If you commute on flat ground, you can use a lightweight racing bake and narrow tires. Unfortunately, that does not work for forest roads on my commute, so I ne

If you commute on flat ground, you can use a lightweight racing bake and narrow tires. Unfortunately, that does not work for forest roads on my commute, so I need a heavier trekking bake with wide tires (with a lot more friction). Moreover, if you can do 50 km/h of sustained speed, you should become a professional cycler. The world record is around 55 km in an hour. Pro cyclers can only sustain > 50 km/h speeds for shorter periods: https://books.google.de/books?id=-TpDCgAAQBAJ&pg=PT79&lpg=PT79&dq=wiggins+440+watts&source=bl&ots=8Cx_n__gbF&sig=Phwz9j7aLagk9yHlFx_o0Sbo2jQ&hl=en&sa=X&redir_esc=y#v=onepage&q=wiggins%20440%20watts&f=false https://books.google.de/books?id=-TpDCgAAQBAJ&pg=PT79&lpg=PT... Of course, short stretches of 40 or 50 km/h is doable, but most fit cyclers cannot sustain that for 3 mile stretch. So, either you are near-pro or overestimating your average speed ;). Ps. I pass the vast majority of (clearly non-recreational) cyclers (> 95%).