I am trying to buy continental bike tube - 700 x 25, but the size change to 700 x 32-42 pv on the cart. why?

I found the same problem and had to buy it from a different source in order to be sure I was getting the correct size. It’s an amazon problem.

Is this 650cc or 700cc? The name says 650 but the picture shows 700

It is 650cc. Bought to install on my older SCOTT road bike.

Will it fit a 25x700c tire?

Yes. I just put these in my 25x700 and they fit.

will this work on a trek fx3? I'm confused about the length of the valve for this bike? 42mm OK or longer?

This has nothing to do with the bike but rather with the wheel or more specifically with depth of the wheel. If you wheel is X mm deep you will need at least X +15 mm long valve. Example: you wheel rim is 25mm deep. You will want tube with at least 40mm valve. Longer is OK but at some point it will impair the aesthetics.

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🚴‍♂️ Elevate Your Ride with Continental's Premium Tubes!

VERSATILE FIT - Unitube system accommodates a wider range of tire sizes.
INNOVATIVE DESIGN - Vulcanized for uniform roundness and enhanced reliability.
UNMATCHED QUALITY - Each tube undergoes rigorous 100% quality control inspection.
RIDE WITH CONFIDENCE - Premium inner tubes trusted by champions and riders worldwide.
CONVENIENT CUSTOMIZATION - Removable valve cores for easy sealant application.

The Continental 42mm Presta Valve Tube is a high-quality inner tube designed for mountain bikes, featuring a seamless vulcanized construction for superior reliability and compatibility with various tire sizes. Each tube is rigorously tested to ensure top performance, making it the preferred choice for serious cyclists.

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Bike Type	Mountain Bike
Color	Black
Size	700 x 25-32 - 42mm Presta Valve
Style	Inner Tube
League	Presta
Height	1.5 inches
Weight	0.8 Pounds
Material Type	Rubber
Number of Items	1
Season	Year-round
Usage	cycling
Sport	biking
Wheel Size	26 Inches
Included Components	no
Batteries Included?	No
Brand	Continental
Department	unisex
Manufacturer	Continental
Item model number	0181921
Product Dimensions	5 x 3 x 1.75 cm; 139.99 g
ASIN	B008ZTM95C

Continental42mm Presta Valve Tube

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