Right BB length for shimano fc-m730 cranks?

[Miyata-san]

Hello!
Just wanted to ask íf anyone could help me with this one. My bike has 135mm rear hub and fc-m730 cranks. I read earlier that 122,5mm bottom brackets are recommended for the FC-m730 crankset but does the 135mm rear hub mean that I should get a 127,5mm BB instead of 122,5mm to achieve the right chainline?

 

[Piotr]

for 68 and 73 mm
D-EL - 127,5
D-NL - 122,5

 

[Miyata-san]

for 68 and 73 mm
D-EL - 127,5
D-NL - 122,5

Forgot to mention that my bb shell is 68mm. So I should go with 122,5 correct?

 

[Tootyred]

but does the 135mm rear hub mean that I should get a 127,5mm BB instead of 122,5mm to achieve the right chainline?

No. 122.5 in standard form on a 68mm is just fine. In fact 122 or 120 will be great too. Its 1mm each side....

 

[Miyata-san]

No. 122.5 in standard form on a 68mm is just fine. In fact 122 or 120 will be great too. Its 1mm each side....

Thanks for clearing that out! Huge help!

 

[Piotr]

Shimano recomended 122,5
Another firms do 122,5 and 122, are ok.
120 maybe so short for proper operation

 

[Miyata-san]

Shimano recomended 122,5
Another firms do 122,5 and 122, are ok.
120 maybe so short for proper operation

I am specifically looking for shimano bb-m730 and I have noticed it comes in both 122,5 and 122. Maybe one of these is asymmetrical and one isn't?