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#11
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No bearing = no bearing problems
On Thursday, September 5, 2019 at 10:13:49 PM UTC-7, Chalo wrote:
Tom Kunich wrote: Chalo, What do you call those crank standards that fit the press-in bearings BBs? They are narrower than the 386. There are too many Johnny-come-lately nonstandard BB standards to keep track of them all. When I run across one I can't identify (rarely, because my shop is mostly commuters and thrifty upcyclers), I consult a table like Park Tool's. My last mystery solved was a State brand disc brake CX bike with an eccentric BB. When I pulled the thing out, I thought, "this doesn't look quite big enough to be a tandem eccentric shell" and also "f**k me-- a new superfluous GD BB standard". Turns out it was a regular BMX/OPC type shell with a couple of big set screws welded on. That customer got a tubular CrMo crank which was cheaper and cooler than what had been in the original plan. I picked up an FSA crank and it was too narrow for my 386 cups. Eventually I used the rings off of it. |
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#12
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No bearing = no bearing problems
On Friday, September 6, 2019 at 8:01:52 AM UTC-7, Tom Kunich wrote:
On Thursday, September 5, 2019 at 10:13:49 PM UTC-7, Chalo wrote: Tom Kunich wrote: Chalo, What do you call those crank standards that fit the press-in bearings BBs? They are narrower than the 386. There are too many Johnny-come-lately nonstandard BB standards to keep track of them all. When I run across one I can't identify (rarely, because my shop is mostly commuters and thrifty upcyclers), I consult a table like Park Tool's. My last mystery solved was a State brand disc brake CX bike with an eccentric BB. When I pulled the thing out, I thought, "this doesn't look quite big enough to be a tandem eccentric shell" and also "f**k me-- a new superfluous GD BB standard". Turns out it was a regular BMX/OPC type shell with a couple of big set screws welded on. That customer got a tubular CrMo crank which was cheaper and cooler than what had been in the original plan. I picked up an FSA crank and it was too narrow for my 386 cups. Eventually I used the rings off of it. That's why you buy a 386 crank for 386 threaded BB. -- Jay Beattie. |
#13
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No bearing = no bearing problems
On Friday, September 6, 2019 at 8:50:59 AM UTC-7, jbeattie wrote:
On Friday, September 6, 2019 at 8:01:52 AM UTC-7, Tom Kunich wrote: On Thursday, September 5, 2019 at 10:13:49 PM UTC-7, Chalo wrote: Tom Kunich wrote: Chalo, What do you call those crank standards that fit the press-in bearings BBs? They are narrower than the 386. There are too many Johnny-come-lately nonstandard BB standards to keep track of them all. When I run across one I can't identify (rarely, because my shop is mostly commuters and thrifty upcyclers), I consult a table like Park Tool's. My last mystery solved was a State brand disc brake CX bike with an eccentric BB. When I pulled the thing out, I thought, "this doesn't look quite big enough to be a tandem eccentric shell" and also "f**k me-- a new superfluous GD BB standard". Turns out it was a regular BMX/OPC type shell with a couple of big set screws welded on. That customer got a tubular CrMo crank which was cheaper and cooler than what had been in the original plan. I picked up an FSA crank and it was too narrow for my 386 cups. Eventually I used the rings off of it. That's why you buy a 386 crank for 386 threaded BB. -- Jay Beattie. Didn't you just say that the Q factor was the same on all cranks? Now you're saying that they're different? |
#14
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No bearing = no bearing problems
On Friday, September 6, 2019 at 9:01:16 AM UTC-7, Tom Kunich wrote:
On Friday, September 6, 2019 at 8:50:59 AM UTC-7, jbeattie wrote: On Friday, September 6, 2019 at 8:01:52 AM UTC-7, Tom Kunich wrote: On Thursday, September 5, 2019 at 10:13:49 PM UTC-7, Chalo wrote: Tom Kunich wrote: Chalo, What do you call those crank standards that fit the press-in bearings BBs? They are narrower than the 386. There are too many Johnny-come-lately nonstandard BB standards to keep track of them all. When I run across one I can't identify (rarely, because my shop is mostly commuters and thrifty upcyclers), I consult a table like Park Tool's. My last mystery solved was a State brand disc brake CX bike with an eccentric BB. When I pulled the thing out, I thought, "this doesn't look quite big enough to be a tandem eccentric shell" and also "f**k me-- a new superfluous GD BB standard". Turns out it was a regular BMX/OPC type shell with a couple of big set screws welded on. That customer got a tubular CrMo crank which was cheaper and cooler than what had been in the original plan. I picked up an FSA crank and it was too narrow for my 386 cups. Eventually I used the rings off of it. That's why you buy a 386 crank for 386 threaded BB. -- Jay Beattie. Didn't you just say that the Q factor was the same on all cranks? Now you're saying that they're different? I said nothing about the Q-factor of a FSA 386 crank. I said the Q-factor on a 24mm spindle Shimano Hollowtech was the same regardless of what BB you used. It is a function of crank design and axle/spindle length. And, had you looked, you would know that the Q-factor for FSA 386 crank IS the same as the FSA BB30 crank because the 386 crank arms are straighter. https://bikerumor.com/2011/12/22/fsa...rison-weights/ 146mm for both cranks. Shimano FC6800 is 146.6, or just 146 depending on where you look. Notwithstanding the same Q-factor, a BB30 crank (which is based on a 68mm shell standard) will not fit a BB386, as you learned from your shopping experience. -- Jay Beattie. |
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