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Conference noted::bicycle

Title: Bicycling
Notice:Bicycling for Fun
Moderator:JAMIN::WASSER
Created:Mon Apr 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3214
Total number of notes:31946

911.0. "Truing Stand" by COORS::T_DAWSON (Leave only footprints......) Tue Nov 01 1988 11:18

    I am going to be purchasin a truing stand and am looking for some
    info.
    
    Is the Minoura truing stand any good?
    
    Any other ideas?
    
    
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911.1Minoura not good for dishingUMBIKE::KLASMANTue Nov 01 1988 11:3926
< Note 911.0 by COORS::T_DAWSON "Leave only footprints......" >
                               -< Truing Stand >-

>    Is the Minoura truing stand any good?
    
For truing it ok, but if you want to dish your wheels on a stand, you'll need 
a better one.  The problem is that the truing calipers are just screws that 
you screw in and out to meet the rim and clear the tire and there's no way 
that I know of to accurately reset those screws to the same place.  Therefore, 
its impossible to flip the wheel (if you leave the tire on, inflated, and its 
too fat to clear the screws without moving them) to check dish.  While typing 
this, I just figured out how it could be done.  Mark the handle on the screws
(they're rather large) and always use the same number of revolutions (say 5) 
when you move the screws.  That will get you close, since it still will be 
difficult to stop in EXACTLY the same place in a revolution, and since the 
pitch of the screw is rather coarse, a small mistake in a revolution will 
translate into a large mistake in the distance the screw moves.  

Of course if you dish true and dish wheels with the tire off this isn't a
problem, but I think you should leave the tire on, since the tire exerts 
pressure on the wheel and could possibly affect the trueness of the wheel.

The Park stands (very costly) use calipers that move together, thus 
eliminating the above problem.  I'm thinking about getting one myself.

Kevin
911.2FRSBEE::D_LINNUSTue Nov 01 1988 12:0517
    
          I've recently bought a Park truing stand and find it to be
    of exceptional quality. There are two models that I know of, one
    sells for around 140. (performance prices - I think Nashbar is 
    slightly cheaper) and the other around 85. I bought the lesser 
    expensive one and was very impressed, the calipers for truing do
    move in sync, and where the axel rests for mounting has two adjustable
    hand-screws for centering with marked graduation lines for accuracy.
    The quality of material used to construct the unit is exceptional,
    heavy steel with a fine paint job, and it mounts very solidly to
    a work bench. This unit will help restore your faith in products
    made in the U.S. of A. I've bought other Park tools as well, work-
    stands, sockets, hex-wrenches etc., and find all of their products
    to be very impressive.
    
    Dave, who's_sold_on_Park_tools.
    
911.3You *can* dish with a Minoura truing stand!SMURF::BINDERAnd the quarterback is *toast*!Wed Nov 02 1988 16:4333
Re: .1, .2

First, I'm also sold on the quality of Park tools.  But that's never 
stopped me from doing an excellent job of dishing with my Minoura truing 
stand.  It's simplicity in spades.  

Once you have the wheel trued and *approximately* dished (which should
happen automatically as you round and true it, if you built it right)
all you need is *one* side of the screw "caliper" for dishing.  You do
the job by flipping the wheel a couple of times, backing either or both
screws off slightly until you can just set the wheel in the stand either
way.  One screw will touch - when you flip the wheel, the other screw 
touches.  Choose the easier-to-use side, and back the other screw off
farther to get it out of the way.  (I generally work on the right side, 
backing the left screw away.)

Take note of how far the screw is from the rim.  If it's 1/4 inch (6.4
mm) away, then your rim is 1/8 inch (3.2 mm) off center.  Tighten the
spokes on the side *toward* the screw you're using.  (A full turn can
move the rim as much as 1/4 inch (6.4 mm), so don't go overboard.)  This
action should pull the rim toward the screw.  Once you've moved it
something just *under* halfway, flip the wheel.  Move the screw in
toward the rim, and true again using just the one screw.  You're not
after perfect trueness yet. 

Flip the wheel again.  Note how far away from the rim the screw is, and 
you're off and running again.  Keep this up until the wheel is dished.
Do a final truing touchup.  Stress and re-touch.  Ride.

This method gets my wheels accurate enough that they are less than 1/100 
inch (.25 mm) off center.

- Dick
911.4I flip mine; flip yours, too!SUSHI::KMACDONALDloose chips sink mipsWed Nov 02 1988 20:4416
RE: truing by flipping...

I've always done it more or less this way, too. When I get to the point 
of seeing the screw 1/4" away from the rim, I then move the screw in 
about 1/8" of an inch (anyway, about halfway) and true the wheel right 
up to the screw. Another iteration or two and you've got a great lookin' 
wheel.

Our shop got a Park (type?) stand as an "upgrade", but after a brief trial we 
all sorta gave up on it as being tedious and inaccurate compared to what 
we were used to. Your mileage, of course, may vary! One problem with that 
variety of stand is that if the calipers or arm aren't perfectly aligned 
(or get bent a bit, or...) you'll never build another properly dished 
wheel on that stand (although you CAN if you do the wheel-flip routine!)

                                       ken