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Wednesday, December 31, 2025

Convertible mbb to fbb part2

After a quick trip around the block - 
 
it all went ok but - 


the chain is hitting on the V-brake boss. A bit of sawing and angle grinding should fix this!

Bosses for V-brakes added.

Split in boom.

Adding 2 bracing tubes. There is a stick of aluminium shoved over the tyre as a heat shield.

After tacking support tubes into place.

Update 1/1/2026

I rode it around the block and it goes well! There is a small issue with the chain rubbing on a brake boss which a bit of sawing and angle grinding will fix but otherwise good!  In terms of a name and colour scheme for the front bit, I think it has to be X15 mkII. Some of the boom clamp mechanism is reminiscent of this much earlier bike ,  which was named after the orange paint colour used at my old work at CMG electric motors. As well, there's bits of orange paint still left on the steerer frame from the original donor bike which is begging to be restored, and the colour is a nod to my last moving bottom bracket bikes which were orange Cruzbike Quests.

Hi

Today I spent some time on this bike, and had done a bit of work previously, and now I am within striking distance of finishing the mbb part of this bike. The bottom bracket boom is now splittable and is braced from below. When I tacked up the bottom bracket bracing I was careful not to let the brazing interfere too much with the bottom bracket threads. 

With a bit of luck I will test ride tomorrow! Happy New Year!

Brake removed to show v-brake boss detail

More detail: 4 holes in steel strip altogether, 2 on the edge simlify bending, 1 holds the spring retainer pin and the large one is tapped M10 for a standard v-brake frame boss.