AASQ #142: Why are brands moving Boost frames from 52mm to 55mm chainlines?

We know, there’s no such thing as a stupid question. But there are some questions you might not want to ask your local shop or riding buddies. AASQ is our weekly series where we get to the bottom of your questions – serious or otherwise. Hit the link at the bottom of the post to submit your own question.to discuss why more and more of the big frame manufacturers are moving their Boost spacing mountain bikes from the standard 52mm chainline to a 55mm chainline.

From a frame engineering point of view, even tiny increases in clearance in this critical area can substantially help with frame strength, stiffness, and/or tire clearance. We are always fighting for space in the area around the widest point of the tire and the chainring. To move to 55mm, therefore, presents a good opportunity for us to progress the performance of our frames.

“it’s really a convention dictated by the drivetrain manufacturers. Anytime the drivetrain manufacturers can give us a couple more mm in that critical area for tire clearance and pivot junctions and bolstering chainstays, we’ll take it every time.”.

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