Profile’s Tech Tip #12: What is a Profile No Boss Crank?
When we initially brought the Spline Drive sprocket design into Profile and Madera’s inventory, we had to back track a little to make an aesthetically pleasing counter part: Profile’s No Boss Cranks.
What is the difference?
Profile’s Standard 19mm RHD Cranks have a spider boss on the right arm.
Profile’s Standard 19mm LHD Cranks have a spider boss on both the right and left arms.
Though both of these above arm combinations WILL work with a Profile or Madera spline drive sprocket (The boss butts right up to the sprocket’s edge), we created “No Boss” cranks to offer a cleaner look considering you no longer need to use the spider bolt.
For a visual, here’s a Profile Standard 19mm RHD Crank on a Madera Spline Drive Helm Sprocket.
And here’s a Profile No Boss 19mm Crank on a Profile 19mm Spline Drive Sprocket.
There is, however, something to consider when buying Profile cranks: If there is a chance that you will be switching back to a bolt driven sprocket in the future, we would advise staying on either RHD or LHD cranks as those will be compatible with any sprocket (spline or bolt driven).