Are the cores on these tubes removable?

The valve core of the valve stem is removable.

If they come in their own individual box and from Amazon, then my experience has been that they are genuine. If they come from another seller and packaged 5 in a bag, then I have had horrible results and had to return them.

Is this product for wheel size 28 or 29 inches? connfusing description says 29, box says 28.

28in, 29in, and also 700c are the same diameter rim, they just refer to different tire widths. 27in is a different size wheel though, so look out for that.

Have any of you tried the 20/25 in a 28 tire?

Hi, I hope this finds you super well. We wouldn't recommend trying. Continental makes the same tube designated "wide" which is meant for 25-32 width tires. Happy riding!

Brand	Continental
Valve Type	Presta
Material	Butyl Rubber
Wheel Size	28 Inches
Item Diameter	28 Inches
Item Width	25 Millimeters
Compatible Tire Width Minimum	20 Millimeters
Valve Length	42 Millimeters
Item Weight	0.61 Kilograms
Manufacturer	Continental
Size	700x20-25
Compatible Tire Width Maximum	25 Millimeters
Item Package Dimensions L x W x H	7.13 x 6.57 x 3.31 inches
Package Weight	0.61 Kilograms
Brand Name	Continental
Model Name	Race 28
Part Number	CON10094

Continental Bicycle Tubes Race 28 700x20-25 S42 Presta Valve 42mm Bike Tube - Value Bundle 5-in-1 Bicycle Tube 700c

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