Disc Brake Mount

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Disc brake mounts are recommended. 203 mm rotors are strongly recommended for any touring or downhill applications, as normal disc brakes can literally be melted down by long heavy descents.

  • If it is not possible to put a standard disc brake mount on the frame, it is okay to put the disc mount further out. This assumed that a 203 rotor will be used with a 160 adapter, to achieve the correct pad placement.
  • Access to the caliper mounting bolts is important. Do not block access to the bolt heads. Many mechanics will be using Y-wrenches to install and adjust the calipers, so leaving clearance for these tools is important. Additionally, make sure to leave clearance for a caliper on a 203mm rotor, in case the user wishes to install a large rotor.

[edit] Existing mounts

The Free Radical and Big dummy both have mounts for disc brakes. Each one implements this part slightly differently

[edit] Free Radical

The free radical's disc brake mount was added to the design on 2004 (citation needed). It is set further out than a standard IS mount, but will allow the use of a 203mm rotor with a 160mm adapter.

[edit] Big Dummy

The Big Dummy uses a monolothic dropout incorporating a standard IS mount. It is located to use a 160mm rotor.

This design lets the builder use a more normal 160mm rotor. However, heat dissipation problems exist for smaller rotors.

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