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I got a bit done tonight.

I removed the paint from the rear rim, and drilled it like the front. I got the rear wheel laced up (stock spokes, 3 cross), installed a lighter tube, the cassette, and got the wheels on the bike. Also I got the rear brake lever and shifter on.

Current weight is 47.4. Still 1 pound lighter than stock!

Next is to get a rear rotor, cables, chain guide, and chain tensioner.

Its starting to look like a legit mountain bike!

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Thanks Luke! The fork is close to 10lbs. Im sure with the stock fork it would be 40ish pounds. I was doing a bit of math, and I think I could take 3-4 pounds off the fork by making aluminum legs for it.
 
Last night I got the rear derailer hooked up and tuned and made a front chain guide from an old front derailer. The guide bolts on to the tab for the chain guard. I would post pics, but Im out of bandwidth on my photobucket account until Thursday.
 
Ok, so I set up another Photobucket so that all my pics arent sharing bandwidth.

Last night I got the rear disc brake setup. At this point it a fully functional mountain bike!

Here are pics of the chain guide, the rear brake, and some overall shots. Time to start planning the rear suspension!

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I also got this rear shock. Im hoping for about 6" rear travel. This shock has a 2 1/2 inch stroke, so 6" should be obtainable as long as the wheel doesnt hit the seat tube. I am going to raise the bottom bracket a bit also, I've hit the ring a couple times on big logs...

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Most of the weight I lost, I gained back with the fork. On a downhill in the dirt yesterday I got it up to 29.1 mph. It felt super stable.
 
Ya its super stable!

I am hoping to get started on the rear suspension tonight. I'll post pics if I do...
 
I started on the rear suspension tonight.

This is where I knew I had to commit...

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I wanted to at least get the main lower pivot done.

So first I cleaned the front triangle where the welds were:

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Then after measuring 100 times i welded on the tabs for the pivot. I may gusset these at some point. Then I welded the pivot tube to the rear triangle. And then I got it bolted together. Next step is to cut off the seat stay and add pivots to them.

Ill let the pics do the talking:

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I ended here for tonight. Hopefuilly I get some time with it tomorrow...
 
You have lost your mind and I hope you never find it! This thing is sick! I hope the executives over at Mongoose see this and take some good notes, I know I am.
 
I got some more done tonight...


First I cut off the seat stays so that I could get an idea of MAX travel. It looks like 6.5 inches is safe:

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Then I finshed up the chainstays where the pivot will be:

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Then I made the link ends for the seat stays:

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Here are the 2 pieces loosely bolted together:

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Then I started mocking up the shock mount and main pivot:

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Next will be to weld on the main pivot and start figuring out the upper links!
 
Are you getting your suspension geometry from another bike? or are you just going with it?
 

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