Salam, dear, I hv chkd the pridor,, and I like its ride, ,but I hv found some problems ,, like,, 2nd gear khatak sound,, chaincove or chain spoket sound and engine hamming,,, I also chk the one another bike in same problem, its mean its not adjustable ??? pls suggest me,,,,,i wana buy comfort ( bcz I hv backpain problem ) and tension / soundfree bike,,