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  1. #1
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    Default H-D rear dual flange hub question

    i bought a rear wheel this weekend at a swap meet for what i thought was a good deal.
    i thought it was a late 70s shovel or sporty.
    i spent about 2 hours reading my manuals & catalogs and another 2 hours looking around the internet before i decided to ask here.

    here's what i got.
    16" spoked wheel complete assy w/ sprocket & rotor.
    10" disk. 51t sprocket
    steel dual flange hub w/the C clip retainers to hold the bearings/seals('79-'83)
    it also had the axle adjusters for a square swingarm. of course those are for both sporty & shovel.
    i havent miced it yet but i did check it w/ a straight edge. the rim is centered on the hub(no offset)
    and the sprocket & rotor flanges are the same distance.
    i hope this is enough description.

    my question is are these wheels interchangeable between a sportster and a shovel of the same era?
    more directly are the hubs the same?
    as in should one side more offset on one side(the sprocket side).

  2. #2
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    I can't answer your questions directly, but I can say that although the Big Twin and XL rear disk brake hubs will not interchange directly, they'll interchange with the correct combination of spacers, and/or flat or dished sprockets. There are 2 or 3 different types of XL Ironhead/Evo rear hubs and the flange offset depends on whether they were used with a dished or flat sprocket. Hopefully, someone will have a definitive answer.

    Bob

  3. #3
    rokytnji
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    Yeah. What Bob said. I mix and match Mag rear wheels like that . But my stuff is oldy and not fuel injected or computerized. They sell dished or flat sprockets depending on what application you wanna use it on. Same for disc sizes. Need to know if you bought 1 inch or 3/4 inch axle holes and hubs accept timken instead of sealed bearings though.

  4. #4
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    Default

    i havent yanked it apart yet, but the axle is 3/4

  5. #5
    rokytnji
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    Quote Originally Posted by beat View Post
    i havent yanked it apart yet, but the axle is 3/4
    Sealed bearings. Evo wheel. Timken . Irohead wheel. Just a general description . Refer to your manual on what fits yours.

  6. #6
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    Quote Originally Posted by beat View Post
    i havent yanked it apart yet, but the axle is 3/4
    I'm assuming it's a steel hub? They're all 3/4" Timken style tapered roller bearings. Aluminum hubs are all sealed ball bearing and can be 3/4", 1" and 25mm bore sizes.

    Bob

  7. #7
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    Old thread, but here's some info that isn't in it. The 1979-1981 Sportster has more offset than the standard double flange hub to the brake side. This is because the caliper bracket uses the swingarm for an anchor, I guess. Here's a pic of the hub for a laced wheel. The 18" 9 spoke cast wheels used on '78 XLCR and some early '79 Sporties has the same offset. I'm not sure on the 16" cast wheel, whether the offset is cast into the wheel or a spacer is used.

    One more tidbit. If you come upon a double flanged hub that has 5/16" holes in the flanges and was probably chromed at one time, that's a front from an FXWG. The rears and FLH fronts have 7/16 holes in both flanges, even though the rotor bolts are 5/16" and 3/8".



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