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Tire bead question

Somebody had a picture on here a few yrs back of cutting that surface flat for a tubeless valve stem. It really looks good & makes perfect sense. But never knowing about that tool, all the GS's I've had I just bolt the proper size tubeless valve stem in.

Like this tool...?

t4fgGMQ0UZi6XfSs6OUkJRLTuvv0R1dqTsXxenCzDCkT-R3v9uAnm8edCyqKQxrNEqX0n_YIM83Tk_VRLCECifIaA9C_6KEth4cGYlwUo1odOZDMaRVz_lM5PVgIwbHhAd5Pkx31UA=s800
 
Yup, that's the picture I'm remembering. That big fat washer on the valve stem squshes pretty good around the contour of the rim without the flat part cut in, but the flat sure would make it fit perfect.
 
My 1980 GS850GL had tubeless on the bike when I bought it. Replaced with the same. Have had no issues until I left it sit in my garage for several years and it did go flat and break the bead. Had to use a ratchet strap to get it to fill with air again.

The parts drawing do show a tube for mine.
 
The parts dia. at Suzuki Parts Monster shows the "80" GS850GL(T) had tubes in both F & R. The "81" GS850GL (X) has Tubeless on both F&R. ..
 
I fairly certain have the "T" model according to the way everything else looks.
 
The parts dia. at Suzuki Parts Monster shows the "80" GS850GL(T) had tubes in both F & R. The "81" GS850GL (X) has Tubeless on both F&R. ..

1980 and 1981 front wheels were the same PN.
 
For what it's worth, I converted my '82 1100E to tubeless and have not had any issues.

I haven't owned one, but I've done other work on at least three or four other examples of '82 and '83 GS1100E. None had tubes by the time I saw them, and none had any issues.
 
"80" & "81" front have same part # except color code at end, 80 grey, 81 black. All 850GL front wheel description says (N19xMT 1,85), even when part # changed for "82" & "83" the description stayed the same, all have the MT. "80" diagram shows an inner tube, part #17 on list says inner tube (3.50x19). The "81" diagram shows no inner tube and in the parts list there is no inner tube nor valve stem mentioned. After the part # changed in "82" none show an inner tube, but all show a valve stem... This all from Suzuki Parts Monster diagrams.
 
"80" & "81" front have same part # except color code at end, 80 grey, 81 black. All 850GL front wheel description says (N19xMT 1,85), even when part # changed for "82" & "83" the description stayed the same, all have the MT. "80" diagram shows an inner tube, part #17 on list says inner tube (3.50x19). The "81" diagram shows no inner tube and in the parts list there is no inner tube nor valve stem mentioned. After the part # changed in "82" none show an inner tube, but all show a valve stem... This all from Suzuki Parts Monster diagrams.

Interesting to note that the 80 and 81 OEM tyres listed in the parts diagrams for 850GL have different part numbers. 55100-45155 for the 80 (T) and 55100-45350 for the 81 (T).

It may be that the 80 bikes were delivered with a tube-type tyre and tube on early tubeless (MT) rims.
 
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