Topic: Drilling discs

[timtune]

I sent mine to Jeff at Godferry's Garage in Wisconsin. In addition to drilling he thins them and replaces the hardware that attaches the rotor to the hub. If you want to add a 2nd disk to your front he will countersink the bolt holes to make it easier.

I highly recommend him. https://godfferysgarage.com/

Those bring up my next question. How much material can I remove? Those look like they would be close to the limit.

I am not disparaging Godferry’s work, but there is a practical limit to material mass to dissipate heat generated through braking, as well as stress on thin material (especially stainless). If you punch too many holes and thin the discs too far, they will not endure and are more prone to warp age from heat.

Modern rotors have hole and slot patterns that are a mathematical ratio to the mass and surface area. Do the calculations and be your own judge on how much is enough or too much.

Way too easy. I have time and I'm keen to give it a go.