Correct tire size - '80 GS850L

[Dr. Woo]

Just bought the bike; first night on the forum. If someone can point me to front tire size clarification for '80 GS850L. Specs say 3.5, which equates I believe to a 90/90-19, but I swore I saw a thread here that said 100/90-19 was the correct size.

Which way, folks - Thanks

[Nessism]

Use the 100. 90 is too skinny

[bwringer]

Agreed. 100/90-19 up front.

I think in 1980 the GL used a 17" rear, so you want a 130/90-17 out back.

Later GL models used a 16" rear, 130/90-16.

[phydeauxmutt]

Correct on all accounts.

Further clarification: yes, the 90/90 is the "more-correct" translation of the original size, but the 100/90 works very well and it also minimizes the usual speedometer error.

[Dr. Woo]

Outstanding! Thanks gentlemen.