速報APP / 運動 / Optimum Crank Length

Optimum Crank Length

價格:免費

更新日期:2020-04-27

檔案大小:7.0M

目前版本:1.1-full

版本需求:Android 4.3 以上版本

官方網站:https://sites.google.com/view/nunoamorimappsforcycling/home

Email:dev.nunoamorim@gmail.com

聯絡地址:Rua Movimento das Forças Armadas n.º 27 1º ESQ Alcainça 2640-728 S. Miguel de Alcainça PORTUGAL

Optimum Crank Length(圖1)-速報App

This app will allow you to calculate the optimum crank length (OCL) for your bicycle according to your body anatomy. The calcs will take in account the knee angle when the pedal is at the bottom and at the top, to help protect your knees from injuries.

Besides the OCL, this app will give you the "Seatpost Length" and "Maximum Frame Size" for your new crank length. If your bicycle is a road, mountain, trekking, cross, single speed, city, recumbent or even a trike or a velomobile, the OCL is still valid because it only depends on your body anatomy plus the pedal and shoe heights.

Its also included a "Take Care" results section to protect your hamstrings from overstretch. The app will give you two scenarios, where the first one is the "Initial Setup" and the second is the "Final Setup". The idea behind this calc is to protect the legs from overstretch but at the same time to protect the knee from bending too much. The cyclist should set the "Initial Setup" and increase the seatpost length with time by small amounts until the "Final Setup" value is reached.

Optimum Crank Length(圖2)-速報App

To find out your OCL, 8 parameters are necessary:

(1) Total Height with Shoes

(2) Total Height

Optimum Crank Length(圖3)-速報App

(3) Seated Height

(4) Upper Legs Width (or HJCR Height)

(5) Knee Height

Optimum Crank Length(圖4)-速報App

(6) Ankle Knuckle Height

(7) Ankle Knuckle to Ball Foot (or to Axis Pedal Center)

(8) Pedal Height (Flat or other type )

Optimum Crank Length(圖5)-速報App

For the "Maximum Frame Size" and "SeatPost Length", 3 parameters are necessary:

(9) Saddle Minimum Height

(10) Saddle Position (back or fore)

Optimum Crank Length(圖6)-速報App

(11) Seat Post Angle (0 to 90 degrees)

You can use this info to find your Optimum Crank Length because everyone's anatomy is different and using a standard crank length (170/175 mm) might not be the best option for you!

The default angle for maximum leg extension is 155 degrees, for minimum 70 degrees and for the ankle rotation 20 degrees. In the "Settings" you will be able to change those values according to your preferences.

Optimum Crank Length(圖7)-速報App

You'll be able to save your own parameters, your friends or family, and edit or calculate it later on.

The parameters can be in mm (SI) or feet and inches (imperial) and must be defined in the "Settings".

If you want to test this app first on your device check out the FREE Version. The FREE version will show the calc results as zeros, but the functionality is the same.

Optimum Crank Length(圖8)-速報App

Protect your knees and enjoy cycling more!