Buying the correct disc brakes for an older frame

[Audible Anarchy]

I am building up a single speed on an old 2002 Trek 4300 - the frame has std 51mm IS mounts on the fork as well as an adapter for the rear of the frame. (bike was originally specced w hayes cable discs 160mm/140mm rotors)

 

As im looking to put some hydraulic brakes on the build - What im trying to find out is - will any hydraulic brakeset fit these IS mounts? If i buy any brakeset that suits my budget (along with their relative adapters for the calipers and similar size rotors as the original spec) will i be able to use them?

 

Also, how can i assure the rotors that come with the brakeset can fit the hubs? are all the spacings for rotor bolts the same? is the rotor size limited by the frame? its quite a crappy old fork - should i stick to the original spec of 160mm front / 140mm rear to be safe?

 

any advice will be appreciated

Edited December 16, 2012 by Audible Anarchy

[Audible Anarchy]

these are the specs of the hubs as far as i can tell. The hubs have an older 6 bolt configuration.

 

4300 Disc

WHEELSET

FRONT WHEEL . . . . . . Alloy, disc comp., QR hub, 36°, Matrix 550 rim

E.R.D., mm 559

Rim strip Rubber

REAR WHEEL . . . . . . . Alloy, disc comp., QR hub, 36°, Matrix 550 rim

E.R.D., mm 559

Rim strip Rubber

SPOKES . . . . . . . . . . . . 14G stainless

Front, mm 260/262, 3x

Rear, mm 262/263, 3x

OTHER

BRAKES . . . . . . . . . . . Hayes disc, mechanical

Rotor diameter 6.3 in.

Bolt circle diameter 44mm

Edited December 16, 2012 by Audible Anarchy