Nhớ hồi 4 năm ĐH, chiếc xe đạp cà tàng đụng vào đâu kêu đó: yên xe cọt kẹt, xích líp nhộn nhạo, đùi đĩa lắc cắc, cả cái xe đụng đâu kêu đó… duy có một cái đụng vào không kêu tiếng nào… là cái chuông!
thương nhớ mười hai
Category: biking
rohloff
Mơ ước nhỏ nhoi của em… xe đạp sử dụng hộp số Rohloff cùng với truyền động trục (shaft – drive – transmission). Hệ truyền động kín, không lộ bất kỳ phần chuyển động nào ra ngoài, Rohloff speech hub (hộp số 14 cấp Rohloff cho xe đạp), xài bánh răng, cơ chế tương đương, nhưng hoàn toàn khác derailleur (bộ đề). Shaft – drive – transmission: truyền động bằng trục như ôtô, xe tải chứ ko xài chain (xích)
folding bike
A new toy, a “towing platform” for the kayak, a GIANT tiny folding bike that can be carried on the boat through the waterways! Steel frame, 20 inches wheels, 6 speeds derailleur gears, and weighted at 15 kg, this is the best balance I can find: small enough to be folded and transported on the kayak, while still large enough to be able to attain some speed while towing the kayak in return on long roads! To be used in my upcoming trips!
bike speedometer
A recent add – on to my bike, a speedometer, image on the left is captured with my phone while on the ride. Quite a bunch of features inside a cheap electronics mounted on the handlebar, it can show the following information: current speed, maximum speed and average speed, distance (odometer), and time (current time, ellapse timer, stopwatch timer). I did want an advanced device with more features: GPS and mapping, heart – rate monitoring, temperature, humidity reporting… but such an device is even more expensive than the bike itself.
So basically distance, time, and velocity is what you need to keep track of your daily exercising already! Just wonder how the devices works: a magnet is attached to the front wheel, opposite to it, in a stationary position is a magnetic sensor, each round the wheel rotates, the sensor updates a counter, then all other things are just simple calculations with a built – in quartz clock!
Update April 26th
Here is the statistics read from the speedometer after 5 days (with 1 day off), total travel distance: 102.1 km, total time: 6h 23′, average speed 15.9 km/h, maximum speed: 33.5 km/h, average biking per day: 25.5 km, average time spent per day: 1h 36′, quite a serious physical exercising indeed!.
Update May 3rd
Counters updated after 12 days: total travel distance: 287.5 km, total time: 16h 55′, average speed: 17.0 km/h, maximum speed: 37.5 km/h, average biking per day: 23.9 km, average time spent per day: 1h 25′. See declines in time and distance, but some improvement in average (sustained) speed!
Update May 17th
Just pass the first 500 km today, 507.9 km to be exact, total spent time: 27h 10′, average speed: 18.7 km/h, maximum speed: 37.9 km/h, average biking per day: 20.3 km, average time spent per day: 1h 5′. I was biking less these days, but the sustained speed is steadily improved!
