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  1. #1
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    Default 33.4mm Spoolie Question

    I want to put a spool wheel on my ironhead w/ 33.4mm forks. The axle, as I understand it, is ~.6685 , pretty much 17mm (.6693). What are my options?

    1. Making the axle fit? Turning it down to 5/8s

    2. Finding bearings with the right OD with a 17mm ID.

    3. Finding a specific hub/bearings for my forks (unlikely)

    Tried searching for more info but thought i'd float the question out there.

  2. #2
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    Anyone have a second opinion on what I could to to fit up a spool wheel to my 33.4mm fork setup?

  3. #3

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    What did you wind up doing? Working on the same problem. I have a 3/4 axle, planning on shortening and rethreading but would love to know if there is a bearing solution. I was told by my bearing supplier impossible.

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    3/4 axle?

    we talking about the same thing here man? 33.4 mm fork axle?

    anyways heres a bearing that fits the bill , https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

    i used a tc bros spool wheel one of the cheapest best quality ones available.
    Last edited by FatChibs; 02-20-2019 at 9:49 PM.

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    Lowbrow sells a spool hub with 3/4" bearings. https://www.lowbrowcustoms.com/chopp...b-40-hole.html

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    Quote Originally Posted by Trucker233 View Post
    What did you wind up doing? Working on the same problem. I have a 3/4 axle, planning on shortening and rethreading but would love to know if there is a bearing solution. I was told by my bearing supplier impossible.
    Ya, impossible; if the 62304/17 bearing fits FatChibs' spool hub on a 33.4 front end, which has a 52mm OD and is 21mm wide, then for a 3/4" ID, look here:
    3/4"x52x21 Sealed Bearing...$12.95
    https://www.vxb.com/3-4-x52x21-Seale...-p/kit8712.htm

    What are the dimensions of the hub you have for your 3/4" axle?

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    Quote Originally Posted by FatChibs View Post
    I want to put a spool wheel on my ironhead w/ 33.4mm forks. The axle, as I understand it, is ~.6685 , pretty much 17mm (.6693). What are my options?

    1. Making the axle fit? Turning it down to 5/8s

    2. Finding bearings with the right OD with a 17mm ID.

    3. Finding a specific hub/bearings for my forks (unlikely)

    Tried searching for more info but thought i'd float the question out there.
    Here is what ive done, turn axle down to 5/8, trick here is that you need to make a spacer for the axle to slide into on the leg bottom, left side if your facing the bike, pretty easy to turn down out of brass in a lathe.

    second option is to buy a 17mm hub, they are around $200

    third option is to make a 3/4 OD with 5/8 or 17mm ID sleve that slides inside the hub but fits a 5/8 or 17mm axle, whichever size you use

  8. #8

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    Quote Originally Posted by FatChibs View Post
    I want to put a spool wheel on my ironhead w/ 33.4mm forks. The axle, as I understand it, is ~.6685 , pretty much 17mm (.6693). What are my options?

    1. Making the axle fit? Turning it down to 5/8s

    2. Finding bearings with the right OD with a 17mm ID.

    3. Finding a specific hub/bearings for my forks (unlikely)

    Tried searching for more info but thought i'd float the question out there.
    The answer for you is #2.

    Standard ball bearings typically have metric dimensions, like the ball bearings in the drum brake XL front hub (or rear hub for that matter).
    Figure out the OD of the bearing your hub uses, and find a bearing that fits both hub and axle.

    There are inch series ball bearings as well, an example being the inner primary ball bearing in four speed primaries.

    There are also specialty hybrid bearings that are metric OD, and inch ID. These were common for spools used on 3/4 axles, so common that Drag Specialties and other distributors sold them at one time.

    Long answer, but as T, above has already pointed out, the bearings are available for almost any combo.

    Jim

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    i know you guys are on top of things here but this post is near two years old, i swapped the bearings long ago.

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    Great, good to know what you did too; just helping the other guy who had a - similar, or same -problem; Trucker233.

  11. #11

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    Quote Originally Posted by FatChibs View Post
    i know you guys are on top of things here but this post is near two years old, i swapped the bearings long ago.
    You brought the subject up, but many others read the threads. That's the whole point. Sharing knowledge and experience will hopefully help several people, as well as solving your particular problem. It would have been good if you posted your solution to your own problem, along with bearing numbers, to aid others who are reading. Feedback is gold, in anything.

    Jim

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    not enough coffee this morning u right

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