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PostPosted: Sun Dec 02, 2012 5:46 pm 
Dirt Disciple
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Joined: Sat Jul 07, 2012 2:33 pm
Posts: 56
I've been making a post mount rear disc adaptor for a mates Azonic VR1 (http://www.retrobike.co.uk/forum/viewto ... 946a646302) in fact it has the same colour scheme as the one in the review.
It's a great riding bike as the linkage system isolates pedalling input really well, however it doesn't have a rear disc mount and even XTR V brakes don't cut it when the going get's muddy.

I've based this adaptor on an old non working Hope C2 rear disc adaptor utilizing the hollow bolt offset drop-out and the torque reaction arm. The post mount adaptor plate is similar to the Brake Therapy one and is sized to fit the disc (155-160 diameter) on the Hope Big-Un that came with the C2 system.

Before I cut the adaptor plate from alloy I made a couple of prototypes from 12 mm MDF (messy but a lot easier to shape!)

http://www.retrobike.co.uk/gallery2/v/u ... 3.JPG.html

The final alloy shape was slightly different from the upper MDF template but it's pretty close, I used some 5000 series alloy 12.7 mm thick I found on ebay.

http://www.retrobike.co.uk/gallery2/v/u ... 8.JPG.html

Lots of filing later

http://www.retrobike.co.uk/gallery2/v/u ... 9.JPG.html

Geometry check with the old Hope torque reaction link

http://www.retrobike.co.uk/gallery2/v/u ... 1.JPG.html

The hole for the Hope drop-out adaptor drilled and the assembly test fitted on my rear wheel jig (it's really the rear of a crashed steel hardtail!)

http://www.retrobike.co.uk/gallery2/v/u ... 4.JPG.html

The M6 calliper mounting holes tapped and the calliper installed and it works!

http://www.retrobike.co.uk/gallery2/v/u ... 3.JPG.html

http://www.retrobike.co.uk/gallery2/v/u ... 4.JPG.html

I've yet to tap a hole but I want to check the assembly on the Azonic frame before I finalize that hole position.

I've got hold of the VR1 and finalized the torque arm hole position, fitting the adaptor to the VR1 was straightforward with no more filing required!

http://www.retrobike.co.uk/gallery2/v/u ... 1.JPG.html

http://www.retrobike.co.uk/gallery2/v/u ... 2.JPG.html


Last edited by CK256 on Fri Dec 07, 2012 6:58 pm, edited 2 times in total.

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PostPosted: Sun Dec 02, 2012 8:54 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4443
Location: Herts UK
nice work!


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