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Discussion Starter #1
I'm looking to put 4 or 6 piston calipers on my '00 Katana. Possible updating my rotors and master cycl too.

The caliper mount hole centers seem to be about 55mm on the fork legs.

The stock rotor is about 11.5 inch in diameter.

The outer rotor surface to inner caliper mount surface on fork leg distance is about 12mm.

Are these specs anything close to a GSXR fork leg and caliper/rotor setup?

Ideally I'd love to find some 6 pistons that would mount up.

I've already contacted TAW, Braking, EMA, Spiegler Brake Systems and frenotec.

None of these companys seem very interested in researching and figuring out what will work on my bike. Guess they don't want my money. Too bad for them. One way or another I'll have better brakes on my bike if I have to figure it out myself.

Any have any idea on how I can figure out what brakes will fit and work best? thanks
 

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Discussion Starter #2
Ok, I can easily understand no one would know my problem but is there a place I can at least find measurements of older GSXRs brakes?

Like rotor diameter, caliper mount bolt spacing, etc?
 

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I found this on 7/11 boulevard under parts compatability list.

7/11 boulevard

GSX-R front wheels

Model
Wheel size Axle diam. Disc diameter
85-86 750 18xMT2.50 15 mm 300 mm
86 1100 18xMT2.75 15 mm 310 mm
87 750 18xMT2.50 17 mm 300 mm
87 1100 18xMT2.75 17 mm 310 mm
88 1100 18xMT2.75 20 mm 310 mm
88-94 750 17xMT3.50 20 mm 310 mm
89-94 1100 17xMT3.50 20 mm 310 mm

GSX-R rear wheels

Model Wheel size Nr. of bolts Disc diameter
85-87 750 18xMT3.50 5 220 mm
86-87 1100 18xMT4.00 5 220 mm
88 1100 18xMT4.50 5 220 mm
88-89 750 17xMT4.50 5 240 mm
89 1100 * 17xMT4.50 6 240 mm
90-94 750 17xMT5.50 6 240 mm
90-94 1100 17xMT5.50 6 240 mm

I hope it helps.

-Dave
 

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Well...before you get eager to do this consider these four measurements...

1...the diameter of the center hole.

2...the diameter of the mounting bolt pattern.

3...the diameter of the rotor.

4...the amount of offset.(I'll measure it from inside of rotor to the center of the braking surface)

For instance...a '96 750 rotor is...
1-69mm
2-91mm
3-320mm
4-0.0mm (that means it's flat)

An original '86 750 rotor is...
1-61mm
2-81mm
3-310mm
4-18mm

a '94 750 rotor is..
1-64mm
2-81mm
3-310mm
4-18mm...I'm not sure without taking the rotor off the bike and measuring it like I did the other. But I think it is the same offset.

You'd be better off measuring your rotors first so you have hard data for those brake companies. Also, keep in mind those guys are making parts for a certain demographic. That would be the guy with the "race bike" that needs modifications...CBR's, R6/1, newer Gixxers, Ninjas...or the tubs of goo that ride cruisers, Hardleys, 'Old Wings...they need chrome plated turds to hang from their grips.

Where in Wisconsin are you? I'm in Madison.
 

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If your rotors match up to the measurements for the 95 750 (and I think they will) I know that the six piston calipers from a 94-98 1100 or 93-95 750 will bolt up as the bolt patern on the calipers is the same.
Bones
 

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Parts between the GSXR/GSX series are pretty swappable but the further you get from the motor the more dubious it becomes. Katana rotors (at least the old style Katana) are 300mm so they are smaller than GSXR rotors. 1st thing to do is look at the caliper mounting. If you can swap calipers between a Katana and a GSXR then you can use the 6-piston calipers from the later GSXRs or the TL1000. You might have to swap discs to get the right diameter disc. And you'll definitely want to get the matching master cylinder for the 6-piston calipers as I hear the swap is worthless without that. No offense but being that the Katana isn't the hottest bike to begin with most people don't spend a whole lot of time doing swaps like this so you'll probably have to figure it all out for yourself. Worst case you put the larger GSXR rotors on there, find a set of calipers you like, and have a machine shop make up adapter plates to fit them.

Frankly I think you'd be better off looking for a complete GSXR front end (I suspect the 89-95 front ends will be a bolt-on swap). This will get you better brakes and better suspension all in one (even upside down forks if you want).

Or you could just put some grippy pads in the Katana calipers and call it a day.

Matt
 

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Discussion Starter #7
Ok I took some pics and measurements as best I could with my dial caliper with the wheel on.

Outer diameter - ~292mm
Rotor center hole dia - ~64mm
Caliper mount bolt center to center - ~55mm

Here are a few pics:
Side1
Side2
Top mount area

This is off a 929 and looks to have similar bolt spacing (I measured it) and angles.
929 caliper

As I see it, there is no real way to tell what will fit unless one actually tries it. Hopefully my local salavage yard will let me return calipers if they don't work out.
 

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Hey Destroy, have you thought about EBC rotors, HH pads and braided lines? All are much easier to deal with than the swap like your thinking of doing. You can also get remote style master cylinders with either a 14mm or 5/8's bore as an upgrade. The rotors, pads, lines and a good bleeding would probably get you the braking your looking for.

Here's a link to Max-Suzuki and a guy that just did this same upgrade to his Kat.

http://www.maximum-suzuki.com/cgi-bin/ikb/ikonboard.cgi?s=3d51ada7149affff;act=ST;f=21;t=8179
 

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Discussion Starter #9
I may just try those EBC HH pads. Seems everyone who trys them really likes them and sees huge improvements.

What the heck is it about those pads that make them so great over others? <shrug>
 
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