FSA SL cranks

I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?



FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."

Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.

-- Jay Beattie.

On Saturday, May 22, 2021 at 9:04:08 AM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces.. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."
Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.

What I think is strange about this FSA SL crank is that it is 24 mm unless I'm making a conversion error - 0.9521 (two lowest digits i may not be remembering accurately)

On Saturday, May 22, 2021 at 11:47:18 AM UTC-7, wrote:
On Saturday, May 22, 2021 at 9:04:08 AM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."
Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.
What I think is strange about this FSA SL crank is that it is 24 mm unless I'm making a conversion error - 0.9521 (two lowest digits i may not be remembering accurately)

Why is that strange? 24mm is the (or one of the) MegaExo standard. This is the BB you need. https://tinyurl.com/465769nf I wouldn't try using a Shimano since FSA used narrower bearings, and a Shimano BB may bind -- at least according to the interweb.

-- Jay Beattie.

On Saturday, May 22, 2021 at 12:15:39 PM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 11:47:18 AM UTC-7, wrote:
On Saturday, May 22, 2021 at 9:04:08 AM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."
Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.
What I think is strange about this FSA SL crank is that it is 24 mm unless I'm making a conversion error - 0.9521 (two lowest digits i may not be remembering accurately)
Why is that strange? 24mm is the (or one of the) MegaExo standard. This is the BB you need. https://tinyurl.com/465769nf I wouldn't try using a Shimano since FSA used narrower bearings, and a Shimano BB may bind -- at least according to the interweb.

Well this all confuses me because Omega is a 19 mm shaft. Maybe I'm missing something there. Is the Omega a square taper or ISIS bearing?

On 5/22/2021 2:37 PM, Tom Kunich wrote:
On Saturday, May 22, 2021 at 12:15:39 PM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 11:47:18 AM UTC-7, wrote:
On Saturday, May 22, 2021 at 9:04:08 AM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."
Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.
What I think is strange about this FSA SL crank is that it is 24 mm unless I'm making a conversion error - 0.9521 (two lowest digits i may not be remembering accurately)
Why is that strange? 24mm is the (or one of the) MegaExo standard. This is the BB you need. https://tinyurl.com/465769nf I wouldn't try using a Shimano since FSA used narrower bearings, and a Shimano BB may bind -- at least according to the interweb.

Well this all confuses me because Omega is a 19 mm shaft. Maybe I'm missing something there. Is the Omega a square taper or ISIS bearing?



I linked general information above. Here's the FSA technical
fro Omega:

https://shop.fullspeedahead.com/en/f...506.1621695207

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

On Saturday, May 22, 2021 at 2:15:04 PM UTC-7, AMuzi wrote:
On 5/22/2021 2:37 PM, Tom Kunich wrote:
On Saturday, May 22, 2021 at 12:15:39 PM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 11:47:18 AM UTC-7, wrote:
On Saturday, May 22, 2021 at 9:04:08 AM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."
Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.
What I think is strange about this FSA SL crank is that it is 24 mm unless I'm making a conversion error - 0.9521 (two lowest digits i may not be remembering accurately)
Why is that strange? 24mm is the (or one of the) MegaExo standard. This is the BB you need. https://tinyurl.com/465769nf I wouldn't try using a Shimano since FSA used narrower bearings, and a Shimano BB may bind -- at least according to the interweb.

Well this all confuses me because Omega is a 19 mm shaft. Maybe I'm missing something there. Is the Omega a square taper or ISIS bearing?

I linked general information above. Here's the FSA technical
fro Omega:

https://shop.fullspeedahead.com/en/f...506.1621695207

FSA should sell a roll of electrical tape as a retrofit to 24mm.

-- Jay Beattie

On Saturday, May 22, 2021 at 2:15:04 PM UTC-7, AMuzi wrote:
On 5/22/2021 2:37 PM, Tom Kunich wrote:
On Saturday, May 22, 2021 at 12:15:39 PM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 11:47:18 AM UTC-7, wrote:
On Saturday, May 22, 2021 at 9:04:08 AM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."
Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.
What I think is strange about this FSA SL crank is that it is 24 mm unless I'm making a conversion error - 0.9521 (two lowest digits i may not be remembering accurately)
Why is that strange? 24mm is the (or one of the) MegaExo standard. This is the BB you need. https://tinyurl.com/465769nf I wouldn't try using a Shimano since FSA used narrower bearings, and a Shimano BB may bind -- at least according to the interweb.

Well this all confuses me because Omega is a 19 mm shaft. Maybe I'm missing something there. Is the Omega a square taper or ISIS bearing?

I linked general information above. Here's the FSA technical
fro Omega:

https://shop.fullspeedahead.com/en/f...506.1621695207
--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971
OK, that says that the Omega is 19 mm.

So apparently MegaExo was different even though it looks the same. (or for that matter the MegaEvo)

On Sat, 22 May 2021 11:47:16 -0700 (PDT), Tom Kunich
wrote:

On Saturday, May 22, 2021 at 9:04:08 AM UTC-7, jbeattie wrote:
On Saturday, May 22, 2021 at 7:59:15 AM UTC-7, AMuzi wrote:
On 5/22/2021 9:42 AM, Tom Kunich wrote:
I have an FSA SL crank and it has a shaft with 24 mm bearing surfaces. Now I don't know of any FSA bottom bracket with 24 mm shafts. MegaEvo is 30 mm if I understand them correct and MegaExo is 19 mm. Since I measured this with a micrometer I know that I can use Shimano bearing cups. But why would this have a shaft so dramatically different than the rest of the FSA stuff?

FSA says:

https://www.fullspeedahead.com/en/technology

(click the crankset image)

Further discussion:
https://accidentalrandonneur.wordpre...ga-bb86-crank/

from that page:
"All of Shimano’s Hollowtech II two-piece road bike
cranksets have a steel spindle 24 mm in diameter. The Omega
BB86 crank, very strangely, has a 19 mm spindle. You can see
both cranksets’ spindles and the difference between them. It
is this that makes the Omega BB86 crankset a bit of a
dead-end product..."
Luckily, the pedal-thread inserts on my FSA ISIS crank broke loose from the surrounding CF before the entire system went obsolete. What a piece of junk. I would criticize FSA for its multitude of standards, but after the demise of square drive, all the manufacturers cycled through a bunch of now-discarded standards. Praxis got a big chunk of the market making OE cranks for Specialized, and its cranks still have weird 28mm/30mm -- and SRAM has 22mm/24mm. It's hard to tell what is not a dead end product.

What I think is strange about this FSA SL crank is that it is 24 mm unless I'm making a conversion error - 0.9521 (two lowest digits i may not be remembering accurately)

0.94488189 I believe is the correct number
0.03937008" = 1 mm
--
Cheers,

John B.