Benjamin Lewis asked:
Quoted message said:Quoted message said:So, why do velodromes require nuts on solid axles? Does it
have more to do with braking forces? Do they just want to
avoid missaplied quick-release skewers?
Baird Webel replied:
Quoted message said:
The velodromes I have ridden at don't require solid axles,
they require hubs without quick releases. Wheels with
hollow axles and allen key closures are generally
accepted. IMO, this stems from two sources.
Primarily, it is tradition. There is some sort of
misplaced fear that a QR skewer will get hooked, open up,
and cause a crash. Never heard of such a thing on the road
and have a very hard time seeing how it could happen.
I believe that's correct. Furthermore, this requirement
actually considerably predates modern quick releases, I
believe, and was originally intended as a way of prohibiting
the use of wingnuts. I think that wingnuts were perceived,
rightly or wrongly, as a risk of causing stabbing/slashinc
injuries in crashes.
Quoted message said:Second, for races where you put a _lot_ of force on the
rear wheel, i.e. standing starts in the kilo/pursuit and
jumping from a near stop in a match sprint, bolt-on hubs
that are bolted down well will hold the wheel on better.
Of course, the primary person who loses in this situation
is the one who slipped the wheel, so I don't really see
why this is an argument for mandating non-QR wheels,
particularly when the allen key "non-QR" skewers probably
do a worse job of holding the wheel than a good regular
QR skewer.
In a velodrome situation, it would seem that the most likely
time for pulling an axle would be in a match sprint, and
that it would happen at a very low speed, just as the rider
"jumped." That would be the maximal loading.
Sheldon "Quick Release" Brown +----------------------------------------------------------
-+
| It is by riding a bicycle that you learn the contours
| | of a country best, since you have to sweat up the
| hills | and coast down them. | Thus you remember them
| as they actually are, while in a | motor car only a
| high hill impresses you, and you have | no such
| accurate remembrance of country you have driven |
| through as you gain by riding a bicycle. | -- Ernest
| Hemingway, By-Line |
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