Phew! Yes, I have seen an earlier external cam model but I refuse to use any external cam QR skewers regardless of material.

I suspect john m flores may be using external cam versions because a 90 degree closure is insufficiently tight.

In post 17 he says he tightens them a bit more than he would do with steel ones.

Well, if I understand correctly, according to maddog34 above (in post #12), the weight is supported by the hub axle itself, not by the QR skewer shaft. The shaft diameter is not a dimension that I have ever thought to measure; I better go replace the batteries for my calipers. Which version of the Enve QR skewers did you measure?

I bought a pair of tittanium Zipp quick releases for my 404 wheels, they have been outstanding

don’t know what wheels you’re using, but in mine (Campag Zondas), the weight sits on the ends of the Al axle that extends a couple of mm into the dropout. I know this because when I sit the bike down on the wheel, it sits square in the dropouts. It’s not sitting on the QR skewer, and the QR is not tightened up. Friction is not in play here. Friction between the face of the axle and the inner face of the dropout when the QR is locked stops the axle from moving about and the wheel from dropping out, but “friction” certainly isn’t weight-bearing.

I have steel QR skewers on all my bikes except for the KHS which has HED titanium skewers. And to echo @john m flores, I do have to crank down on the Ti skewers significantly harder than the Shimano steel skewers, to stop the hub from slipping in the dropout.
I also have Ti skewers on my son's road bike, but that one has vertical dropouts and no issue with slipping so there has been no issue with the Ti skewers in that application.

The Shimano skewer with its internal cam will also clamp tighter than those boutique external cam designs for the same lever pressure.

The point of ultralight gear is not that it works as well as anything else. The point is that it can work acceptable well while being ultra light.

Ti external cam are not a good skewer for shock forks or horizontal dropouts or people with weak hands or people who aren't very mechanical. But with the right bike they are safe and work well enough while shedding weight for a lot less money than going from an Ultegra to Dura Ace rear derailleur.

qft.

https://cimg3.ibsrv.net/gimg/bikefor...c500382df.jpeg


the shaft diameter is significant to me - I prefer 5mm or 4.5 mm … 4.25 mm or so is about the lowest I will accept

sorta / kinda a double whammy if they drop from a quality 5mm steel skewer shaft to a 4mm titanium shaft

I like the DT RWS skewer design - bummed the skewer diameter is around 4.25 mm (for both steel and Ti versions) - but still use them

the 5mm Control Tech and T Gear Ti bolt on skewers appear to provide a more secure connection than most other (if not all other ?) aftermarket / boutique / whatever lightweight Ti skewers … I’ve used them with suspension forks without issue - had issue with many aftermarket lightweight skewers … also used Control Tech bolt on Ti skewers with horizontal dropouts - but with steel skewer nut on the end (to better ‘bite’ into the dropout)

Sheldon Brown would disagree - he cut a hollow axle flush with the locknuts on both ends for a gear/fixed hub, to allow some adjustment of the chain length in vertical dropouts. "So far, no problems with this unorthodox rig".