You are reading a single comment by @Oswald and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@Oswald
Max was designed 'rule of thumb' to resist sideways forces at the bottom bracket with it's orientated ellipse profile. The ellipse is 40.3 x 30 and the tube has a 0.5 wall at max butt position. Considering locally the bottom bracket end where the ellipse is orientated on the x axis then the second moment of area using the above numbers is roughly 0.99cm4 so more rigid then a round 953 tube at this point to a force in the x axis .. however the tube shape transitions along the length and the second moment of area changes along the length and also in practice I don't believe the forces experienced would be aligned with the x axis only .. so honestly I can not calculate which is overall more rigid, I'd suggest Max.