Maximum tyre sizes for a spoked wheeled GS1000S

[gs58]

I have found some spoke wheel hubs that will fit my 1979 GS1000S and am about to get the rims laced on. I am undecided on the width rims to get as I wish to get the maximum possible size tyres fitted. I plan to keep with the 19-inch front and 18-inch rear sizes and will also keep the original steel swingarm.

Can anyone advise me what the maximum size tyres are that I can fit? The tyre size will define which size rims I will use. I am just doing this for looks. the bike will not be ridden hard, and I will keep the original wheels so that the bike can be restored to standard if ever I wish to.

[Rijko]

just fyi ... you may need a 5mm spacer for the rear brake rotor.
Or, IIRC if you use the spoke rear wheel with the spacer from the mag wheels it's fine.

[rphillips]

Rijko, I'm thinking the spoked hub needs the spacer for the spoked hub and cast needs spacer for cast wheel... like you, if I remember correctly.

[gs58]

Thanks for your responses. I am aware of the spacer but am unsure of the clearance between the tyre and the chain or the chain guard. The spoked rim can be offset fractionally to allow a wider tyre, but I'd prefer not to do this.