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Ender
Ender
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My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup (left side) since I misaligned it when installing and it got stuck in the shell. I wonder if a 68mm left side cup is exactly the same as a 73mm cup and they are interchangeable. If so I'll look to find a 68mm cup as they are more abundant.

I also wonder if installing a 68mm BB on a 73mm shell would cause cross threading. Because the BB shell of my bike is cross threaded (and I cannot fix it).

According to the Sheldon Brown's website they have a little bit different threading as 68mm is 1.370" X 24 tpi and 73mm is 1.375" X 24 tpi.

enter image description here

My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup (left side) since I misaligned it when installing and it got stuck in the shell. I wonder if a 68mm left side cup is exactly the same as a 73mm cup and they are interchangeable.

I also wonder if installing a 68mm BB on a 73mm shell would cause cross threading. Because the BB shell of my bike is cross threaded (and I cannot fix it).

According to the Sheldon Brown's website they have a little bit different threading as 68mm is 1.370" X 24 tpi and 73mm is 1.375" X 24 tpi.

My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup (left side) since I misaligned it when installing and it got stuck in the shell. I wonder if a 68mm left side cup is exactly the same as a 73mm cup and they are interchangeable. If so I'll look to find a 68mm cup as they are more abundant.

I also wonder if installing a 68mm BB on a 73mm shell would cause cross threading. Because the BB shell of my bike is cross threaded (and I cannot fix it).

According to the Sheldon Brown's website they have a little bit different threading as 68mm is 1.370" X 24 tpi and 73mm is 1.375" X 24 tpi.

enter image description here

added 11 characters in body; edited title
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Ender
Ender
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Are 68mm and 73mm bottom bracket left side cups interchangeableidentical?

My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup (left side) since I incorrectly installedmisaligned it on the shellwhen installing and it got stuck therein the shell. I wonder if a 68mm left side cup is exactly the same as a 73mm cup and they are interchangeable.

I also wonder if installing a 68mm BB on a 73mm shell would cause cross threading. Because the BB shell of my bike is cross threaded (and I cannot fix it).

According to the Sheldon Brown's website they have a little bit different threading as 68mm is 1.370" X 24 tpi and 73mm is 1.375" X 24 tpi.

Are 68mm and 73mm bottom bracket cups interchangeable?

My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup since I incorrectly installed it on the shell and it got stuck there. I wonder if a 68mm left side cup is exactly the same as a 73mm cup and they are interchangeable.

I also wonder if installing a 68mm BB on a 73mm shell would cause cross threading. Because the BB shell of my bike is cross threaded (and I cannot fix it).

According to the Sheldon Brown's website they have a little bit different threading as 68mm is 1.370" X 24 tpi and 73mm is 1.375" X 24 tpi.

Are 68mm and 73mm bottom bracket left side cups identical?

My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup (left side) since I misaligned it when installing and it got stuck in the shell. I wonder if a 68mm left side cup is exactly the same as a 73mm cup and they are interchangeable.

I also wonder if installing a 68mm BB on a 73mm shell would cause cross threading. Because the BB shell of my bike is cross threaded (and I cannot fix it).

According to the Sheldon Brown's website they have a little bit different threading as 68mm is 1.370" X 24 tpi and 73mm is 1.375" X 24 tpi.

Source Link
Ender
Ender
  • 2.2k
  • 11
  • 32

Are 68mm and 73mm bottom bracket cups interchangeable?

My MTB has a 73mm bottom bracket shell but it had 68mm BB installed. I found and purchased a Shimano BB-ES300 73mm BB but unfortunately I had to break apart its plastic cup since I incorrectly installed it on the shell and it got stuck there. I wonder if a 68mm left side cup is exactly the same as a 73mm cup and they are interchangeable.

I also wonder if installing a 68mm BB on a 73mm shell would cause cross threading. Because the BB shell of my bike is cross threaded (and I cannot fix it).

According to the Sheldon Brown's website they have a little bit different threading as 68mm is 1.370" X 24 tpi and 73mm is 1.375" X 24 tpi.