自転車で 秒が大事なんだ
27g
http://auonlineshop.kddi.com/disp/CSfLastGoodsPage_001.jsp?GOODS_NO=4514&dispNo=001007014
68g
http://auonlineshop.kddi.com/disp/CSfLastGoodsPage_001.jsp?GOODS_NO=4509&dispNo=001007014
BT3 37,584円
http://www.gizmodo.jp/2014/04/gear_fit_1.html