Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9

Thread: Switching rims

  1. #1
    Senior Member
    Join Date
    Apr 2010
    Location
    New York City
    Posts
    725
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Switching rims

    Can I switch a double walled 622-15 rim with a 622-17 single walled rim without changing spokes?The spokes are new.Do I need different nipples?The 622-17 is the presently installed rim and the 622-15 would be an upgrade.Thanks!

  2. #2
    Senior Member
    Join Date
    Aug 2005
    Location
    Pittsburgh, PA
    My Bikes
    '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
    Posts
    26,180
    Mentioned
    14 Post(s)
    Tagged
    0 Thread(s)
    It's unlikely the spoke would be the correct length.

  3. #3
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,209
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    You need to compare the ERD of the two rims. This information is available at various sites for many rims.

  4. #4
    30 YR Wrench BikeWise1's Avatar
    Join Date
    Aug 2005
    Location
    Oxford, OH
    My Bikes
    Waterford R-33, Madone 6.5, Trek 520
    Posts
    2,003
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    +1. The fact this question is being asked is indicative of someone who probably isn't aware of the relationship between things like ERD and spoke length.

    If that's the case, the OP probably shouldn't be building own wheels just yet. But that's just the opinion of someone who builds lots of wheels.......for a living.......

    OP, this question cannot be answered without more information.

  5. #5
    Senior Member
    Join Date
    Apr 2010
    Location
    New York City
    Posts
    725
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by HillRider View Post
    It's unlikely the spoke would be the correct length.
    I'm going to assume this is the definitive answer.I thought perhaps the "622"would be the workable measure and therefore doable.I just purchased a truing wheel and tensionmeter and am determined to learn truing and eventually wheel building since I'm so dissatisfied with NYC mechanics.Of course I plan on practicing on some old wheels before I doit seriously on a working bike.

  6. #6
    Senior Member
    Join Date
    Mar 2008
    Posts
    4,389
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by trek330 View Post
    Can I switch a double walled 622-15 rim with a 622-17 single walled rim without changing spokes?
    Unlikely. 622 refers to the bead seat diameter, basically where the tire meets the rim. There's no fixed relation between the BSD and the requires spoke length. 15/17 refers to rim internal width, which has a so-so relationship to which width of tires you can run on a certain rim.

    The value you want to be looking for is (quote from Sheldon Brown) Effective Rim Diameter. This is the rim diameter measured at the nipple seats in the spoke holes, plus the thickness of the two nipple heads. The E.R.D. is needed for calculating the correct spoke length.

    A rim with a higher profile will have a lower ERD despite being the same BSD.

    Do note that all suppliers measure ERD in the same way, and don't take for granted that values listed on websites are correct.

    Sometimes picking another lace pattern can offer possibilities. Going from 3-cross double wall to 2-cross single wall might free up enough spoke length for a successful transplant. Or 3X single-wall to 4X double wall might use up enough spoke for the wheel to tension up properly.

    Different nipple lengths can, IME, be used for minor tweaks of spoke lengths. However, not all would agree, and for a first build you want things to line up nicely w/o any extra challenges.

  7. #7
    Senior Member
    Join Date
    Mar 2010
    Location
    City of Brotherly Love
    My Bikes
    Raleigh Companion, Nashbar Touring, Novara DiVano, Trek FX 7.1, Giant Upland
    Posts
    1,172
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I'm with HillRider. Since one of the rims is single walled and the other is double walled, it is extremely unlikely that they have the same ERD.

  8. #8
    Senior Member peripatetic's Avatar
    Join Date
    Oct 2004
    Location
    NYC
    My Bikes
    All 70s and 80s, only steel.
    Posts
    2,124
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

  9. #9
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    24,012
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by trek330 View Post
    Of course I plan on practicing on some old wheels before I doit seriously on a working bike.
    I hear that a lot but I think that it's a bad plan.

    You can practice the actual laceing function using an old wheel but I could train a chimpanzee to do that part.

    The real wheelbuilding process starts after the wheel has been laced. Getting all of the spokes to equal and even tension is what we're after. If you are practicing with an old wheel, the rim is likely to be egg shaped and out-of-true. I don't think that you can teach yourself to tension and true a wheel properly using a crappy rim. Since you've already spent money on tools, have the confidence to start with decent quality hub, rim and spokes. If you take your time and sweat the details there is no reason why your first wheel shouldn't rival the quality of anything that you can buy.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •