70sSanO

I wouldn't hold your breath until you understand exactly what SeattleJG was using in the first place.

To start off with, Trek made 2500, 2300, and 2100 frames in 1991. As far as I can tell they are the same frame with the only difference being the component group. By 1991, "most" mfg were making their high end frames at 130mm, but at the very least 128mm so they could accommodate either a 126mm or 130mm OLD.

The 1991 2500, 2300, and 2100 came with 8 Speed Dura Ace, 7 Speed Ultegra, and 7 Speed 105, respectfully.

Case in point, I have a 1991 Specialized Allez Epic of similar construction with 7 speed 105. It came with 8 speed Dura Ace, 7 speed Ultegra, and 7 Speed 105.

The 8 Speed Dura Ace was 7403 and has an OLD of 130mm.

If I measure the top of the dropouts I'll get 126mm, but where the dropouts slide it is 128mm.

I have no clue what freehub or freehub body is on SeattleJG's bike. I'm somewhat skeptical that after 30 years of people converting from 7 speed, that the fix was as easy as using a CS-6700. And he is the first person to discover this. There is no knowledge if the original freehub body was ever replaced somewhere along the line. The only way to tell is to measure the length from the cassette stop to the end of the freehub. It is also a tough sell that a 1991 UG/HG freehub body can accept an 11t since there is no relief for that size cog. I'm guessing the freehub body was replaced along the way and a spacer was placed behind the 7 speed cassette and it fits into the frame because it is 128mm.

But if it is true, it is great news and I hope no one tells miamijim that his effort was a waste.

Many late 80's/early90's bikes, maybe even the Klein Performance, were made with 128mm dropouts. If it has a 7 speed freehub body, I have my doubts you'll fit a 10 speed, but it is possible to replace it with an 8-10 speed body... been there, done that.

John

Edit Added: Think off all the steel 126mm frames that have been cold set to 130mm to accommodate more that 7 speeds.