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I think something like this? I have to sacrifice all of my 7/8" tubing to do a cantilever, so if I want to build matching bars, I might have to buy more, but this is the way to go, I think.
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So the triple tree I wanted to use for this bike is one I've had for a while, and I'm using it specifically because the holes for the legs are 1", and that's the size tubing I have in stainless. It also has a 1" head tube, which is what this frame is. The issue is that it's way too narrow for the 3" rims I have, so I'm playing around with a plate to offset the legs, since to use bends to do the offset would make the forks longer than I'd like.
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Seat post on, a little more of the frame welded out, and fork legs smoothed out.
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So, I did make a miscalculation, and ended up making the fork legs too short. Should be an easy fix though, to have the drops I make have a little reach down, instead of just forward.
 
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Seat on, back wheel on, and front fork done. She's a roller.
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One thing I haven't noted on my Instagram (where I'm also posting this build) is that I'm already aware that the space for the rear drops between the stays is way too tight for the Nexus to bolt onto. Not sure how I'm going to solve that yet.
 
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Seat on, back wheel on, and front fork done. She's a roller.

One thing I haven't noted on my Instagram (where I'm also posting this build) is that I'm already aware that the space for the rear drops between the stays is way too tight for the Nexus to bolt onto. Not sure how I'm going to solve that yet.
Maybe you can find or fabricate some longer axle nuts.

Oh wait, you shifting pin and bellcrank is on the drive side.

A "custom" nut with the same dimensions, but some holes on the right side. I think the Torpedo hub utilizes these on the brake side. Don't know if its the same thread, plus custom tools required:
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Or else a good ol coasterbrake singlespeed.

Love your work on the frame, beautifully built!
 
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