On Friday, January 25, 2019 at 9:24:37 PM UTC-5, AMuzi wrote:
On 1/25/2019 8:01 PM, Frank Krygowski wrote:
On 1/25/2019 5:09 PM, Zen Cycle wrote:
On Sunday, January 20, 2019 at 7:30:11 PM UTC-5, Sir
Ridesalot wrote:
On Sunday, January 20, 2019 at 4:36:46 PM UTC-5, Mark J.
wrote:
Check out the ninth photo in this gallery, apparently an
orthopedic
device. I don't know anything beyond the caption, but
the visuals are
quite striking.
https://www.velonews.com/2019/01/new...ng-camp_482921
Mark J.
Thank you for something BICYCLING related! LOL
I found the image with the derailleur hanger between the
frame and the cassette to be pretty interesting. I(t's
the first image that doesn't have riders in it. I've
never seen such derailleur a setup before.
Cheers
It's a 'thru-axle' set up. They've been around on MTBs for
quite a while. They offer greater stiffness at lighter
weight. It's one of "standards" that aren't (like various
BB 'standards'). The UCI has been allowing them in lieu
of open dropouts with 'lawyer tabs' so expect to see
greater cross compatibility as time goes on. Here's a
primer on the technology:
http://www.bikebug.com/blog/everythi...ut-thru-axles/
Nice to see some bike tech discussion.
I note in that article, "Thru Axles (TA) originally were
designed for downhill riders years ago who were popping
their front wheels out of their front axles."
Does anyone remember the intense debates here about whether
that problem actually existed? Seems it's now well recognized.
ISTR that we agreed here on RBT it was a front disc specific
problem. With the ubiquitous behind-the-blade mount on
current popular discs, through axles make sense.
I can't imagine what disk brakes would have to do with it, but I haven't seen those arguments. The issue was that even with a solid bolted axle, the fact that the dropouts were open meant the wheel could dislodge. The through axle design offer better rigidity, and of course an infinitesimally small probability of the wheel popping out of a fork with a closed dropout.
I'll leave rear through axle explanation as an exercise for
the reader.
Similarly, a broken rear axle could dislodge from an open dropout, so the same philosophy applies to rear hubs/dropouts. It seems to be a bit of overkill to apply that to a road bike except for the fact that the thru axle will give more rigidity at less weight.