Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Senior Member
    Join Date
    Jun 2006
    Posts
    95
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Homebuilt tandem and 26" wheel question

    Hi all,
    I have a homebuilt road tandem using 26" wheels, and I wanted to replace the incredibly cheap set (from abandoned low-end MTBs) that I currently have on it. I see Performance has an inexpensive pair (http://www.performancebike.com/shop/...0#ReviewHeader) using Rhyno Lite rims and Deore M525 hubs. I've heard good things about the rims, but does anyone have experience with the hubs?

    Just for show, here's a shot of the tandem. (I know the stoker saddle is too low--we fixed it later. ) It has single-side drive with 40-tooth timing rings; the rear one is just bolted to the outside of the stoker crank, which is an MTB triple with the 48 tooth ring swapped for a 52. No eccentric BB or idler--I adjusted the chain tension with a half-link, and it seems pretty good as is. Shifting is by an old set of Campy (!) friction barcons. .

    Oh, and the most important detail: the frame. The front is an old Miyata MTB; the rear is a Trek 820. Additional tubes are 1.25", 0.9mm 4130, and the keel tube has two of them in parallel for extra stiffness. Overall design is direct lateral-ish--there's tube from the head tube to the captain's seat tube and another from the seat tube to just above the rear bottom bracket (I wasn't brave enough to try to miter it to intersect the keel tubes). I did the mitering on a Bridgeport using hole saws, clamped the thing up using aluminum bars with string for alignment, and took the whole mess off to a shop for TIG welding. The Miyata uses a 1" BMX headset, so it has a nice beefy head tube. Head tube angle is ~70-71 degrees, which gives the bike roughly 2.4-2.5" of trail. The stoker compartment is relatively generous--something like 29" if I remember correctly. I had it out on Saturday for 50 miles with a friend who's a strong cyclist, and it all worked out pretty well--handles nicely enough, no noticable frame flex, and we blew past a moped that decided to try and pass us. Total weight is in the vicinity of 42 lbs, which strikes me as pretty reasonable, given that I made no real attempt to save weight.

    Thanks,
    Daniel

    Last edited by dsmyers; 04-28-08 at 12:36 PM.

  2. #2
    pan y agua merlinextraligh's Avatar
    Join Date
    Aug 2005
    Location
    Jacksonville
    My Bikes
    Wilier Zero 7; Merlin Extralight; Co-Motion Robusta; Schwinn Paramount; Motobecane Phantom Cross; Cervelo P2; Motebecane Ti Fly 29er
    Posts
    27,217
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    very cool.

  3. #3
    Senior Member
    Join Date
    Jun 2007
    Location
    just east of Toronto, Ontario, Canada
    My Bikes
    1997 TREK 6500, 1998 KLEIN Mantra Race, 2004 KONA dew (SOLD),2006 SCOTT SUB (SOLD),2008 GIANT OCR (SOLD), 2006 TREK T900
    Posts
    83
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hey Daniel!
    that is something to be proud of. i'm sure the late Sheldon Brown is smiling while looking at your creation!
    have you beefed up the fork steer tube yet? i believe that is something that should be done right away.
    Rommel and Lucille

  4. #4
    Senior Member
    Join Date
    Jun 2006
    Posts
    95
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by the desert fox View Post
    Hey Daniel!
    that is something to be proud of. i'm sure the late Sheldon Brown is smiling while looking at your creation!
    have you beefed up the fork steer tube yet? i believe that is something that should be done right away.
    Thanks--those are kind words. I wish he could have seen it--it was because of his website that I started working on this, and I got a bunch of the parts from Harris.

    I have not reinforced the fork steerer tube--it's a pretty solid 1" MTB fork--but I might replace it with the 26" Long Haul Trucker fork (apparently you can kludge a 1.125 threadless fork to work with 1" BMX cups...the horror...).

    Daniel

  5. #5
    Senior Member Ti-tillIdie's Avatar
    Join Date
    May 2007
    Location
    Miami, FL
    My Bikes
    Litespeed Tuscany, 1991 Merlin Extralight, 08' Santana Tandem Sovereign, Co-Motion Espresso
    Posts
    242
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Very cool build! But it begs the question.... what will you call your bike? I think “Miya-Trek” sounds nice. But “Trek-Mi” sounds nice too.

  6. #6
    Senior Member zonatandem's Avatar
    Join Date
    Dec 2003
    Location
    Tucson, AZ
    My Bikes
    ariZona carbon fiber tandem & single
    Posts
    9,962
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Good lookin' tandem duo . . . and tandem!

Posting Permissions

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