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Made some good progress over the weekend and Tuesday night.
All fully welded, braze-ons done, and pretty well re-aligned (I put way too much heat into the motor mount and stuff moved a lot -- it's hard sticking a massive casting and thin wall tubing together).
Pics of it mocked up with the fork and a (skinny) front wheel. It's a weird looking bike for sure -- super long and super low. -
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Also managed to mitre the seat stays. I hated this fixture the first time I used it, but this time (with some more thought and patience) I managed to get these fitted pretty well spot on straight from the mill. It helped that I had a brand new carbide end-mill to machine the dropout slots and avoid fucking around with slitting saws.
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Good progress over the weekend.
Pulled apart a perfectly good, sensibly sized wheel (anyone need a brand new 27.5 Stans Flow?) to make this ridiculous looking wheel with 145mm long spokes. It's a real hassle building small Rohloff wheels -- they're very fussy about where you're allowed to cross the spokes, and the spoke angle from the hub flange. This is the best solution I came up with: all spoke heads out, and with crosses avoiding the hub cap bolts.
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Good question, I don't think so though... they list spoke sizes for 20" rims and build instructions in the manual.
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The brilliant 18 Bikes up my way tend to keep stock of belt drive stuff. Often best to call them rather than rely on the website.
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Bit of a mare yesterday. Managed to neatly mitre the chain stays in the Bridgeport with a slitting saw for the drops and a massive end mill for flattening where they attach to the motor mount, and then promptly squashed one side when I carelessly moved the head to machine the second side. I should have ordered a 5mm end mill (only had 6), waited for it to arrive and done the slots from above, but I was feeling impatient. Lesson learned.
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I built up my Speedhub to a Stans Flow a year or so ago for a winter hardtail project which got shelved/replaced with a Pinion.
I now need a Rohloff for my cargo bike project but with a 20" rim. I can't stand the thought of de-lacing a newly built wheel, so I thought I'd gauge interest on here if anyone needs something like this spec and pick up a hub on its own...
The rims/spokes are brand new, the hub has had plenty of use, but will have fresh oil before being sent. It has external box, can supply with new cables and rotor. Speed bone, tensioner, etc in box can also be included.
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The motor mount is rank, but this is a prototype. I'd like to do something neater and laser cut out of plate for the next one.
The Bridgeport makes holes nice and easy -- these are for the battery mount, so it kinda matters that they are in the middle of the tube.
The front triangle is almost ready for welding -- I need to work out LOADS of cable routing first though.
It's really nice! Unfortunately not mine -- I rent a bench from a (far more capable) pal who does this for a living!