Despite being one of the lighter stems around, the Syntace F139 carries the DH 2002.4 test standard for downhill racing, so it comfortably exceeds expectations for use on a road bike.
There are no washers underneath the bolt heads, but we needed no more than the recommended 8Nm of torque to get the handlebars ﬁrmly secured. You might ﬁnd that you may need extra spacers under the stem if you’re upgrading, as the steerer clamp is not as tall as most stems'.
Deﬂection testing and use showed that this is a stiff stem indeed, and coupled with its quality and ease of ﬁtment this is a real cracker for the money.
As well as 6 or 17 degree versions, it’s also available in a polished ﬁnish with titanium bolts (£64.71). If you still need convincing, there’s a 10 year guarantee too.