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Due to the national holidays as Golden Week, we will close 2018/4/28~2018/4/30 and 2018/5/3~2018/5/6.
This may cause delays with our responses. Thank you for your understanding.
There is a pretty tough slope at the place where I always go, and I can not go up with 28 of the existing TZ - 20 's teeth.
I was satisfied with climbing upright sitting after exchanging with TZ - 30 with 34 teeth.
As I changed the chain at the same time (I was very dissatisfied with this chain), I am satisfied with my connection well.