Renthal Apex 35 stem 5 months review

Ren thal Apex 35 50mm_2478
Renthal Apex35_1029edit


  • The stem held the bars well, there were no issues with losing bolts or any other issues.

So far I haven’t had a Stem that held on to the handlebar as well as the Apex 35 stem, I went for many months from the middle of the winter to the spring without ever needing to do anything. It outperformed the Race Face Atlas Stem.
It might be the smart clamp design, maybe the materials used helped too, The stem is made of 2014 & 7075 alloy. it’s not only the bar that’s held on securely, but also the stem to the steerer-tube, so I have had I haven’t had issue with play in the headset, because the stem holds on so securely, the bolts don’t loosen fast like most stems I have used in the past, for example Race Face Atlas, I have experienced play in the headset & handle bars slipping, due to bolts getting loose, but never with Renthal Apex.

I of course thread locker, I use Loctite 243, which I have used on all of the stems I used.

The only times I made it loosen was without Loctite or not cured with big temperature change.

Renthal Apex 35 stem
  • The rental stems have great design, which allows low weight, But I did not notice any difference in stiffness & ride feels, from the Race Face Atlas Stem, which is heavily overbuilt.
  • The stem is well machined, very smooth, no rough surfaces, but the edges are not rounded off to the section between steerer and handlebar are quite pointy, but this does not matter much, unless you slam your hand there, which is unlikely.
Exposure Lights Six Pack MK9


  • The bolts showed signs of wear after the first installation, the tolerances between the tool and the bolts are quite loose, the diameter measurements are between 4.15 up to 4.24mm The park tools measurements are 3.99mm, the after few times of tightening the headset, I managed to damage the bolts, the bots became more damaged after tightening headset. The caliper might have not been very accurate, but I know the tool is not as snug fitting as I think they should be. I later used Teng tools bits, which fit better than Park Tool, but still there is a lot of play.
Renthal Apex 35 bolts wear_0748

It might be that the bolts I got are just a manufacturing fluke for this batch, but there is no way for me to know for sure, but if all bolts are like this, this is a disappointment and should be addressed ASAP, but the Hex key only slipped once, I haven’t had issue since then.

Side view_20190110_182855edit
exposurelightsexposuresixpackmk9 _20190110_182900edit

A rider had issue with two stems cracking, he did enduro riding, but I haven’t had this happen yet.

read more about it here:



I can recommend this stem, This stem seems like a great option if you want lightweight, durable, stiffness, This is one of the lightest stems the market now, and it’s robust, Apex35 Will go on my next bike(s).

5 thoughts on “Renthal Apex 35 stem 5 months review

    1. I use Loctite 243,and race face Sixc35 handlebar, I don’t know what’s different with your set up, but I managed to get the stem bolts loose in the winter, but that was before Loctite had cured, I also did a test with no fresh loctite, when I tightened the headset, and I managed to get the stem to spin on the steerer, but this never happen with Loctite 243,and did not happen anywhere else like the bar clamping bolts which had Loctite on. Keep in mind that rapid temperature changes and hard riding will make it happen fast, but do far this has been a quite secure stem, but I will update on further developments, I will eventually update the post mentioning this.
      I got issues with the headset wearing out fast, but this is not due to the stem, as this stem stays secure as long as as you use Loctite 243, and even without it’s pretty secure, as long as not too big temp changes happen.
      I have had it on another bike with Chris King headset, no issue with loose headset there, but it was press fit and good headset.
      but the headset I got is a mix of Cane Creek at the top and Enduro at the bottom.
      the wear on the headset has been a regular thing, but I always tightened it down when needed, long before it could cause any frame failure, or crushed headset, but I definitely want a better headset, I think your problem is probably the same as mine, the headset being the problem.


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