Joined: Dec 2019
Posts: 2,841
Likes: 1,062
From: South Shore of Long Island
Bikes: 2010 Carrera Volans, 2015 C-Dale Trail 2sl, 2017 Raleigh Rush Hour, 2017 Blue Proseccio, 1992 Giant Perigee, 80s Gitane Rallye Tandem
Don't worry about the shim, back when bikes were switching from 1" to 1 1/8" profile design was shipping their stems with the spacers and so were other brands. I installed a lot of them and never had a failure. But, you'll need to get a new top cap as well, the 1" will press down on the shim but not the stem for setting the bearings.