Conference noted::bicycle

> What exactly is Hyperglide?

	I don't remember the exact details but it involves a new
	sprocket design that makes shifting smoother and more
	positive.  It involves, if I recall, alternating short
	and tall teeth.

    .1>>  ... makes shifting smoother and more positive. ...
    
    That's something of an understatement.  What you notice as a rider is
    that you can start climbing a hill in too high a gear, and then change your
    mind halfway up -- the shift works perfectly, even when you're cranking
    as hard as you can.                                            
    
    I've found it to be a really terrific innovation.
    
    /JEP

    The hyperglide cogs have cutouts that make down shifting under load
    a snap!  But watch that front wheel, or over you go!
    
    John_who_loves_Hyperglide

    Changing the subject slightly, I have heard that Shimano will
    introduce some new Hyperglide things in 1990.  Hyperglide for road
    bikes as well as a similar innovation for front chainrings.  I never
    thought that was a problem that needed a solution but we'll just have
    to see how much better it is.
    
    ed

    Hyperglide is a Shimano invention (patent? trademark?) that does
    what people have said in previous replies--it really makes shifting
    under load quite smooth.  
    
    If you look closely at the sides of the individual cogs in the rear
    cassette, you see shallow ridges or rills that are cut into them.
    These seem to have the effect of grabbing the side plates of the
    chain links and really making the chain jump onto the next larger
    sprocket.  
    
    I don't know why it wouldn't work on the front chainring--maybe
    they had to save that so they'd have something new to introduce
    for 1990!
    
    tom

	I just test road a Raleigh technica mountain bike with the 1990 version
of the hyperglide. The biggest thing I noticed was the redesign of the shift 
levers.  They're under the bar rather than above and have two levers each. 
You push one for upshift, second for downshift.  Very nice and easy to use.
And of course the hyperglide system makes it very smooth and positive.

        The perils of mail-order start biting. I have just received a
    cassette (which advertises itself as Hyperglie HG70) which doesn't fit
    my 7-speed Ultegra freehub. Having locked myself into Shitmano, I
    thought I was safe!!!
       The differences are that the freehub has a uniform set of splines,
    and is threaded at the end for a lockring. The cassette splines are
    uneven, one being wider than the others, and the locking cog is
    threaded on the outside, as if it's meant to screw into something
    rather than onto the hub.
       So, does anyone know what Shimano are playing at ? Have I been
    sold a mountain bike cassette (It's a 13-21, dammit!) ? Why on earth
    do the spline arrangements have to be different ?
    
    ---Alan

     Simply out, Japanese design stability and customer satisfaction
    (before revenue consideration).... :-)
    
     I'll take the stuff with the olive oil on it any day!!!
    
       Chip

You need to replace the whole rear hub to convert from SIS to Hyperglide.  The
casette splining is different between the two.  This is supposedly because the
Hyperglide casette has to be oriented differently than the SIS.

Mark

    yuh, right.
    
    ed

    It's nice of them to do the 2 incompatible systems at the same time as
    well. I had no idea Ultegra 7-speed wasn't "Hyperglide". There ya go!
    It looks like the Merlin will have to be C-Record Ergo now, if only
    to spite Shimano.
    
    ---Alan

    Well, they don't do them at the same time, they did them sequentially.
    In any case, as you ought to realise by now, Ultegra 7-speed Hyperglide
    is history. STI shifting takes it to 8-speed.
    
    And speaking of history, this is my understanding of Shimano's progress
    with Ultegra - very open to correction.
    
    
    1984   intro of 6-speed SIS600 (threaded top sprocket, 126mm width)
           600 renamed Ultegra, goes 7-speed (threaded top sprocket, 126mm) 
           Hyperglide introduced (lockring, 126mm)
    1992   STI introduced with 8-speed Hyperglide (130mm)
    
    You've been caught been steps 2 and 3, so you're well off the pace.
    
    
    Rod

    Of (vax) course (alpha) our (MIPS) company (VMS) would (Ultrix) 
    never (OSF/1) think (alphaVMS) of (DECeln) treating (DECelx) our
    (DECnet) customers (TCP/IP) that (XMI) way (TURBOchannel), (Q-bus)
    now (BI) would (Futurebus+) we (VME) !
    
    mark
    
    (was there a subliminal message in there?)