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Old 02-22-09, 02:04 PM   #1
roadie138
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Help geting 12-27 dura ace cassette in right order

I just took my 12-27 7800 dura ace cassette off to clean it not sure where the spacers go?Is there any way I can get get the gears turned upside down?Or put it on wrong when I go to put this back on my wheel? Is there a place that shows a diagram of this?

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Old 02-22-09, 02:09 PM   #2
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Shouldn't be that hard. The cogs won't go on backward due to the pattern of the splines. Most of the spacers are the same so just play with them until the spaces between the cogs look equal.
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Old 02-22-09, 02:23 PM   #3
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Thanks Grouch I will see if I can figure it out. Also when I tighten my cassette how do I know when its tight enough?
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Old 02-22-09, 02:31 PM   #4
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Thanks Grouch I will see if I can figure it out. Also when I tighten my cassette how do I know when its tight enough?
Lockrings have a 40nm spec, which to me is way higher than is ever necessary. Don't forget to grease the lockring before putting it on. Go for sensitive tight on the lockring. It isn't rocket science.
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Old 02-22-09, 02:43 PM   #5
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Ok Thanks operator is General Purpose White Lithium Grease OK?
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Old 02-22-09, 05:26 PM   #6
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My two cents here. Lithium grease probably would be fine for that but you only need a light smear. I will agree about finding the spacing is easy, just line them up with the biggest gear on the bottom and go from there. I've never taken apart the Dura Ace cassette but other cassettes use spacers between the teeth. Look at it and it's easy to figure out. If there are any indentations around the large hole in the middle, they go down, towards the largest gear. Then just build up like a pyramid.
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Old 02-22-09, 05:45 PM   #7
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Since there are indents on the lockring, it is not hard for someone who has not
tightened one before to get it 'tight' but still have a few thousands play in the
cogs. A torque fairly close to the suggested 40NM is advisable for that reason.
A friend put our new 11-28 cassette on a new wheel for our tandem and the
cogs rattled all day yesterday on the chipseal. You can google a conversion factor to inch #
or foot # of torque if you don't have a torque wrench and guesstimate by
looking at your lever arm and the weight applied.
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Old 02-22-09, 06:14 PM   #8
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Since there are indents on the lockring, it is not hard for someone who has not
tightened one before to get it 'tight' but still have a few thousands play in the
cogs. A torque fairly close to the suggested 40NM is advisable for that reason.
A friend put our new 11-28 cassette on a new wheel for our tandem and the
cogs rattled all day yesterday on the chipseal. You can google a conversion factor to inch #
or foot # of torque if you don't have a torque wrench and guesstimate by
looking at your lever arm and the weight applied.
That is possible, you'd have to be an idiot to leave it that loose. But I can see how that's possible.
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Old 02-22-09, 06:56 PM   #9
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OK THANKS guys everythings back together and it seems to work fine.But now I wonder if the cassette is tight enough.After reading other post not getting it tight enough can be a problem.I want to buy a torque wrench would this one work http://www.harborfreight.com/cpi/cta...Itemnumber=239 . Is there any way to convert nm to foot pounds?
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Old 02-22-09, 07:00 PM   #10
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One N-m = .738 lb-ft so 40 N-m is 29.5 lb-ft or 354 lb-in.
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Old 02-24-09, 04:27 PM   #11
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While it is possible to overtighten the lockring it is much more common to not tighten enough. Loose cogs can damage the freehub. Rattling is not the only consideration. If you have any doubt about how tight is "tight enough" in this application use a torque wrench.

Al
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Old 02-24-09, 06:30 PM   #12
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A schematic is on Shimano's website under tech support, tech documents.
http://techdocs.shimano.com/media/te...9830608753.pdf
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Old 02-24-09, 09:24 PM   #13
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Yea Al I agree when in doubt about how tight is "tight enough" in this application use a torque wrench.
Went to my LBS today the mechanic showed me how tight he gets them. He says he never uses a torque wrench.And told me he has never had anybody come back and tell him the cassette was loose in the 15 years he's been working on bikes.But it would still be nice to torque it to the manufacture spec.Thanks for the schematic DAN thats exactly what I was looking for.
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