I just scored a late 80's early 90's Trek 990. It is mostly original(different wheels). It has 3 cables running along the top tube, with the FD being a top pull with XT non-indexed thumb shifter. The RD is indexed. I can't tell you more then this because the bike is at work. I'll let you know more next week. If I forget please email me and I'll get more info to you. Charlie(another one)