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 Post subject: XT thumbshifters ???
PostPosted: Tue May 23, 2006 9:57 am 
Old School Hero
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Joined: Thu Nov 10, 2005 4:52 pm
Posts: 175
Location: Eastbourne,East Sussex
Hi,why do XT thumbies have 7 clicks for 8 speeds ?.
Was this prior planning by the little men at the big "S" ?
Did someone put the extra click there by accident ?
Any ideas ?


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 Post subject:
PostPosted: Tue May 23, 2006 11:23 am 
retrobike rider
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Joined: Fri Oct 28, 2005 1:10 am
Posts: 4473
Location: Bristol
They weren't the outright market leader at the time and the market was very much of the old " mix 'n match " make-yer-own cassette ratios mentality. So, knowing folks might add a cog to their 7 speed cassette, they added the extra click to accomodate them.
Then they grabbed absolute global dominance and started shooting campag users in the street in cold blood.


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 Post subject:
PostPosted: Tue May 23, 2006 12:32 pm 
BoTM Winner
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Joined: Sun Oct 23, 2005 7:22 pm
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Location: Wooster, Ohio
There actually is not an 8th "click". The notched disk that makes up the shifting indents has a smooth area, indent, smooth area, indent, etc...

The space for the 8th "click" is the smooth portion of the disc between the indents for 7 and the stop before circling back to the first indent.

Not advanced analyzation of the market, just lucky coincidence.

cheers,

rody


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 Post subject:
PostPosted: Tue May 23, 2006 3:43 pm 
retrobike rider
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Location: Bristol
Err, we were talking about " 7 " clicks dude. If it had 8 clicks it would be 9 speed.

[ homer ] mmmmmmmmm 9 speed thumbies mmmmm [ / homer ]


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 Post subject:
PostPosted: Wed May 24, 2006 12:15 pm 
Dirt Disciple
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Joined: Thu Mar 09, 2006 10:06 am
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Location: The wight isle
Agency_Scum wrote:
Then they grabbed absolute global dominance and started shooting campag users in the street in cold blood.


I remember John Stevenson joking about the Campag sponsored riders using blacked-out XT mechs at the Worlds back in... Ooo... 1993ish.


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 Post subject:
PostPosted: Thu May 25, 2006 2:07 am 
BoTM Winner
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Location: Wooster, Ohio
Yo Agency_scum,

Better re-read my post...I agree, there is no "8th" click and stated that. In addition, I explained how that ghost click of the 7 speed system functions with an 8 speed drivetrain.

Everyone should take a 7 speed thumbie apart to see the indented disc that creates the indexed function. Helps in visualizing how travel at the shifter affects rear derailleur action.

cheers,

rody


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 Post subject:
PostPosted: Thu May 25, 2006 10:20 am 
retrobike rider
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Location: Bristol
Wish I could take a thumbie apart to see the indents. Trouble is I don't know how ( and save the thumbie as well ). It might explain why Dx ones are practically immortal and why I've gone through 3 pairs of pristine condition XT thumbs. Any idea? I thought maybe it was DX thumbs had steel plates with indents and XT had aluminium ( hence the extrordinary wear rate I've encountered ).


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 Post subject:
PostPosted: Thu May 25, 2006 10:49 am 
Dirt Disciple
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Joined: Thu Mar 09, 2006 10:06 am
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Location: The wight isle
My XTs have lasted fine... But to be fair, they don't get an awful lot of use now.


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 Post subject:
PostPosted: Sat Jun 10, 2006 5:31 pm 
Old School Hero
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Joined: Thu Nov 10, 2005 4:52 pm
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Location: Eastbourne,East Sussex
Hi,Rody mentioned taking XT thumbies apart.
Has anyone actully done this and if so how ?


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 Post subject:
PostPosted: Sat Jun 10, 2006 5:54 pm 
B.o.T.M. Winner / Feature Bike
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Joined: Tue Dec 13, 2005 3:26 pm
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Location: Tilting at windmills and shouting at the rain.
my mavic wishbones have about 15 clicks all spaced for a 7 speed cassette, so i was able to use an 8 speed cassette with a TNT 9th speed lockring cog (10 tooth) - now if I could find one of those original ritchey 34t cogs used to make up the old ritchey 9x2 kits then I could have a 10 speed cassette at 7 speed spacing!


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