Tire question...?

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  • coolio
    • Feb 2026

    #1

    Tire question...?

    Hi,

    I have two bikes that need tires.

    GS750 1977
    Will a 130/90-18 fit? Presently there is a 120/90-18 installed...which has a tube (spoke wheels)
    Can I purchase any type of rear tire and put a tube in it? What size tube? They where listed differently from the tire sizes on one site I was looking.

    GS750E 1983
    There's presently a 100/90-R16...what does the R stand for? I found a 100/90-16H...will this fit?

    Any info is appreciated.

    Cheers,

    Dave
  • Guest

    #2
    Originally posted by coolio
    Hi,

    I have two bikes that need tires.

    GS750 1977
    Will a 130/90-18 fit? Presently there is a 120/90-18 installed...which has a tube (spoke wheels)
    Can I purchase any type of rear tire and put a tube in it? What size tube? They where listed differently from the tire sizes on one site I was looking.

    GS750E 1983
    There's presently a 100/90-R16...what does the R stand for? I found a 100/90-16H...will this fit?

    Any info is appreciated.

    Cheers,

    Dave
    The R usually denotes a Radial and in rare case a speed rating, depends where the letter is placed in the sequence. In your case I would say Radial on this one, the H is a speed rating. H=130mph The 100/90-16H is a non radial or as the other denotes a radial. And yeah the 100/90-16H will fit though remember it isn't a radial.

    On the 77 750 you are pushing the width with a 130 on the rear. On my 1980 GS750E I installed a 5.10 (old time measurement to the new 130/90-18H) The 5.10 screwed with my handling big time. I went back to pretty much the stock size tires, cured the problem. The 120/90-18 is fine. The tube of the same size is what I would look for.

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    • coolio

      #3
      Originally posted by mrbill5491
      The R usually denotes a Radial and in rare case a speed rating, depends where the letter is placed in the sequence. In your case I would say Radial on this one, the H is a speed rating. H=130mph The 100/90-16H is a non radial or as the other denotes a radial. And yeah the 100/90-16H will fit though remember it isn't a radial.

      On the 77 750 you are pushing the width with a 130 on the rear. On my 1980 GS750E I installed a 5.10 (old time measurement to the new 130/90-18H) The 5.10 screwed with my handling big time. I went back to pretty much the stock size tires, cured the problem. The 120/90-18 is fine. The tube of the same size is what I would look for.
      Thanks for the info it's much appreciated...I'll stick with the stock 120 for the 77 and look for a radial (R16) for the 83.
      Dave

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