GS1100G Front Brake Calipers on an GS850G?

[RustyTank]

I'm in the process of talking with another member about purchasing a pair of front brake calipers from his 1982 GS1100G, as an upgrade to put onto my 1979 GS850G. I want to know if the calipers are a direct bolt on or would I also need to install the rotors from the 1100? He'd be selling me the master cylinder as well. Just want to know what I'm getting myself into here if I pull the trigger.

[hampshirehog]

They'll plug straight on.

Edit. Unless one bike is an L and the other isn't.

[RustyTank]

They'll plug straight on.

Edit. Unless one bike is an L and the other isn't.

Thanks for chiming in hampshire.

Nope, they're both G's.

[salty_monk]

Wally do you need the later rotors as well? That's the one thing I couldn't recall off hand.

I know the older rotors are a different (detached spider) design and both heavier and thicker at the hub....

[hampshirehog]

The calipers will work with both types of rotors (discs) but the later slotted type would be better.

[RustyTank]

The calipers will work with both types of rotors (discs) but the later slotted type would be better.

And the rotors are a direct bolt on, onto the 79 GS850G hub?

[hampshirehog]

And the rotors are a direct bolt on, onto the 79 GS850G hub?

Yes they are.

[RustyTank]

Yes they are.

Thanks very much for your help Wally. Really appreciate it.
Cheers.

[RustyTank]

Yes they are.

hampshire, can you please confirm for me that a later year rear wheel rotor is also a direct bolt on onto the 1979 GS850G? I'm currently looking at a rear wheel rotor off a 1980 GS850G on ebay.
Additionally, It's my understanding that the rear caliper didn't change much over the years on these bikes. My hope is that if a later year rotor IS in fact a direct bolt on that it won't affect the stock 79 rear caliper.

[hampshirehog]

Yes, the rear brakes, both callipers and rotors or discs as we call them are interchangeable.

[RustyTank]

Yes, the rear brakes, both callipers and rotors or discs as we call them are interchangeable.

Thanks very much.