Topic: Speed Holes!

[srbakker]

For those if you drilling your rotors/rear brake hubs/frames (no, not really) full of speed holes, are you freehanding it or using a template or just doing it on a drill press?

Cheers,
Scott

[ekpent]

At one time on a thread here a guy was posting up some templates that people could use.Maybe it can still be dug up.

[KingCustomCycles.com]

template. center punch, drill press.

[wrenchmuch]

Here's the templates .
http://forums.sohc4.net/index.php?topic=45389.0;nowap

[ekpent]

And don't skimp on the drill bits,put the good ones in your lunchbox at work 

[srbakker]

And don't skimp on the drill bits,put the good ones in your lunchbox at work 

Haha - good advice!  Of course - the supplies I steal from work are of a different sort...

Thanks for advice and the template links everyone!

[StreetSpirit]

I'm planning to drill the rotor on my cb550 rotor at some point, but I'm also wondering if anybody has turned down these rotors for decreased thickness?  I'm thinking about running the original wheel with a modern fork/caliper.  The standard disc for the nice 4 pot caliper I have is like 3.5 mm, so I would need to lose something like 1mm off the cb's rotor. 

Bad idea?  Any options?  Guess I could always shave the caliper instead.

 

[Steve F]

There is a minimum thickness for the rotor and that number is usually cast in the rotor hub somewhere.  I wouldn't recommend going less than that number.

[fastbroshi]

+1, I think the min. thickness on the 550 rotors is like 5 or 6mm

[Danno]

the rotor will fold up if you undersize it from spec that is why the spec is there if you want more brake power drill it and add a second rotor caliper to the other side it will cost less than the conversion instructions are here on the forum

[johnny]

Member Godffery sells thinned and drilled rotors for sohc4's.
I've got one on my 350.
http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/album185/Brake+Rotors+_+Thinned+and+Drilled/