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Blasptwenty: Overdone, over-complicated mod build for video rig

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Blasptwenty: Overdone, over-complicated mod build for video rig

Old 09-09-20, 11:11 PM
  #226  
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Originally Posted by scarlson
Are those really laser-cut? Or did they use a waterjet? Just curious, I know a few lasers do aluminum but not many, and those parts kind of look waterjet cut.

That little pip that goes inside the spring? Easy to turn on a lathe. PM me the dimensions if 3D printing doesn't work.
They were made by oshcut.com, who seem to put a fair store into marketing that their parts are laser cut, and not waterjet - if their FAQ is to be believed. Can always ask them for clarification, but I'm happy with the results.

PM incoming on the collar/pip.

-Kurt
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Old 05-17-21, 05:58 PM
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I've barely touched this thing - but I was able to score one of these modern Raleigh headbadges off eBay. It's irritatingly oversized in comparison to the originals, but the scheme fits, and it's marked Nottingham, England instead of Cycle Company USA, so...on it went:




-Kurt
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Old 07-04-21, 03:27 PM
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Update time.

First off, I wasn't thrilled about running the electric assist on a simple PAS hall sensor and had lost interest because of this.

In the meantime, brand-new service parts for JUMP 5.5 and 5.0 shared bikes have hit eBay, which means for $38, I was able to snag one of these - a torque-sensing Bafang bottom bracket.



These are notorious for the wiring pigtail getting wrecked in disassembly, because the bottom bracket unit indexes to a spline in the left cup (the left cup has an additional threaded insert with the actual BB shaft support bearing; you can see it backed out in the picture). If you turn the left cup to disassemble the BB, you tear the wire. As such, it's next to impossible find these used.

So out came the PAS sensor:



...and that's when I discovered I had refaced the BB to 73mm, not 68mm. Enter the BB facer. I brought it down to 65mm so I'd have freedom to adjust the chainline with spacers.




Checking the new hole for the PAS wire. I'll probably have to hit this with silicone to prevent the BB from filling up with water. I really don't want to drill another hole at the absolute bottom.



BB installed. 1.5mm spacer on each side plus the chainguard mount. Roughly 1.5mm drive side offset.



This is the result. Unfortunately, I don't have a 50T 130bcd chainring yet, so I hung everything - temporarily - on a sinfully UGLY dual BCD 48t ring. The spiderless crankarm is available as a set from Amazon for Bafang mid-drive kits.



The spider sits separate of the crank on its own spline (which is cinched down using a ring that has Shimano's standard - and IMHO, lousy - sealed BB pattern):





Today, I also found out that the aluminum SRF-3 hub shells are narrower than an AW shell. As a result, FW innards will NOT fit. Looks as if I'll have to re-lace the rear or make do with the SRF-3 (which, honestly, should do just fine).

-Kurt
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Old 07-10-21, 07:00 PM
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The new chainring arrived, which allowed me to button up the entire crankset. I was also able to use some 1X chainring bolts I had bought for this project and subsequently didn't use.



It isn't as good looking as it was before, but the new crank does fit a bit better than the Crack Brothers piece.

This baby has some serious Q factor now, but my knees tend to prefer the wider stance, so I'm not complaining.



The chainring is one of those modern narrow/wide setups designed to keep 1X drivetrains from popping off. This also meant the half link had to come out and - for lack of spare cogs - I reinstalled the 16t that was on the Sturmey hub before so the axle wouldn't be hanging mostly out of the dropout slot.







I also re-bent one of the spare fender stays for the front edge of the front fender, making use of a fairly odd, but effective mounting point:



Some overall pictures:





-Kurt
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Old 06-03-22, 09:13 AM
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Any updates on this bike? Have you been able to use it for its custom purpose? I enjoyed following the progress and seeing all the modifications.
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Old 04-20-23, 10:40 PM
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Originally Posted by cudak888
I've thought of it. It also has mounting surfaces built in too.

Thing is, I have no experience with them, nor do I want to rip one apart (especially since I've never had an experience to own a good one). Fact is, I would be more readily willing to add suspension to the rear of the Twenty (especially since I have a wrecked ProFlex kicking about that I can use for inspiration + parts) - not that I want to - before I'd want to desecrate a Moulton.

I also don't know just how soft the Moulton suspension is. Then again, I don't really know what I'd get out of anything modern either. Toying with the idea of one of those ill-advised, mad scientist homebrews.

-Kurt

How times have changed!

Any plans to make a 'Marinated Moulton mount'?
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