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Old 05-22-07, 06:24 AM   #1
DougG
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Torqueing cassette lock ring

I'll be installing a Shimano cassette on my new wheels, and I see that the Park instructions call for torqueing the lock ring to 40 Nm, which is ~30 lb-ft. Since they show you using an open-end wrench on the lock-ring tool, and it looks like it might be difficult to find a way to actually use a torque wrench, can I assume that you just need to reef this guy down pretty tight?
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Old 05-22-07, 06:36 AM   #2
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I go with "good and tight" and I've yet to have one come loose
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Old 05-22-07, 07:31 AM   #3
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If you want to use a torque wrench just get a socket that fits over the lock ring tool.
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Old 05-22-07, 07:59 AM   #4
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I go with "good and tight" and I've yet to have one come loose
+1. You do it enough times you'll know the feel.
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Old 05-22-07, 08:30 AM   #5
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I have a variety of torque wrenches at home that i use with regularity on my bike. However that's only because i use them with regularity on my car.
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Old 05-22-07, 09:22 AM   #6
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I think the Shimano lockring tool accepts a 3/8" socket drive. Or maybe I slipped a 25mm socket around the whole lockring tool and torqued it that way? Either way, I somehow got a torque wrench on that thing. But yeah "good and tight" works nicely too.
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Old 05-22-07, 09:40 AM   #7
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At my age 30 foot pounds seems like a lot of torque. In my younger days it would have been pretty moderate. However, I still appreciate "good and tight".

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Old 05-22-07, 12:09 PM   #8
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The Lifu tool takes a 1/2" drive. (I really like the guide pin on them too.) Not often sold under the Lifu name, but I recommend it. Nice long 1/2" drive wrench is easier to wield.
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Old 05-22-07, 01:29 PM   #9
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I use a torque wrench on my lockrings. I fouind if I didn't get them tight enough I would have shifting problems. If you tighten to tight you run the risk of stripping or stretching the threads.
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Old 07-30-07, 09:24 AM   #10
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I just installed my first HG cassette. I don't have a socket large enough for the tool so was not able to use my torque wrench yet; I just used a large crescent wrench and tightened it a few turns.

I didn't want to overtighten or strip it - is it normal to hear a lot of clicking as you tighten? and I 've not yet test ridden - will it loosen rapidly if I've not tightened it on sufficiently?

Finally I do plan on getting the socket to fit the lockring tool; just wanna make sure I didn't do anything wrong - those clicks were freaky sounding.....like the sound a ratchet driver makes.
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Old 07-30-07, 09:35 AM   #11
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The clicks are normal. It's Shimano's way of 'locking in' in the lockring. Even with a 1/2" torque wrench it's difficult to over-tighten these.
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Old 07-30-07, 09:43 AM   #12
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At my age 30 foot pounds seems like a lot of torque. In my younger days it would have been pretty moderate. However, I still appreciate "good and tight".
I think so too.
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Old 07-30-07, 10:14 AM   #13
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Quote:
Originally Posted by pgoat View Post
I just installed my first HG cassette. I don't have a socket large enough for the tool so was not able to use my torque wrench yet; I just used a large crescent wrench and tightened it a few turns.

I didn't want to overtighten or strip it - is it normal to hear a lot of clicking as you tighten? and I 've not yet test ridden - will it loosen rapidly if I've not tightened it on sufficiently?

Finally I do plan on getting the socket to fit the lockring tool; just wanna make sure I didn't do anything wrong - those clicks were freaky sounding.....like the sound a ratchet driver makes.
I got a cheap Sears sparkplug socket (1 inch size) to fit my Campagnolo cassette tool. It's deep enough to fit over the tool and the quick release nut. They have Craftsman and also a cheaper line of sockets, this one was around 3 or 4 dollars. I already had a 1/2 inch torque wrench for my car wheels.

I found out the hard way that the tool needs to be held in place by a quick release skewer. Mine pulled out and stripped some of the splines on the tool. It's actually hard to tell the clicks of the lockring apart from the torque wrench clicks. So I would apply pressure on the torque wrench, then back off the pressure and listen for the "back click" from the torque wrench.

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Old 07-30-07, 10:53 AM   #14
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thanks guys

I got the park tool with the guide pin but kinda wish i'd chosen the one with hollow all the way through and used with a QR.

I have to get the proper size socket (all my old spark pluggers were too small - tried em already) but good to know the clicking is normal.
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Old 07-30-07, 12:12 PM   #15
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I just installed my first HG cassette. I don't have a socket large enough for the tool so was not able to use my torque wrench yet; I just used a large crescent wrench and tightened it a few turns.

I didn't want to overtighten or strip it - is it normal to hear a lot of clicking as you tighten? and I 've not yet test ridden - will it loosen rapidly if I've not tightened it on sufficiently?

Finally I do plan on getting the socket to fit the lockring tool; just wanna make sure I didn't do anything wrong - those clicks were freaky sounding.....like the sound a ratchet driver makes.
It does sound scary - there are ratchet teeth on the lockring, to make sure it won't back off. So even if you under-torqued (unless you really wanted to), there's no way that thing is coming off on its own. First couple of times you put one on, it feels like you're really breaking something. But don't let that sound stop you from properly torquing it in, if not tight enough the cogs may not be fully seated, bringing associated shifting issues.
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Old 07-30-07, 12:23 PM   #16
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+1 on the lock ring tool with a pin. Agreed, do it a few times and you'll know where good and tight is. I have plenty of torque tools from back in the day when I was an auto mechanic, yet lockrings always go on by feel. It's pretty hard to mess up the install.
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Old 07-30-07, 11:15 PM   #17
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+1 on the lock ring tool with a pin. Agreed, do it a few times and you'll know where good and tight is. I have plenty of torque tools from back in the day when I was an auto mechanic, yet lockrings always go on by feel. It's pretty hard to mess up the install.
I've only installed one twice. The first time I went "good and tight", but it came off pretty easy when I removed it. So when I reinstalled it I stepped it up a notch to "pretty damn tight" but stopped short of "really tight".

I don't want to start a torque wrench vs. "feel" war, but I tend to agree with capwater. With the stop and go action when tightening a lockring, I'd trust my feel before a torque wrench, unless I really had no feel whatsoever for tightening threaded fasteners.
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Old 07-31-07, 12:22 AM   #18
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I've only installed one twice. The first time I went "good and tight", but it came off pretty easy when I removed it. So when I reinstalled it I stepped it up a notch to "pretty damn tight" but stopped short of "really tight".
Pretty subjective stuff. I'm not sure if Bobo the gorilla mechanic and my skrawny little niece can agree on "pretty damn tight".

Whenever someone tells me that their Campagnolo shifting is off and they just can't seem to get it right, I remove the rear wheel and check the lockring. I am amazed at how loose some of these are. I torque them down to spec, re-install the wheels, and lo and behold, the shifting problem has miraculously disappeared. This is more a Campagnolo thing than a Shimano thing, I will admit, but in this instance, a torque wrench is pretty useful. I'll tell you one thing. Every time I install a Campagnolo cassette, I marvel at just how tight they really are supposed to be.

I don't suggest that everyone immediately run out and buy themselves a torque wrench for the dozen or so times a year they will probably use it, but, if you already have one put it to good use here. it REALLY does make a difference in this application.
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Old 07-31-07, 06:17 AM   #19
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Whenever someone tells me that their Campagnolo shifting is off and they just can't seem to get it right, I remove the rear wheel and check the lockring. I am amazed at how loose some of these are. I torque them down to spec, re-install the wheels, and lo and behold, the shifting problem has miraculously disappeared. This is more a Campagnolo thing than a Shimano thing, I will admit, but in this instance, a torque wrench is pretty useful. I'll tell you one thing. Every time I install a Campagnolo cassette, I marvel at just how tight they really are supposed to be.
Interesting, but pretty accurate. I have never had anyone have a loose Shimano lockring, but the few I have encountered have been my Campy mates.
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Old 07-31-07, 08:04 AM   #20
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Interesting, but pretty accurate. I have never had anyone have a loose Shimano lockring, but the few I have encountered have been my Campy mates.
By loose I don't mean rattling around and about to fall of, I mean they feel like they were put on hand tight.
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Old 07-31-07, 09:59 AM   #21
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By loose I don't mean rattling around and about to fall off, I mean they feel like they were put on hand tight.
The other day on my commute I did my usual Good Samaritan stop when I saw this older gentleman walking his Bianchi. He told me that he couldn't pedal any more because the smallest cog had apparently broken off and jammed against the frame. He had never seen anything like it.

Me neither - so I bent down to take a look and sure enough, his Shimano lock ring (which I guess sort of looks like a teeny little cog) had come all the way off and had wedged itself so that the wheel could barely turn.

I didn't have my freewheel tool with me (an obvious oversight), so I put it on for him finger tight and told him where the nearest shop was. It must have been installed so loose that it never engaged the ratchets. Otherwise I can't explain how it could back all the way out like that...and to make it even weirder, he said he hadn't changed the cassette since he bought it new.

p.s. I think you're being paged, Mr. Dopolina. Mr. Bob Dopolina.

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Old 08-01-07, 08:19 PM   #22
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well, I got a 1" socket today and gave the cassette lockring an extra turn with the torque wrench - turns out I was at about 40 ft lbs (the Park tool website says 360 inch pounds - this means 30 ft. no?)

Is 40 ft lbs. too tight? did i mess up?

Oddly I never felt it getting 'tight' - it just went from smoothly spinning to that ratcheting sound. It seems tight enough on there.
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Old 08-02-07, 11:42 AM   #23
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Yes, 40 ft-lb (480 in-lb) is too tight. Max is 434 in-lb. Back it off and re-torque.

30 ft-lb isn't easy to get. I'm surprised that you got 40 without thinking that it's real tight. If possible try a different wrench. Yours may be out of whack.
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Old 08-02-07, 02:35 PM   #24
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hmm....I got it easily - and I'm a weakling!
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Old 08-03-07, 11:07 AM   #25
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30 ft-lb == 40 Nm

Sure you're reading the right scale?
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