Are Hollowtech II cranks tricky to adjust?
I've watched a few videos on installing Hollowtech II, Octalink and square taper cranks. Do you find Hollowtech II tricky to work with? I mean, you can't put too much torque on the crank bolts but they can't be too loose either?
By the way, the BB30 standard looks like a pain to work with. But, there are several manufacturers for square taper bottom brackets. Seems like the easiest standard to me. |
Hollowtech II is very easy to work with. The pinch bolts that hold the nds arm are just alternately tightened to about 100 inch-pounds with a 5 mm hex key. That's pretty tight and about as tight as you are likely to get them with a standard L-wrench.
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a plastic cap does the side preload.. do buy the tool ... the 2 bolts in the crank arm hold the adjustment,
So in that... somewhat like your threadless headset.. you read the service manual ? |
Originally Posted by hybridbkrdr
(Post 20980150)
I've watched a few videos on installing Hollowtech II, Octalink and square taper cranks. Do you find Hollowtech II tricky to work with? I mean, you can't put too much torque on the crank bolts but they can't be too loose either?
By the way, the BB30 standard looks like a pain to work with. But, there are several manufacturers for square taper bottom brackets. Seems like the easiest standard to me. It is when you don't follow directions that hilarity starts happening in addition to breaking things. |
I just get it on enough to make sure the locking plate goes in. then crank down the bolts
https://www.performancebike.com/shim...QaAqxQEALw_wcB |
Handy site: https://www.bikeride.com/torque-specifications/
Proper torque and sequence are important. I know of at least two instances of the left arm coming off, |
Agreed that tapered square is the most versatile, and good enough for my generation's cycling gods (Merckz, LeMond). Andy
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Originally Posted by hybridbkrdr
(Post 20980150)
I've watched a few videos on installing Hollowtech II, Octalink and square taper cranks. Do you find Hollowtech II tricky to work with? I mean, you can't put too much torque on the crank bolts but they can't be too loose either?
By the way, the BB30 standard looks like a pain to work with. But, there are several manufacturers for square taper bottom brackets. Seems like the easiest standard to me. and if you are working with a half inch bit you have to tighten it as hard as you can by hand. done. thats it. |
Maybe I should have been a bit more specific. One of the things I saw in the youtube videos was someone saying if you have the cranks too tight, it will ruin the bearings. If you have it too loose, that's not good either. So, would you find it easier if Shimano designed a system where the cranks click once they're in the proper place?
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Originally Posted by hybridbkrdr
(Post 20985349)
Maybe I should have been a bit more specific. One of the things I saw in the youtube videos was someone saying if you have the cranks too tight, it will ruin the bearings. If you have it too loose, that's not good either. So, would you find it easier if Shimano designed a system where the cranks click once they're in the proper place?
Installation instructions are at https://si.shimano.com/pdfs/dm/DM-RAFC001-03-ENG.pdf. See page 17. The TL-FC16 tool comes with the cranks. https://cimg9.ibsrv.net/gimg/bikefor...c511eae6be.jpg
Originally Posted by hybridbkrdr
(Post 20980150)
By the way, the BB30 standard looks like a pain to work with. But, there are several manufacturers for square taper bottom brackets. Seems like the easiest standard to me.
Praxis Conversion for BB30/Shimano Wheels Mfg Thread Together for BB30/Shimano Enduro Torqtite for BB30/Shimano Shop around for price. -Tim- |
The tool used to preload the bottom bracket bearings is very difficult to overtighten. The pinch bolts holding the cranks in place should be tightened using a torque wrench. The proper way is to tighten the first bolt, then the other, then go back to the first and back to the other twice more to make sure that both pinch bolts are at the same torque. If you do that you will almost never have problems with an HTII crank
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Originally Posted by hybridbkrdr
(Post 20980150)
I've watched a few videos on installing Hollowtech II, Octalink and square taper cranks. Do you find Hollowtech II tricky to work with? I mean, you can't put too much torque on the crank bolts but they can't be too loose either?
By the way, the BB30 standard looks like a pain to work with. But, there are several manufacturers for square taper bottom brackets. Seems like the easiest standard to me. |
Originally Posted by alcjphil
(Post 20985408)
The tool used to preload the bottom bracket bearings is very difficult to overtighten. The pinch bolts holding the cranks in place should be tightened using a torque wrench. The proper way is to tighten the first bolt, then the other, then go back to the first and back to the other twice more to make sure that both pinch bolts are at the same torque. If you do that you will almost never have problems with an HTII crank
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Originally Posted by hybridbkrdr
(Post 20985349)
Maybe I should have been a bit more specific. One of the things I saw in the youtube videos was someone saying if you have the cranks too tight, it will ruin the bearings. If you have it too loose, that's not good either. So, would you find it easier if Shimano designed a system where the cranks click once they're in the proper place?
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Do any of you think T47 bottom bracket will be the way to go?
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I have a Shimano RS-500 crankset. The website for the bike says it has a PF30 bottom bracket. Frequently, especially if I'm pedalling hard, I start to hear a clicking sound in rhythm with every revolution of the crank. If I get off the bike and try to spin the cranks backward, it's slightly too tight, doesn't spin freely. If I loosen pinch bolts and back off the preload cap a little, then tighten the pinch bolts back down, the crank will spin freely, and the noise will disappear. But after 2-3 short rides the BB bearing is too tight again. What am I doing wrong?
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I would point out that some of the torque values above are different than what is in the Shimano Dealer's manual:
https://si.shimano.com/pdfs/dm/DM-FC0002-12-ENG.pdf Use instructions to properly install your BB. To preload the bearings, Timothy had it right: Snug up the NDS arm using the tool and your fingers. Then push down the (useless, IMHO) little plastic thingie, and then tighten the crank arm crank bolts to 12-14 Nm. As suggested above, you do this by alternately tightening each of the two opposing crank arm bolts in turn, working up to 12-14 Nm. I believe that this is 106 to 124 inch pounds. |
Originally Posted by FML123
(Post 21014907)
I have a Shimano RS-500 crankset. The website for the bike says it has a PF30 bottom bracket. Frequently, especially if I'm pedalling hard, I start to hear a clicking sound in rhythm with every revolution of the crank. If I get off the bike and try to spin the cranks backward, it's slightly too tight, doesn't spin freely. If I loosen pinch bolts and back off the preload cap, then tighten the pinch bolt back down, the crank will spin freely, and the noise will disappear. But after 2-3 short rides the BB bearing is too tight again. What am I doing wrong?
Doing all these things SHOULD keep your crank arm from loosening, but you may wish to try threadlocker (use medium, or blue, and definitely not permanent, or red) on the crank arm bolts. If you've gone through a lot of cycles of your bolts loosening, you may have significant wear on the arm. Have a look, or have your LBS take a look. |
Originally Posted by WizardOfBoz
(Post 21015370)
When you say "bolt", singular, I wonder are there two pinch bolts on the crank arm? Do you gradually tighten them both by alternating? Do you use a torque wrench?
Doing all these things SHOULD keep your crank arm from loosening, but you may wish to try threadlocker (use medium, or blue, and definitely not permanent, or red) on the crank arm bolts. If you've gone through a lot of cycles of your bolts loosening, you may have significant wear on the arm. Have a look, or have your LBS take a look. |
I know this sounds slightly off-topic but does anyone know if the problem described by FML123 would be solved by using the T47 bottom bracket? Would it be better to use internal or external bearings? (I think T47 is available for both.)
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Originally Posted by FML123
(Post 21014907)
I have a Shimano RS-500 crankset. The website for the bike says it has a PF30 bottom bracket. Frequently, especially if I'm pedalling hard, I start to hear a clicking sound in rhythm with every revolution of the crank. If I get off the bike and try to spin the cranks backward, it's slightly too tight, doesn't spin freely. If I loosen pinch bolts and back off the preload cap, then tighten the pinch bolts back down, the crank will spin freely, and the noise will disappear. But after 2-3 short rides the BB bearing is too tight again. What am I doing wrong?
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My suspicion was that the crank arm was coming loose and somehow your pedaling would tighten it up. Aeroguts idea is intriguing, as I suppose the theory is that the bearings themselves were working outward and tightening things up.
The only other possiblity I can think of offhand is if the BB30 housing in the frame is somehow bent or misaligned. The FSA video below is a bit over the top but does show how you could test the BB part of the frame before installing bearings. |
Hollowtech II is just fine by me not really had any issues so far. They are pretty easy to work with and you don't need a crank puller which is nice though you probably will want a cap tool which aren't expensive and certainly a torque wrench which you would want anyway for normal bicycle maintenance.
As far as T47 I do like the idea and hope it sticks around a while! I probably won't buy anything T47 for some time but I currently don't feel the need for it but maybe if I was a stronger rider I might see the need. Standard BSA threading has not been a problem. |
Originally Posted by hybridbkrdr
(Post 21015674)
I know this sounds slightly off-topic but does anyone know if the problem described by FML123 would be solved by using the T47 bottom bracket? Would it be better to use internal or external bearings? (I think T47 is available for both.)
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Originally Posted by AeroGut
(Post 21015839)
Is it at all possible that your bottom bracket was not pressed in properly and is working its way out? Look closely where it meets the frame and make sure it’s still pressed completely in.
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