Threaded stem advice - minimum insert

[SimonJC]

Hi everyone, no doubt this is an easy one for you experts out there!

I am planning to fit a threaded stem to my forks, however there is no minimum insert mark showing on the stem. The stem 'shaft' is quite short.

The length of the stem is 72mm total length, the 'wedge' end is 35mm length (this would be effectively the length of the shaft if the stem was fully in the fork, measured from where the wedge starts, if you know what I mean).

Can anyone advise please the maximum height of the stem, ie the minimum of amount of stem that could be allowed in the forks for safe usage?

 

[hamster]

Usually there is a little line, some dots or an arrow.

I would want at least 50mm inside the steerer.

 

[half cog]

Re:

Time was it was said that the wedge should not be within the threaded section of the fork.That section being thinner because of the threads. However there are a lot of forks on the market now with very long sections of thread. This is fine for the fork manufacturers as it means they can be cut down to fit allmost anything. It does however mean that a lot of people are running the wedge in the thread section.I also think that it depends a lot on the type of wedge used.The circular thin wedges( allmost like a thick washer )put more stress on threads than a proper wedge.Its hard to put a do or dont on this as you will allways find someone who has been doing the opposite for years with no problems whatsoever.If it is an mtb you need to be extra cautious as the front end gets a lot more jolts than a road bike. If I had real worries I would swap the stem. A stem failure is going to cost you a lot of pain and money at the very least and probably a lot worse.I have had two syncros stems with no markings and have run them as low as I could tolerate. Just not worth it .
peter