Well, I guess I'll go ahead and show how stupid I am. I'm confused as to what size tires I need for my 1981 GS1000G. I don't understand the markings on my tires. Can somebody please tell me what I need, or at least where to look to find out? Thanks. 
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Current Bikes:
2001 Yamaha FZ1 (bought same one back) -
They should be marked on the sidewall. They'll look something like 100/90 19 (not those exact numbers, but in that format) -
Quick google search shows 110/90 19 in the front and 130/90 16 in the backComment
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BassCliff website says 3.50 x 19 front and 4.50 x 17 rear. This is pretty close to 90mm width for front and 120mm for rear. Most go slightly wider with a 100/90 x 19 and 130/90 x 17 since more tires are available in these sizes. Speed ratings are by letters, H is usually high enough, a lot of tires are rated higher at Z.Comment
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BassCliff has a chart on his site here:
But of course you'll have to convert to modern sizes. Shows a -17 rear, not a -16. The 1000GL would be a -16. Naturally one should confirm with the installed tires as the wheels could have been changed.Comment
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Yes, I saw the 3.50x19 on the front and 4.50x17 on the rear, but I had not seen that type of marking before. I was use to seeing the metric markings. ThanksCurrent Bikes:
2001 Yamaha FZ1 (bought same one back)Comment
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Just want to make sure those extra widths (110/90 front and 130/90 rear) will fit. Can anybody confirm? Thanks again.Current Bikes:
2001 Yamaha FZ1 (bought same one back)Comment
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Yes and Yes.
DanielComment
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Current Bikes:
2001 Yamaha FZ1 (bought same one back)Comment
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Went ahead and ordered Shinko 230 Tourmasters, both front and back. Estimated delivery in 2 days. Cool.Current Bikes:
2001 Yamaha FZ1 (bought same one back)Comment
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Suzuki was selling NOS tires for early 80s GSes at least as late as 1997. So the tire you removed might not have been the original one on the bike.
Can you check the date/factory code on the sidewall?Comment
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