Even if you’re not a self proclaimed ‘weight weenie’, as a cyclist you still probably care about weight. Right? While it’s common to mind the grams, it’s also common for modern frames to add a bit of weight as they transition to disc brakes, thru axles, tapered steerers, etc. That seems to be the inspiration behind Seven’s latest upgrade package called the XX.

Offered on titanium bikes like their Evergreen gravel build, the XX package claims to drop 170-255g from the weight of the frame without sacrificing durability or making it too flexy.

To get there, Seven’s engineers looked at nearly every design feature of the bike and picked off gram by gram. Asymmetric dropouts save about 60g and increase drivetrain stiffness. Asymmetric chainstays save another 6g and again increase drivetrain stiffness. Moving to an internal seatpost binder saves 33-45g and the 30.9mm titanium seatpost saves another 30g+ over a 27.2mm post. Inside the frame, 14g were removed from additional bottom bracket shell machining and 12g were shaved by enlarging the frame’s breather holes inside the tubes. A new flat mount brake caliper drops 13g, and the frame itself is slightly more compact with new tube butting and a modified tube profile section to take care of the rest.

Seven calls it the ‘apex of cycling weight reduction’ which can be added to any SL or SLX disc brake titanium frame for $995 starting immediately.

sevencycles.com

23 COMMENTS

  1. So, even if your not a self proclaimed “weight weenie”, you’ll still want to shell out $995 to save 170-255 grams? Sure. It’s time to stop being a shill for the industry and view these press releases with a critical eye.

  2. not a critical design flaw, but the way that rear caliper is cantilevered off the dropout sure isn’t pretty, or structurally efficient.

  3. Any cyclist with years of experience, who has transitioned from quill stems to threadless style headsets and stems will tell you a clamp holds tighter than a wedge. This recent trend towards internal wedge seat clamps is another stupid idea.

    • That one has me head-scratching too. I cannot see how that mechanism could possibly be lighter (or as effective) than a pair of welded on clamp bosses and bolt, or even a lightweight alloy clamp.

    • I’m by no means endorsing integrated wedge seat clamps, but you have to remember tolerances back then were a lot worse than they are today, which played a factor. Also friction compound didn’t exist.

    • Agree, especially on a metal frame. A small cut and a light, replaceable clamp seem to be a KISS approach.
      I can understand the wedge styles on CF frames, but this one…not sure what I am getting and it looks bad too.

    • that over complicated wedge system certainly does not save weight, and for all intents and purposes, creates a hinge in the top tube right in front of the seat tube. Again, probably not a critical design flaw, but just flat out stupid and wasteful.

    • Shortening up the chain stays would do wonders for the appearance of this bike. Also, increasing the stack height to get rid of one or two of the stem spacers wouldn’t hurt.

      • Seven doesn’t understand chainstay length and will tell you that they know best with all of their data. With 455mm being on the short side of stays for their MTBs they are stuck in 2006.

  4. A light weight post clamp is 10 g or less. Why mess with an internal mech that could fail or worse yet lead to frame failure? Yeah rememeber the days of stuck quill stems?

  5. Integrated seat wedges were done purely for aerodynamics; nothing here is aerodynamic. Titanium frames are admired for pure simplicity, not headaches.

What do you think?