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wheelbuilding question

  • 06-01-2014 10:42pm
    #1
    Lawr
    Closed Accounts Posts: 157 ✭✭


    This question is addressed to people who have experience building wheels. I am considering a number of hubs for a set of wheels I am planning. I already have my rims (20h fr/24h rear). My questions relates to straight-pull spokes/hubs. I've been told by a local shop owner that he sees a lot of straight-pull spokes being pulled through the hub retainers (effectively, breaking the hub). I am not sure what causes this. I am unfamiliar with the head of the nail, so to speak, and how it is shaped, whether the spoke, in twisting in place, is wearing through the retainer or whether users are over-tightening spokes, pulling the spoke-head through the retainers or what is going on, but it occurred to me that it could be that these straight pulls, because they are mostly radially arranged, do need more maintenance (regular tension checks).

    Are there any Boards users who have experience with straight-pull spokes/hubs, and have they had any problems? Has any Boards members ever had a straight-pull spoke pop out of the hub? If so, could they speculate on the cause? I would appreciate any feedback. I find it difficult to imagine why a spoke would pull through unless there was a bad design to begin with or there was an action on the part of the cyclists/mechanic that exceeded some tolerance. Any information gratefully received.


Comments

  • #2
    Seweryn
    Registered Users, Registered Users 2 Posts: 4,499 ✭✭✭Seweryn


    A couple of things to consider:

    - Some hubs are not designed for radial lacing. You need to check that before you order the hubs.
    - Proper spoke tension is important.
    - Ask your wheel builder to use brass washers for spokes. They soften down the tension at the hub holes, especially when there is a bit of free play between the spoke head and the hub hole.


  • #3
    Lawr
    Closed Accounts Posts: 157 ✭✭Lawr


    Seweryn wrote: »
    A couple of things to consider:

    - Some hubs are not designed for radial lacing. You need to check that before you order the hubs.
    - Proper spoke tension is important.
    - Ask your wheel builder to use brass washers for spokes. They soften down the tension at the hub holes, especially when there is a bit of free play between the spoke head and the hub hole.

    Thank you, Seweryn. I am the wheel builder. I don't see any need for brass washers in this case. The hubs I am considering require radial lacing on the front and on the nds rear. That is why I am asking for any information that wheel builders might have about the vulnerability of straight-spoke hubs. The argument goes that straight spokes do not experience the stresses of elbowed spokes at the hub flange. However, I am getting anecdotal information, albeit from experienced bike mechanics, that there are vulnerabilities in the (I don't know what to call a flange that is not a flange--the spoke retainer) on a straight-spoked hub.

    Has anyone read any reviews that speak to this issue? Or read any other kinds of studies?


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