When you're going for a ride on your bike, you want to be able to travel as light as possible, but you also need to make sure your oxygen needs are being met sufficiently. If you're not sure, or if you haven't gone biking in a while since you've started using oxygen therapy, you should talk to your doctor to see which possible portable oxygen concentrators will cover your oxygen needs while you are exerting yourself.
Your doctor might have you take a physical test on a stationary bike to get an accurate reading of how much more oxygen you need while you are riding your bike. Everyone needs to take in more oxygen while they are getting exercise or just when they are moving around a lot. If you need to use oxygen therapy, it means your lungs have a hard time bringing in enough oxygen to meet your needs while you are doing every day things, like walking around the house or even while you are sitting still. Some people need to use oxygen therapy only while they are exercising.