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.

ASIN	B008ZTM95C
Best Sellers Rank	#6,676 in Sporting Goods ( See Top 100 in Sporting Goods ) #34 in Bike Tubes
Bike Type	Mountain Bike
Brand	Continental
Brand Name	Continental
Compatible Tire Width Maximum	32 Millimeters
Compatible Tire Width Minimum	25 Centimeters
Customer Reviews	4.5 out of 5 stars 5,446 Reviews
EU Spare Part Availability Duration	2 Years
Global Trade Identification Number	04019238556858
Included Components	no
Item Diameter	7E+2 Millimeters
Item Type Name	Continental R28 Training Presta Inner Tube - Black, 700C x 25 - 32 C/42mm
Item Weight	4.94 Ounces
Item Width	25 Millimeters
Item diameter	7E+2 Millimeters
Item width	25 Millimeters
Manufacturer	Continental
Manufacturer Part Number	TUC81921
Material	Butyl Rubber
Material Type	Butyl Rubber
Model Number	0181921
Size	700 x 25-32 - 42mm Presta Valve
Unit Count	1 Count
Valve Length	42 Millimeters
Valve Type	Presta
Valve type	Presta
Wheel Size	26 Inches
Wheel size	26 Inches

Continental 42mm Presta Valve Tube

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