikipedia, both threads are 12-24. I looked at my valve cores and they do look bigger than #10. The threads for the dust cap are much deeper than the threads for the core. I do not have a way to measure them myself.

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🚴‍♂️ Upgrade your ride with precision and reliability!

RIDE CONFIDENTLY - Backed by satisfaction guarantee to keep your wheels rolling worry-free.
SEAMLESS COMPATIBILITY - Fits all standard presta valve stems for hassle-free upgrades or replacements.
ENGINEERED FOR ENDURANCE - Copper and nickel construction ensures long-lasting durability and corrosion resistance.
QUICK EASY INSTALLATION - Simply screw in with pliers or valve tool—no mechanic needed.
BULK VALUE PRO PERFORMANCE - Get 10 premium valve cores—never run low mid-ride.

The Velotubes Presta Valve Core 10-pack offers durable, copper-nickel valve cores designed for universal compatibility with presta valve stems. Lightweight and easy to install, this pack ensures you have reliable replacements on hand, backed by a satisfaction guarantee for peace of mind.

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Manufacturer	Qingdao Power Peak Tyre Co., Ltd.
Brand	VeloTubes
Item Weight	0.352 ounces
Product Dimensions	4 x 1 x 3 inches
Item model number	PVC10
Is Discontinued By Manufacturer	No
Manufacturer Part Number	PVC10

Velotubes Presta Valve Core - 10 Pack

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