Hello all,
I am in the process of replacing my tripple crank with a double.
I just removed the old crank arms and BB, I will need a new BB so that both of the double crank arms are the same distance from the center of the bike.
In trying to determine the correct new size BB I installed the double arms on the originall BB and can see a 5mm farther distance on the drive side.
The original BB is a Shimano BB-UN52 68 and under this it says BC1.37x24. What does this mean? I believe the overall BB lenth is 113mm mesured with a ruler.
Do I need a 109 in order to eliminate the 5mm defferance? Is all of the differance on the drive side??
Please help
Wally
I am in the process of replacing my tripple crank with a double.
I just removed the old crank arms and BB, I will need a new BB so that both of the double crank arms are the same distance from the center of the bike.
In trying to determine the correct new size BB I installed the double arms on the originall BB and can see a 5mm farther distance on the drive side.
The original BB is a Shimano BB-UN52 68 and under this it says BC1.37x24. What does this mean? I believe the overall BB lenth is 113mm mesured with a ruler.
Do I need a 109 in order to eliminate the 5mm defferance? Is all of the differance on the drive side??
Please help
Wally