Shimano Mega range 7speed Freewheel 14-34T

Shimano Mega range 7speed Freewheel has a maximum of teeth number of 34. Even the highest number of teeth for 12 speed gears can go from 10 to 40, only. The Shimano Mega range can have QR to 34 gear teeth. 

It would be better to change chains and groupset but as this YouTube video shows, it is not necessary. 

https://youtu.be/ypkF2TZs8KU

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