At yesterday's Windsor triathlon the organisers had put down a substantial wooden obstacle at the bike entrance to the transition to ensure that athletes dismounted where they were supposed to. I watched as one competitor leaped off his bike, lifted it over, realised something was wrong, then went back for his front wheel. He ran into the transition area with his bike in one hand and his wheel in the other. Fortunately triathletes use side pull brakes rather than discs. Yesterday was his lucky day.
In "]news:[email hidden], Dave Kahn <[email hidden]> typed:
Quoted message said:
At yesterday's Windsor triathlon the organisers had put down a substantial wooden obstacle at the bike entrance to the transition to ensure that athletes dismounted where they were supposed to. I watched as one competitor leaped off his bike, lifted it over, realised something was wrong, then went back for his front wheel. He ran into the transition area with his bike in one hand and his wheel in the other. Fortunately triathletes use side pull brakes rather than discs. Yesterday was his lucky day.
That can't be right. He must have had disc brakes. Operator errors do not happen. so there can be no other explanation for his wheel falling out. ;-)
"All truth goes through three steps: First, it is ridiculed. Second, it is violently opposed. Finally, it is accepted as self-evident." Arthur Schopenhauer
At yesterday's Windsor triathlon the organisers had put down a substantial wooden obstacle at the bike entrance to the transition to ensure that athletes dismounted where they were supposed to. I watched as one competitor leaped off his bike, lifted it over, realised something was wrong, then went back for his front wheel. He ran into the transition area with his bike in one hand and his wheel in the other. Fortunately triathletes use side pull brakes rather than discs. Yesterday was his lucky day.
That can't be right. He must have had disc brakes. Operator errors do not happen. so there can be no other explanation for his wheel falling out. ;-)
Go and look at the force diagrams again. He picked the bike up.
That can't be right. He must have had disc brakes. Operator errors do not happen. so there can be no other explanation for his wheel falling out. ;-)
As he was using side-pulls we can be fairly confident that it was operator error, and I don't think anyone has ever maintained that operator error does not happen. Indeed I warned someone at the start of a club run earlier this year that his (rear) QR was open, and he was both touchingly grateful and mightily embarrassed. Given that operator error is not unknown it's clear that designing a wheel ejecting force into the braking system is bad engineering. Whether QRs used with disc brakes can come undone in the absence of operator error is another matter.
"All truth goes through three steps: First, it is ridiculed. Second, it is violently opposed. Finally, it is accepted as self-evident." Arthur Schopenhauer
Dave Kahn <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
At yesterday's Windsor triathlon the organisers had put down a substantial wooden obstacle at the bike entrance to the transition to ensure that athletes dismounted where they were supposed to. I watched as one competitor leaped off his bike, lifted it over, realised something was wrong, then went back for his front wheel. He ran into the transition area with his bike in one hand and his wheel in the other. Fortunately triathletes use side pull brakes rather than discs. Yesterday was his lucky day.
-- Dave...
Wasn't me! I have read the newsgroup, and Sheldon's pages, like a good boy and made d@mn sure that it was tight when i put it back together.
However, the chunk of wood to enforce the dismount was a big surprise - I've never yanked the brakes and popped my feet out of the pedals so fast before! If you saw a shiny blue ten-speed with 27" wheels (whose nice tan sidewalls were a real distinguishing feature next to the shiny new bikes in transition) - that was me - and I had a ball!
