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Mark,I think that bottom bracket clevis clamp is pretty standard on many low-end duallies. So find a cheap donor to give you the bits to weld in a new section. Keep the original part safe. It would need some narrowing as part of the re-building process.

This is actually going to mainly be for around town, and some longer rides. Not going for speed, and just using mountain shifters. Only need the right side. No front derailleur for me ever again! I do not like front derailleurs.

Yep. They are 700 by 28. Just enough clearance to fit comfortably at the fork. I found the 11 speed wheelset with a SRAM 10-42 cassette in the Goodwill last year. So a tiny fix later, I had a really nice wheelset for dirt cheap. I have planned the whole build around them. You'll notice that I...

Some bits of significance. I had to watch Ebay for a bit to get the right 1.5 inch stem at a good price. Someone got the first one I found. 1.5 inch was made for downhill and freeride, but is not super common. I rotated the seat base 180 to get the seat lower with nose up a bit (better...

I have most of my parts now, and have figured out a 1.5 inch pivot and boom clamp.

Might be worth treating yourself to a T50 as well! ;) That old Sofrider may not be worth the hassle.

Yep. Smaller pedaling circles. I am trying 160s on my new bike that I am building, and 155's on my old Sofrider because the seat sits higher already.

You can get four bolt 104 BCD narrow wide rings all the way up to 52. So if you're OK with a Shimano mountain type crank, you're good.

But someone did do it anyway!

Very cool! I have now tested flipping the seat-mounting plate 180 degrees. It effectively moves the seat position back a bit. So there is an option to get a little more "room", and a higher bottom bracket height.

I've done that for a couple feet, by accident/necessity a few times. Soft landing is normal. Note that the landing is not really super-soft in the video either. He is bouncing a bit.

Going with a 1 by 11. I hate front derailleurs! :) Also found the 1.5 inch slider tube that fits, and 1.5 inch short stem to go on it. Just need to figure out the proper pivot clamp for the 28.6mm steerer to 38mm slider tube. I have a couple ideas for it already. Waiting on a camera (old one...

I went with the yellow based on a couple real-world photos that have been posted. It is indeed the "Vendetta" yellow. Looks really nice. A far cry from the pale yellow shown on the product page. ;) Makes me wonder if the blue is also far more luscious then the product page image? Anyway. I'll...

You could also use a stem riser to gain a few inches of height, instead of whole new slider. https://www.amazon.com/Handlebar-FOMTOR-Bicycle-Extender-Mountain/dp/B075FL6JXP

Hi Craig, Thanks for info there. I'm working on on Emeljay mod idea, but with a 38 mm slider that goes over the lower T50 boom. So a 1 1/8 stem clamp and 38mm (1.5 inch) clamp is where I'm headed. I've got one halfway fashioned already using 1.5 inch rollbar light clamps. But thought I would...

I am curious what the OD of the boom slider is, and if the pivot clamp can be purchased separately?

Chains are basically a whole bunch of bushing-bearings (chain pins) all interconnected. I suppose there could be one of these with bushing bearings instead of roller bearings. How long does your chain last? So far drive shafts are simple and durable, but not efficient. I wonder if it needs...

Looks all there to me. :) Suspended and unsuspended bikes. Gearbox for frame mount or hub/crank-gearbox. 7 or 12 speeds. Much more refined designs now. My only concern is having the cranks so low. I'm used to having them at seat height, or a bit higher.

Do you have a current asking price, or shall we just bid based on based on your original cost?

Here is a video just about it.