Reddit reviews Continental 42mm Presta Valve Tube (2-Pack, 700 x 32-47cc) Slim
We found 1 Reddit comments about Continental 42mm Presta Valve Tube (2-Pack, 700 x 32-47cc) Slim. Here are the top ones, ranked by their Reddit score.
Premium Inner Tubes Preferred by champions and riders worldwideCreates a consistent tube that is perfectly roundPreferred by champions and riders worldwideIn Original Continental Box
You bought (700x38) a fair bit larger tire than came stock (700x28).
The tubes you bought are 700x20-25.
Basically they are too small. That being said, you can probably make them work. Just bear in mind you are more likely to flat as the tubes have less material to fill the casing of your tire. If it's easy enough you should probably try to size up to these at 700x32-47 (which contains your 38 in the range)
https://www.amazon.com/Continental-Presta-Valve-2-Pack-25-32cc/dp/B01CYTV4P4/ref=sr_1_3?s=sporting-goods&ie=UTF8&qid=1502972845&sr=1-3&keywords=inner%2Btube%2B700&th=1&psc=1