I'm also about to swap out the Thomson X2 stem for the X4. From riding a bit with the X2 it has been slipping on me. I am a big guy and it only happens when I'm leaning on the bars... but at times I lean on the bars... so it must go.
I'll try a X4 as I want the Thomson excellent quality but want it to remain functional and robust. Weight is not something I'm bothered about so I won't cry over 40g
I'm also about to swap out the Thomson X2 stem for the X4. From riding a bit with the X2 it has been slipping on me. I am a big guy and it only happens when I'm leaning on the bars... but at times I lean on the bars... so it must go.
I'll try a X4 as I want the Thomson excellent quality but want it to remain functional and robust. Weight is not something I'm bothered about so I won't cry over 40g