I'm building a new bike with disc brakes and I've been reading about all the safety issues around disc brakes causing wheels to pop out of quick release dropouts, so I decided to opt for Thru Axle instead thinking it would be two closed ends.

However when I unpacked the fork just now, it's still got a vertical dropout on the non-drive side, meaning the same thing could happen anyway right?

Is there some advantage to having an open dropout like this that I'm missing?

by ex-cession

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2 Comments

  1. I’m guessing that’s a disc trucker fork.
    And imho that should be ok. Even ingenious if you ask me. Since it’s easier to remove the wheel, since you don’t need to remove the axle all the way.

    Also, that’s a road fork, apart from increased side to side stiffness, there is no need for it to have beefy dropouts.

    And there are even 15mm far bike forks with both dropouts open

  2. It’s a weird Surly thing. All I can say is my Karate Monkey has a similar setup and has been fine.

    On my KM, the closed side isn’t threaded. The axle goes all the way through and there’s a cap with M5(?) screw to hold it all in place: [https://surlybikes.com/parts/thru_axles](https://surlybikes.com/parts/thru_axles)

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