Tetsuya you obviously have no idea what Beats by Dr Dre are.
Solo
http://www.bestbuy.com/site/Beats+By+Dr.+Dre+-+Monster+Solo+Over-the-Ear+Headphones+-+Black/9492408.p?id=1218113928461&skuId=9492408&st=beats%20by%20dr%20dre&cp=1&lp=10
Solo HD...
I was just wondering, if you biked a flat surface at a certain rotations per minute or second and you biked the exact rotations going up a hill would your speed be the same?
