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#11
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how many bearings does a single speed bike have?
On Sun, 30 Jul 2017 05:55:37 +0200, Emanuel Berg
wrote: Emanuel Berg wrote: rear hub 3 crank/BB 2 pedals 2 front wheel 2 fork + 2 ------ 11 rear hub: 3 big, 1 small I mean "2 big, 1 small". (You have to listen to what I think, not what I type.) But it is correct in the calculation so total remains 11. The Torpedo 3 SP has 3 bearings as well, 2 big, 1 small, but it also has a roller bearing. The Shimano 3 SP seems to have 2 big bearings, and 1 planet carrier, if that counts? The Shimano casette freewheel seems to have 2 small bearings. Given that the bearings you are counting are simply a bunch of balls maybe you need to get down to fundamentals and count the balls themselves. -- Cheers, John B. |
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#12
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how many bearings does a single speed bike have?
On Sun, 30 Jul 2017 05:57:46 +0200, Emanuel Berg
wrote: John B. wrote: Well, except for a "fixie" :-) Indeed. Does this (number of bearings) ever change save for the rear hub? https://www.youtube.com/watch?v=jmsWmx2wCyQ If it doesn't, it would seem it is yet another sign that the bike hasn't changed that much thru the ages. -- Cheers, John B. |
#13
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how many bearings does a single speed bike have?
John B. wrote:
Given that the bearings you are counting are simply a bunch of balls maybe you need to get down to fundamentals and count the balls themselves. Great idea! Only... with the exception of the branded rear hubs, do the balls really occur with any regularity from bike to bike? I know that in the front wheel hub sometimes the balls run loose and sometimes they are in a retainer. -- underground experts united http://user.it.uu.se/~embe8573 |
#14
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how many bearings does a single speed bike have?
On 7/29/2017 10:55 PM, Emanuel Berg wrote:
Emanuel Berg wrote: rear hub 3 crank/BB 2 pedals 2 front wheel 2 fork + 2 ------ 11 rear hub: 3 big, 1 small I mean "2 big, 1 small". (You have to listen to what I think, not what I type.) But it is correct in the calculation so total remains 11. The Torpedo 3 SP has 3 bearings as well, 2 big, 1 small, but it also has a roller bearing. The Shimano 3 SP seems to have 2 big bearings, and 1 planet carrier, if that counts? The Shimano casette freewheel seems to have 2 small bearings. There are no roller bearings in the F&S Torpedo Dreigang gearbox. http://www.scheunenfun.de/images/nab...ohnebremse.pdf -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#15
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how many bearings does a single speed bike have?
On Saturday, July 29, 2017 at 9:01:10 PM UTC-4, Emanuel Berg wrote:
rear hub 3 crank/BB 2 pedals 2 front wheel 2 fork + 2 ------ 11 rear hub: 3 big, 1 small -- underground experts united http://user.it.uu.se/~embe8573 You forgot the headset. Cheers |
#16
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how many bearings does a single speed bike have?
On 7/30/2017 3:45 AM, John B. wrote:
On Sun, 30 Jul 2017 06:17:05 +0200, Emanuel Berg wrote: Frank Krygowski wrote: Doesn't it have two pedals? Yes, that's what it says: Pedals - 2 OK, now it should be correct: rear hub 3 crank/BB 2 pedals 2*2=4 front wheel 2 fork + 2 ------ 13 Hey, maybe bikes aren't that simple after all? Buy the cheaper pedals that have no bearings at all and you are down to 9 bearings. Well, a "plain bearing" is still a bearing, and a pedal does have two bearings of one sort or another. One is at the crank side, one is at the outside. I suppose it's marginally possible to have only one deep groove ball bearing at the axle side. The pedal would be loaded as a cantilever beam, and you'd be hoping that the deep groove would resist the bending moment. But I don't know of any that are done that way. -- - Frank Krygowski |
#17
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how many bearings does a single speed bike have?
On 7/30/2017 12:04 PM, Frank Krygowski wrote:
On 7/30/2017 3:45 AM, John B. wrote: On Sun, 30 Jul 2017 06:17:05 +0200, Emanuel Berg wrote: Frank Krygowski wrote: Doesn't it have two pedals? Yes, that's what it says: Pedals - 2 OK, now it should be correct: rear hub 3 crank/BB 2 pedals 2*2=4 front wheel 2 fork + 2 ------ 13 Hey, maybe bikes aren't that simple after all? Buy the cheaper pedals that have no bearings at all and you are down to 9 bearings. Well, a "plain bearing" is still a bearing, and a pedal does have two bearings of one sort or another. One is at the crank side, one is at the outside. I suppose it's marginally possible to have only one deep groove ball bearing at the axle side. The pedal would be loaded as a cantilever beam, and you'd be hoping that the deep groove would resist the bending moment. But I don't know of any that are done that way. Sure you do: http://www.yellowjersey.org/SH83D.JPG http://www.classicrendezvous.com/USA...i_E_pedals.htm p.s. a nylon block pedal spinning on a steel shaft is one simple sleeve bearing. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#18
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how many bearings does a single speed bike have?
On 7/30/2017 1:09 PM, AMuzi wrote:
On 7/30/2017 12:04 PM, Frank Krygowski wrote: On 7/30/2017 3:45 AM, John B. wrote: On Sun, 30 Jul 2017 06:17:05 +0200, Emanuel Berg wrote: Frank Krygowski wrote: Doesn't it have two pedals? Yes, that's what it says: Pedals - 2 OK, now it should be correct: rear hub 3 crank/BB 2 pedals 2*2=4 front wheel 2 fork + 2 ------ 13 Hey, maybe bikes aren't that simple after all? Buy the cheaper pedals that have no bearings at all and you are down to 9 bearings. Well, a "plain bearing" is still a bearing, and a pedal does have two bearings of one sort or another. One is at the crank side, one is at the outside. I suppose it's marginally possible to have only one deep groove ball bearing at the axle side. The pedal would be loaded as a cantilever beam, and you'd be hoping that the deep groove would resist the bending moment. But I don't know of any that are done that way. Sure you do: http://www.yellowjersey.org/SH83D.JPG http://www.classicrendezvous.com/USA...i_E_pedals.htm Although I once had a little-ridden recumbent trike with Shimano AX pedals, I never dug into the oddball pedals. I knew they were cantilevered, but I sort of assumed they used two single row bearings side by side. (I didn't remember the Hi-E pedals at all.) p.s. a nylon block pedal spinning on a steel shaft is one simple sleeve bearing. Do they have just a plain cylindrical bore? I'd have thought they'd be molded so contact occurred only at the inboard and outboard ends of the pedal spindle. Obviously, I've never cut one apart. -- - Frank Krygowski |
#19
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how many bearings does a single speed bike have?
AMuzi wrote:
p.s. a nylon block pedal spinning on a steel shaft is one simple sleeve bearing. There are one-bearing pedals, no doubt. I don't know what is more common on "my" 70s and 80s bikes because altho I've picked apart a couple of pedals for fun, whenever there is a problem I just buy a couple of new and throw the old pair away. -- underground experts united http://user.it.uu.se/~embe8573 |
#20
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how many bearings does a single speed bike have?
Sir Ridesalot wrote:
You forgot the headset. It is included in the "fork" line. "Head tube" would perhaps be better... -- underground experts united http://user.it.uu.se/~embe8573 |
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