1" stem spacers

Tried to search on this but found nothing:

I have got one of these: http://www.sjscycles.co.uk/profile-design-stem-convertor-1-inch-quill-to-1-1-8-inch-threadless-prod20442/ on a bike with a fair bit of stem showing so ordered some of these: http://www.sjscycles.co.uk/dia-compe-headset-spacer-1-inch-alloy-black-prod22312/ to fit over the exposed stem. Problem is they don't fit flush with the stem as I think they should. They move about on top of one another (shifting a couple of mm horisontally) over time and I think contribute to loosening the stem.

Only thing I can think is they are the wrong size spacer but they definitly said 1" on the packet!

Any ideas?

the 1inch spacers are for 1inch threadless forks. you have 1" threaded forks, so the spacers are 25.4 internal dia going on a 22.2mm external diameter stem (before you reach the 1.125" part).

i do not know how threadless stem adaptor should be installed so can help you no further, consult the installation leaflet that came with your adaptor.

Hi Tim - as VL says, the spacers are designed to go over a steerer not a stem, your quill to ahead adaptor is still basically a quill stem in terms of size and function. You might do better to find some alloy tubing with an ID closer to the adaptor OD and cut a piece the right length using a steerer cutter jig (or mitre box) to get it neatly square. However, I am more concerned that you think the spacers are contributing to the stem loosening! Mechanically, the quill adaptor should be expanded tightly in the steerer and should not slip at all, equally the ahead stem should be clamped tightly around the adaptor and should not move. If either are 'slipping' they are not fitted correctly, irrespective of any vanity spacers. The other thing you could try is using some packing between the spacers and the quill adaptor to stop them moving around, like some flexible plastic or even old inner tube. You are not going to find an off the shelf product that will have the correct I.D., what you bought is correct for its intended purpose!