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  • This topic has 6 replies, 3 voices, and was last updated 2 years ago by OBW.
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    • #15264
      OBW
      Participant

      Allo! I’m trying to determine the size of the axle nut on my GF’s GT250R, as I’m going to surprise her with a full set of new tools. Along with ratchets & sockets for 1/4, and 3/8 , there is a  set of 1/2 inch drive sockets and rachet, and breaker bar, but I think the largest is 22mm, and I’m sure the axle nut is bigger. I looked around here, and all over the net, but couldn’t find that info. She won’t need a whole set of huge sockets, so if I knew the size, I could augment the set, by just buying the one. Thank you!

    • #15265
      ♠️ M77
      Keymaster

      23mm is the size for the nut :- )

    • #15283
      OBW
      Participant

      Just lost the long reply I was typing. Anyway, huge thanks, and a suggestion, that maybe it would be helpful, to have a “sticky ” here, as a reference, listing any fastener sizes outside of a very basic tool set. Especially useful if you are grabbing tools to go somewhere, to get a buddy’s bike on the road. I usually note these things on my bikes in the service manual, but she’s only had the bike a few months. TBH, until she bought it, I’d never heard of Hyosung, but it has won me  over completely, A perfect first bike, no terrible habits, honest handling, and easy to repair. I wish my first street bike had been half as good. Thanks again for the help, and the forum.

       

       

    • #15292
      Jim
      Participant

      Why they went with 23mm is a real mystery! I had every inch & metric tool you can think of. Except for that bastard sized 23mm! Now that I have a combo wrench that size I’ve also used it on my SYM for valve adjusts and oil screen cleaning.

    • #15326
      OBW
      Participant

      bastard sized 23mm!

       

      I agree. I am also a little surprised, that there is no safety or other retention for the axle nut. Ideally, It would have been nice to see a castellated nut/split-pin, but that requires drilling a hole through the axle shaft, so I might  drill a axle nut, and safety wire it. This is a longshot, but does anyone know the thread pitch for the axle nut, or where a castellated nut for the GT250R can be sourced?

    • #15335
      ♠️ M77
      Keymaster

      should be 15 x 1.5mm or 17 x 1.5mm  fine pitch but get a thread pitch tool to confirm , because 23mm is an odd spanner size  (usually 22mm one side and 24mm next step!)

    • #15368
      OBW
      Participant

      M16 1.5 RH Thread Pitch. At least, that’s what Mr. Sursely at whygostock.com told me, after emailing him. He also sent a link to a castellated nut they sell, (don’t know if posting links is ok here) for about a third the price of the factory part. It does not mention the OD of the nut. I hope it’s 23mm, so I didn’t find that socket for nothing. lol

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