Please I need some help.
I'm trying to fix the chainline offset as I'm designing a frame using Shimano Alfine 11 DI2 (SG-S705) and the Gates Carbon Drive.
I'm having a 12mm issue on the chain line.
So far I've got able to draw a assymetric chainstay to go around the belt avoiding a chainstay coupler and enabling larger tire clearance.
How do I adjust the offset from sprocket to hub ?
I'm trying to build clearance for 35mm tires and a bit of mud. Will use an Eccentric BB. Feel free to suggest as this is my first time designing a frame.
It looks like you've correctly set up your hub flange dimensions to reflect the published specs for the Shimano Alfine 11 Di2. The Gates documentation suggests a "Belt line" dimension of 39.8mm (Dimension A in the diagram below).
Although you cannot directly enter this dimension in BikeCAD, you can show this dimension in the Dimensions dialog box by selecting Stays (auxiliary view) >> General >> Rear chainline. The position of the rear cog can be located in BikeCAD with dimension Z in the "Sprockets" section of the Drivetrain dialog box. Dimension Z locates the rear cog with respect to the inside face of the drive side dropout. Therefore, Z = O.L.D./2 - Rear chainline. Subbing the appropriate numbers in, we get Z = 135/2 - 39.8, or Z = 27.7. I've changed this dimension in your model to get the result below:
Great, thank you very much, now I can continue playing with the exquisite drive side chainstay and see if it's still necessary.