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#1
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Shimano Hollowtech lateral play
On a ride today on my gravel bike that came with Shimano gears, I
noticed movement in the BB area when I rode in much higher than normal gears up a 10% grade. When I got home I investigated and found that I can move the BB axle approximately 1 millimetre laterally. Having just watched a video where a fellow removes the cranks and BB axle from a bike, I am left wondering what controls lateral play? Now having watched another video https://www.youtube.com/watch?v=W3-c8tS12Ko I wonder, do I have to buy some special shims and another special tool to adjust the bearing preload? (I've not had any prior experience with this Shimano BB, and a similar problem doesn't exist for me with Campagnolo UT BBs that also employ outboard bearings.) -- JS |
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#2
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Shimano Hollowtech lateral play
On Sat, 4 Jan 2020 12:27:22 +1100, James
wrote: On a ride today on my gravel bike that came with Shimano gears, I noticed movement in the BB area when I rode in much higher than normal gears up a 10% grade. When I got home I investigated and found that I can move the BB axle approximately 1 millimetre laterally. Having just watched a video where a fellow removes the cranks and BB axle from a bike, I am left wondering what controls lateral play? Now having watched another video https://www.youtube.com/watch?v=W3-c8tS12Ko I wonder, do I have to buy some special shims and another special tool to adjust the bearing preload? (I've not had any prior experience with this Shimano BB, and a similar problem doesn't exist for me with Campagnolo UT BBs that also employ outboard bearings.) If the BB is as shown in the youtube it originally came with different thickness spacers but the side play is taken out by R.H. pedal's location on the shaft. The video shows the use of some sort of special gizmo to set the pre load but shimano used to and maybe still do supply a sort of nut thingie to adjust the pre-load before tightening the mounting screws. see: https://bike.shimano.com/en-EU/produ.../SM-BBR60.html check dealer's manual. -- cheers, John B. |
#3
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Shimano Hollowtech lateral play
On Friday, January 3, 2020 at 5:27:35 PM UTC-8, James wrote:
On a ride today on my gravel bike that came with Shimano gears, I noticed movement in the BB area when I rode in much higher than normal gears up a 10% grade. When I got home I investigated and found that I can move the BB axle approximately 1 millimetre laterally. Having just watched a video where a fellow removes the cranks and BB axle from a bike, I am left wondering what controls lateral play? Now having watched another video https://www.youtube.com/watch?v=W3-c8tS12Ko I wonder, do I have to buy some special shims and another special tool to adjust the bearing preload? (I've not had any prior experience with this Shimano BB, and a similar problem doesn't exist for me with Campagnolo UT BBs that also employ outboard bearings.) You adjust preload by tighten the retaining cap ("fixing bolt"). Loosen the pinch bolts and tighten down the retaining cap. You can look up the torque setting, but I just do it by feel, avoiding end loading and binding the BB bearings. Lou just uses a full beer can as a counter weight, IIRC. If you tighten it down all the way, and there is still play -- then you need some shims, which are readily available. FYI, be diligent with the torque setting on the pinch bolts, and tighten them alternately. It is possible for them to (1) strip if over-tightened, and (2) come loose if under-tightened. How are the koalas doing? Any left? Save the koalas! -- Jay Beattie. |
#4
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Shimano Hollowtech lateral play
On Sat, 04 Jan 2020 08:58:49 +0700, John B.
wrote: On Sat, 4 Jan 2020 12:27:22 +1100, James wrote: On a ride today on my gravel bike that came with Shimano gears, I noticed movement in the BB area when I rode in much higher than normal gears up a 10% grade. When I got home I investigated and found that I can move the BB axle approximately 1 millimetre laterally. Having just watched a video where a fellow removes the cranks and BB axle from a bike, I am left wondering what controls lateral play? Now having watched another video https://www.youtube.com/watch?v=W3-c8tS12Ko I wonder, do I have to buy some special shims and another special tool to adjust the bearing preload? (I've not had any prior experience with this Shimano BB, and a similar problem doesn't exist for me with Campagnolo UT BBs that also employ outboard bearings.) If the BB is as shown in the youtube it originally came with different thickness spacers but the side play is taken out by R.H. pedal's location on the shaft. The video shows the use of some sort of special gizmo to set the pre load but shimano used to and maybe still do supply a sort of nut thingie to adjust the pre-load before tightening the mounting screws. see: https://bike.shimano.com/en-EU/produ.../SM-BBR60.html check dealer's manual. Sorry (I must have been sitting on the bike backwards) the preload is set on the #L.H.# pedal. -- cheers, John B. |
#5
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Shimano Hollowtech lateral play
On 4/1/20 1:05 pm, John B. wrote:
On Sat, 04 Jan 2020 08:58:49 +0700, John B. wrote: On Sat, 4 Jan 2020 12:27:22 +1100, James wrote: On a ride today on my gravel bike that came with Shimano gears, I noticed movement in the BB area when I rode in much higher than normal gears up a 10% grade. When I got home I investigated and found that I can move the BB axle approximately 1 millimetre laterally. Having just watched a video where a fellow removes the cranks and BB axle from a bike, I am left wondering what controls lateral play? Now having watched another video https://www.youtube.com/watch?v=W3-c8tS12Ko I wonder, do I have to buy some special shims and another special tool to adjust the bearing preload? (I've not had any prior experience with this Shimano BB, and a similar problem doesn't exist for me with Campagnolo UT BBs that also employ outboard bearings.) If the BB is as shown in the youtube it originally came with different thickness spacers but the side play is taken out by R.H. pedal's location on the shaft. The video shows the use of some sort of special gizmo to set the pre load but shimano used to and maybe still do supply a sort of nut thingie to adjust the pre-load before tightening the mounting screws. see: https://bike.shimano.com/en-EU/produ.../SM-BBR60.html check dealer's manual. Sorry (I must have been sitting on the bike backwards) the preload is set on the #L.H.# pedal. Ok. Looks like I need to play. -- JS |
#6
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Shimano Hollowtech lateral play
On 4/1/20 1:04 pm, jbeattie wrote:
On Friday, January 3, 2020 at 5:27:35 PM UTC-8, James wrote: On a ride today on my gravel bike that came with Shimano gears, I noticed movement in the BB area when I rode in much higher than normal gears up a 10% grade. When I got home I investigated and found that I can move the BB axle approximately 1 millimetre laterally. Having just watched a video where a fellow removes the cranks and BB axle from a bike, I am left wondering what controls lateral play? Now having watched another video https://www.youtube.com/watch?v=W3-c8tS12Ko I wonder, do I have to buy some special shims and another special tool to adjust the bearing preload? (I've not had any prior experience with this Shimano BB, and a similar problem doesn't exist for me with Campagnolo UT BBs that also employ outboard bearings.) You adjust preload by tighten the retaining cap ("fixing bolt"). Loosen the pinch bolts and tighten down the retaining cap. You can look up the torque setting, but I just do it by feel, avoiding end loading and binding the BB bearings. Lou just uses a full beer can as a counter weight, IIRC. If you tighten it down all the way, and there is still play -- then you need some shims, which are readily available. FYI, be diligent with the torque setting on the pinch bolts, and tighten them alternately. It is possible for them to (1) strip if over-tightened, and (2) come loose if under-tightened. Thanks. Yes I will be torquing to spec. How are the koalas doing? Any left? Save the koalas! I'm sure enough will have survived to continue the species, but food will be the next issue, seeing as how most of the trees where they inhabit are leafless now. https://www.statista.com/chart/20387/recent-wildfire-events-by-acreage-burned/ And it's still burning out of control, so the area burned will continue to grow. -- JS |
#7
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Shimano Hollowtech lateral play
On Friday, January 3, 2020 at 9:35:55 PM UTC-5, James wrote:
On 4/1/20 1:04 pm, jbeattie wrote: How are the koalas doing? Any left? Save the koalas! I'm sure enough will have survived to continue the species, but food will be the next issue, seeing as how most of the trees where they inhabit are leafless now. https://www.statista.com/chart/20387/recent-wildfire-events-by-acreage-burned/ And it's still burning out of control, so the area burned will continue to grow. Vaguely related, I recently read _1491_ by Charles Mann, about pre- Columbian North & South America. Among much other fascinating stuff, he pointed out that the American Indians of New England conducted annual burns of the forest underbrush, for various reasons - to aid hunting, to make travel easier, to promote growth of grass and attract prey. And I think it's now clear that too much undergrowth exacerbates fire risks. Which makes me wonder: Did the Australian aborigines have a tradition of conducting controlled burns? Did that practice end and lead to the current tragedy? Just wondering. - Frank Krygowski |
#8
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Shimano Hollowtech lateral play
On Saturday, January 4, 2020 at 3:04:21 AM UTC+1, jbeattie wrote:
On Friday, January 3, 2020 at 5:27:35 PM UTC-8, James wrote: On a ride today on my gravel bike that came with Shimano gears, I noticed movement in the BB area when I rode in much higher than normal gears up a 10% grade. When I got home I investigated and found that I can move the BB axle approximately 1 millimetre laterally. Having just watched a video where a fellow removes the cranks and BB axle from a bike, I am left wondering what controls lateral play? Now having watched another video https://www.youtube.com/watch?v=W3-c8tS12Ko I wonder, do I have to buy some special shims and another special tool to adjust the bearing preload? (I've not had any prior experience with this Shimano BB, and a similar problem doesn't exist for me with Campagnolo UT BBs that also employ outboard bearings.) You adjust preload by tighten the retaining cap ("fixing bolt"). Loosen the pinch bolts and tighten down the retaining cap. You can look up the torque setting, but I just do it by feel, avoiding end loading and binding the BB bearings. Lou just uses a full beer can as a counter weight, IIRC. If you tighten it down all the way, and there is still play -- then you need some shims, which are readily available. FYI, be diligent with the torque setting on the pinch bolts, and tighten them alternately. It is possible for them to (1) strip if over-tightened, and (2) come loose if under-tightened. How are the koalas doing? Any left? Save the koalas! -- Jay Beattie. +1. The preload cap should not be bottoming out on the axle but on the left crank arm. You can easily see this if you remove the preload cap (first loosen the pinch bolts). The axle should not be flush with the surface of the crank arm. I had a photo of it but I couldn't find it. Somewhere in my digital black hole. The torque spec is 2 Nm which is very low for a torque wrench hence my use of a filled 650 ml waterbottle as a counter weight. Make sure al threads are clean and lubed before torquing otherwise you just overcoming friction. Strange that you didn't notice this earlier. Lou |
#10
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Shimano Hollowtech lateral play
On Fri, 3 Jan 2020 20:06:00 -0800 (PST), Frank Krygowski
wrote: Did the Australian aborigines have a tradition of conducting controlled burns? Did that practice end and lead to the current tragedy? In some areas, invasive plants are a factor. The native kerosene grass flashes up and is gone; the invasive plants burn more slowly, set fire to other plants, and roast the soil. -- Joy Beeson joy beeson at comcast dot net |
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