Originally Posted by chrisharne
I'm thinking about trying to change the spacing of the rear triangle of a 3-speed so it's wide enough to fit the SRAM dual-drive system. That would require a change from the current 110mm spacing up to 135mm. That's a big jump. Is that a stupid idea? Does anyone have experience with attempting something like this?
Well, there's a couple of different ways to look at it.
The first is that you are going to be putting quite a lot of stress on the brake and chainstay bridges. If you have a problem, that's probably where it will show up.
The second way of looking at it is that you are messing with an old 3-speed frame. It's value is next to nothing so, even if you ruin it, you won't have lost much.
The only question that I have is the sanity of spending as much money as a SRAM dual-drive system is going to cost on this frame. But then again, it's not my bike.