브롬톤 12단 모델을 21단으로 튜닝해 봤습니다! 국내 최초 브롬톤 21단 튜닝 영상 입니다!

I tuned my Brompton P-Line 12-speed model to 21-speed. Korea's first? This is a video of a Brompton 21-speed tune-up. When I rode with the original 12-speed, the slope was over 13%... When I went Brompton, the extra 20kg of pack weight made it difficult for me to climb hills... So I tuned it to 21-speed, the highest gear on the Brompton. With this gear ratio, it's almost like a mountain bike... even on 20% slopes... I can ride without a bike, and even with the extra 20kg of pack weight, I can pedal comfortably. I can now ride uphill without any problems.