Well you can buy a shim to fit a 1” quill stem in a 1 1/8” threaded fork steerer https://www.ebay.co.uk/itm/Aluminium-Shim-to-Fit-1-Inch-22-2-mm-Quill-Stem-to-1-1-8-Inch-Forks-/193653881253?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0
I’d prefer to buy a 1 1/8” quill though
@MCamb started
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Well you can buy a shim to fit a 1” quill stem in a 1 1/8” threaded fork steerer https://www.ebay.co.uk/itm/Aluminium-Shim-to-Fit-1-Inch-22-2-mm-Quill-Stem-to-1-1-8-Inch-Forks-/193653881253?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0
I’d prefer to buy a 1 1/8” quill though