GPZ front brakes

I have a set of 279mm front brake rotors that bolt up the early 80's gpz style front rim. according to the manuels I have the GPZ bikes had rotors of 260mm. Does anyone know what had the 279mm rotors maybe a later GPZ? Thanks

Kawasaki Brake Disc Measurements

Z1100A1-A3 shaft. Front disc =236 mm, rear disc= 236 mm.

GPz B1 twin shock model. Front disc = 236 mm, rear disc = 236 mm

GPz B2 twin shock model. Front disc = 246 mm, rear disc = 236 mm

Z1000J. Front disc =236 mm, rear disc =236 mm

GPz 1100A1-3. Front disc =246 mm, rear disc =236 mm.

However, the unitrack discs look different in design/style to the B2 ones. Worth a closer look to see if the mountings are the same though.


And an expanded listing of compatable disc's for several models(I believe the "K" listings are for EBC brake systems part numbers)):

Kawasaki Brake Disc Sizes





BRAKE DISC ROTORS:



Brake disc: KD1
FRONT Z250A3 Z400J12/J3 Z440D/H Z550A2/A3 Z550C1/C2(LTD) Z550D1(GPZ) Z650F2/F3/F4 Z750R1(GPZ) Z750E/L/H GT750-SHAFT VN750A

Brake disc: KD2
FRONT EN450A EN500A/B GT550G-SHAFT Z1000J1/J2 Z1000K1/K2 GPZ1100B1 Z1100A1/A2/A3-SHAFT

Brake disc: KD3
FRONT Z1000J3 Z1000R2 GPZ1100B2

Brake disc: KD4
FRONT GPZ500S ER-5 ZX750G (GPZ750R) ZX750E1/E2 (TURBO) GPZ900R-A1-A6 GPZ1000RX ZL100A-ELIMINATOR ZX1100A1/A3 (GPZ)

Brake disc: KD5
FRONT ZX400C2 GPZ600R ZX750A1-A5(GPZ) GTR1000 A1-A7

Brake disc: KD6
FRONT KR1-S ZZR250 ZXR400H ZR550B-ZEPHYR ZL600B-ELIMINATOR ZX6R-F1-F4 ZZR600D/E ZR750C/D-ZEPHYR GPZ900R A7-A11 GTR1000 A9-A14 GPZ1100E/F

Brake disc: KD7
FRONT ZXR750H1/H2 ZR1100A/B-ZEPHYR ZRX1100C ZZR1100C1-C3

Brake disc: KD17
FRONT ZXR750J1/J2 K1 L1/L2/L3 M1/M2 ZX7-R P1/P2/P3/P4/P5/P6 ZX7-RR N1 ZX9R-B1/B2/B3 ZZR1100D1-D7

Brake disc: KD8
FRONT ZX10-ZX1000B 1988-1991

Brake disc: KD9
REAR ZX400C2 ZX550A1-A5(GPZ) ZX750A1-A5(GPZ) GPZ1000RX

Brake disc: KD10
REAR Z550D1 (GPZ) Z750R1 (GPZ) GT750P-SHAFT Z750E/H/L

Brake disc: KD11
REAR Z1000J1/J2/J3 Z1000K1/K2 Z1000R2 GPZ1100B1/B2 Z1100A1/A2/A3-SHAFT VN1500B2

Brake disc: KD12
REAR GPZ600R GPZ900R A7-A11 ZX10 B1-B3 ZZR1100C1-C3

Brake disc: KD13
REAR ZXR400H ZX-4 ZXR400L ZR550B-ZEPHYR ZZR600E GPX750R ZR750C/D ZEPHYR

Brake disc: KD14
REAR ZXR750H/J/K/L/M ZX7-R P1-P6 ZX7RR-N1 ZX9-R B1-B4

Brake disc: KD15
REAR ZZR1100D1-D7

Brake disc: KD16
REAR ZX750G (GPZ) ZX750E-TURBO GPZ900R A1-A6 ZL1000A-ELIMINATOR ZX1100A1/A2/A3 (GPZ)

OK, after much research I found out the 1983 GPz750 turbo model wsa the only GPz series with 280mm front brakes, actually 279.40mm. I guess that is the set I have.

So, we know the larger rotors fit on an early big GPz...are you running the stock brakes or did you have to upgrade to the later brakes?

No, the big GPz's had the same size rotors and used the same calipers as the GPz750's. I bought an 82 GPz750 about 7 years ago for an ELR clone project. The 750 had been raced back in the day and had safety wire all over it and a bunch of performance mods. Well I have finally gotten around to finishing the project and when I re-installed the front brake rotors which came on the bike my GPz1100 calipers did not fit. The caliper carriers were to short. I measured the rotors and found out they were 279.40mm. I measured the rotors from the 1100 and they measured 260mm. I figured the previous owner who raced this bike back int he 80's must have installed the 83 GPz750 turbo rotors and brakes for better braking. Probably one of those cheap upgrades back in the day. I figured since the rotors are larger they should work better than the smaller ones so I will use them.

I think you will find that the 1984/85 750 turbo and the 1983/84 gpz 1100 take the same rotors i have both and rotors are the same.

82 rotors ( 7 spoke rims ) have 7 rotor bolts. The 83 and up Uni-Track models with 3 spke wheels all use 6 rotor bolts. Therefore I highly doubt they are from a Uni-Track bike, cuz they do not interchange.

Although you will find that the 7 spoke REAR rotors are 280mm and have the same bolt pattern as fronts...you can bolt them onto the front wheel if memory serves correct. They are thicker than the fronts though.

Both my 1985 GPz900R and my 84 ZX750E1 Turbo use 280mm front rotors, WITH 6 bolts ( the drill pattern is diferent between these models but do interchange )