ballooney
I live for the CABE
Bike: '49 B6
Problem: crank arm will not clear the chain guard.
Outer Measurements between chain stays taken at the drop out (5") and just after the kickstand housing (4 1/4") are the same as another B6. So there doesn't appear to be a bend in the frame after the bottom bracket.
Crank that came on the bike appeared bent so I replaced it with the crank that works fine on another B6. Here is the crank that came on the bike...looks to be a 1" flare when using two straight edges:
Here is a crank that is straight for comparison. Looks to have a 3/4" flare:
With a straight crank on the bike in question, here are my clearances:
Compared to a B6 with no issues:
The B6 with the clearance issue seems shifted in that there is plenty of clearance on the non-drive side but almost no clearance in the drive side. Just the opposite of the good B6.
What got me here? The bike rode oddly under feet like a bent shaft on a pedal. So I started pulling it apart...pedal shaft was straight. Pulled the crank and noticed it was bent...ah ha! Picked up a straight crank and boom, clearance issues. Must be a bent frame in which the original crank was bent out to accommodate the clearance issue but the measurements on the chain stats match a good bike. So what gives?
Sent from my iPhone using Tapatalk
Problem: crank arm will not clear the chain guard.
Outer Measurements between chain stays taken at the drop out (5") and just after the kickstand housing (4 1/4") are the same as another B6. So there doesn't appear to be a bend in the frame after the bottom bracket.
Crank that came on the bike appeared bent so I replaced it with the crank that works fine on another B6. Here is the crank that came on the bike...looks to be a 1" flare when using two straight edges:
Here is a crank that is straight for comparison. Looks to have a 3/4" flare:
With a straight crank on the bike in question, here are my clearances:
Compared to a B6 with no issues:
The B6 with the clearance issue seems shifted in that there is plenty of clearance on the non-drive side but almost no clearance in the drive side. Just the opposite of the good B6.
What got me here? The bike rode oddly under feet like a bent shaft on a pedal. So I started pulling it apart...pedal shaft was straight. Pulled the crank and noticed it was bent...ah ha! Picked up a straight crank and boom, clearance issues. Must be a bent frame in which the original crank was bent out to accommodate the clearance issue but the measurements on the chain stats match a good bike. So what gives?
Sent from my iPhone using Tapatalk