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1997 Giant ATX900 Disc Brake upgrade

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Dwaynerbear

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Discussion starter · #1 ·
I have been updating and restoring my old Giant ATX that I used to race when I was growing up and have modified it along the way to a more modern spec. Part of the update was to add modern disc brakes, rather than the post mounted V Brakes that were used all those years ago.

This process has taken me quite some time and I have been dabbling back and forth with for about 6 months now. The plan is to CNC the part when I have the design complete and have it made from Aluminium 6061.

If any of you are aware of or remember the ATX frame you will know that it has no mounting points for a caliper as it was released just before disc brakes became the norm. To get a mount that would work, I had to make a hybrid of a few aftermarket mounts I had seen, as well as adding my own spice to make it work!

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This project is still ongoing and I have since redesigned the bracket again. I have created many 3D prints to check for spacing and sizes, some of which are shown above. As I work through the designs I will update here until Im complete!

If anyone else has one of these frames let me know if you'd be interested in something like this as I could produce a few when Im getting them made.

Thanks for reading!
 

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Discussion starter · #3 ·
Redlands R&C said:
Cool! I like this, good idea.
Are those the Cane Creek wheels with the red hubs? I forget the model of them.
How much thicker are you making the non-drive side dropout with the adaptor and are you needing to run a wider QR skewer?
Click to expand...
Yes the wheels I will be using are Cane Creek Iodine 2 (silver hubs). The mount doesnt increase or alter the hub spacing as it is mounted to the outside of the frame and held in place by the skewer. The top of the mount is held in place by a bolt from the inside, which is normally used for the bushing. The bushing is replaced and integrated into the mount. It also has a small bearing on the inside to allow free movement when the bolt is tightened to hold it in place. I will get better pictures when I have developed the next stage and hopefully explain it a bit better how it works!

Below i have shown a picture of the part in the printer, and also where it mounts onto the frame

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#7 ·
Don't ride this. It will break the disc side chainstay.

A lot of companies broke stays around 2000 when they added disc mounts to previoiusly non-disc frames. They came back the next year with hugely beefed up or triangulated stays to take the brake torque.
 
#8 ·
Dougal said:
Don't ride this. It will break the disc side chainstay.

A lot of companies broke stays around 2000 when they added disc mounts to previoiusly non-disc frames. They came back the next year with hugely beefed up or triangulated stays to take the brake torque.
Click to expand...
While what you're doing is a very cool project, in my experience, Dougal is right about the net end results of this - the added stress on that frame where it wasn't designed to accept that force will be the demise of something you appear to hold dear.
 
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