Thomson stem issues
I have recently added a Thomson stem to my camber 29er and have noticed a lot of play in the headset. I changed back to the stock stem (specialized own branded) and the play disappears. On investigating the specialized stem there is a small shim marked 8. 16. This appears to have a slight bevel to it
Has anyone had similar issues or know of a solution to my woes?
Thanks in advancePosted 4 years agorobarnoldMember
The stock stem has an insert that allows you to change the angle of rise/fall, that is what the 8/16 refers to. I think you’ll find that it’s prefixed by a + or -. The gap in the insert must line up with the gap in the stem. The stem comes with an eccentric top cap which you shouldn’t use with a standard stem as the hole for the bolt isn’t centred.
As Tom says, all this probably has nothing to do with your headset, you’ll be bottoming out your top cap on your steerer. If any part of the underside of the top cap is touching the fork steerer the whole lot won’t preload the bearings. You need a good 3-4mm gap between the top of the steerer and the top of the stem before you start tightening up the top cap. Put a slim spacer between stem and top cap and you’ll be laughingPosted 4 years agoSTATOMember
Apparently the speccy top cap is offset and needs replaced if you change stem, tho as its only preloading the headset its not that important once the stem is done up.
What he is saying tho, before you fit the top cap you should check the top spacer should sit above the top of the steerer by a few mm, this is to ensure when you tighten the top cap there is space to take up the slack. No space here = slack in headset = rattle.
Therefore, you may need to add another spacer?Posted 4 years agotitusriderMember
What everyone is trying to say is it should look like this only less soPosted 4 years ago
The topic ‘Thomson stem issues’ is closed to new replies.