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 valve cores that keep you rolling—durability meets precision!

BUILT TO LAST - Premium copper-nickel brass ensures long-lasting performance and corrosion resistance.
FITS EVERY RIDE - Universally compatible with all Presta valve stems for seamless upgrades or replacements.
BULK PACK ADVANTAGE - 10-pack supply means you’re always ready—never miss a ride due to valve issues.
SATISFACTION ASSURED - Backed by VeloTubes’ full refund or replacement guarantee for total peace of mind.
EFFORTLESS INSTALLATION - Designed for quick screwing with pliers or valve tools—get back on the road faster.

The VeloTubes Presta Valve Core 10 Pack offers durable copper-nickel brass construction, universal compatibility with all Presta valves, and easy installation using standard tools. Lightweight and made in the USA, this pack ensures you have reliable valve cores on hand to maintain optimal tire performance and avoid downtime.

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Brand	VeloTubes
Product Dimensions	10.16 x 2.54 x 7.62 cm; 10 g
Item model number	PVC10
Manufacturer Part Number	PVC10
Material	Copper Nickel Brass
Country of Origin	USA
Item Weight	10 g

Presta Valve Core - 10 Pack

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