Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Are these usable when riding a bicycle and wearing a helmet?
Document: Have had these forever and quality is excellent. Lost my pair, bought replacements & still diggin' them. Sound quality is great and they sit on my ear confortably. I often have discomfort after wearing ear buds for a little while and I like that I can hear the outside world if need be w/this style. I use them under my helmet at low volume when bike riding and they work great. Or wear them at home when watching a movie but still want to be able to hear the baby monitor.
For the price, you can't beat them. I integrated these into my motorcycle helmet and they work great with the FIIO 6 and the FIIO L9 LOD cable. With this combonation, they work and sound great and are plenty loud enough to over power the many noises of riding a motorcycle.
I use a Chatterbox when riding my motorcycle, but the speakers that came with the Chatter box are absolute junk. I bought these to take apart solder in place of the chatterbox speakers. They have decent sound and have really made an improvement over what I had in my helmet before. Can't say anything about comfort since I ripped them apart right away, but decent sound quality.
i had to cut the plastic housing around the driver to fit and some simple soldering, but i should have done this years ago. when playing music inside my helmet now became much louder without needing to turn up the volume as much. i also downloaded a free equalizer/music player phone app that allows me to turn down the highs (treble) a bit and now i have a pretty sweet setup for listening to music while riding.
I use my earphones while (1) Riding on the bus, (2) Riding on my bicycle, (3) Walking and hiking, and rarely otherwise. Top sound quality is something I would like to have, but I'll never get it, even with the finest earphones, because I use them in noisy environments. Fairly good sound is the best I can hope for. On the other hand, practicality and comfort matter greatly to me.
Bought these for wearing inside my motorcycle helmet as ear buds do not work for me.Just pop off the ear clips and place them between the fabric and the foam by your ears, they have a really good sound and if placed correctly, do not rest against your ear at all. So they are very comfortable.Worth more than what you pay for IMO
first things first. these are never going to POUND bass... you'll need proper hi-fi closed or open headphones to do that. but if in-ear buds hurt your ears when wearing them for extended periods, or simply won't stay in, these are great. the reason i bought these were to take them apart and replace the crappy blown speakers in my in-helmet motorcycle communication system (scala G4).
For me, that's a plus most of the time -- e.g. while riding a bike, you don't want to shut out the world. Buy them.
It is uncomfortable. it is difficult to put around the ears. The ear clasps keep coming off which is irritating when on riding mower.
After around 50 hrs of music having played through these, the music sounds great; They amaze me whenever I'm listening at the rich sound they produce while I'm riding in the car or just away from home; these are great portables.
Answer: I think it'd depend on the helmet.  If the helmet covers any part of the ear (or comes within about a half inch of the ear), it likely wouldn't work. The headphones are a bit bulky.