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So you've got a 1¼" steerer on your forks and want to replace the stem that came with it?
Yes, exactly that! This tube is thicker wall than the one on the stem, so I just need to lick it open a little at the top with a reamer to fit the top cap. Pretty sure we’ve got an adjustable one upstairs so I can do it by hand.
Jonny69-
I had a 1 1/4” steerer on the gf’s hybrid (old GT triple triangle), my solution was to shim it to 1” and then you can get a threadless adapter like one @frankenbike posted
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A standard ahead 1⅛" top cap might work too (instead of reaming) - it will overhang a little bit I guess - but I suppose they're not intended to take quite as much force as a proper one off a quill stem...
But less destructive/irreversible than reaming :)
packet
frankenbike
Woah, A* bodgery efforts! So you've got a 1¼" steerer on your forks and want to replace the stem that came with it? I had it backwards - I thought you'd bought the stem but it didn't fit as the quill bit was too big, if you know what I mean.
I get it now. So yeah that one I posted won't work if it's got the step, I guess it must fit into a 1⅛" steerer.
Edit: if your idea doesn't work, you could also cut off the horizontal part of the old stem, file it smooth, and then clamp the new stem onto it. For example if the new silver bit of steerer had walls that are too thin to take the expander wedge bit or something.