• Hi smart bike people,

    I’m trying to put a new 105 derailleur on my old Roberts steel.

    On the new mech, the bracket projection bit has very little purchase on the hanger end tab - a combination of short pins on the mech bracket, and a raised face on the hanger.

    Previously the bike had a sram rival mech with a much wider and deeper projection, so this issue never came up.

    Is this too sketchy?
    Is there a solution that doesn't involve a new hanger?

    Thanks for any help!


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