Why I prefer rim brakes over disk brakes
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unwise. there for safety reasons.
That's not good...Why would you do that ??
Gentullio Campagnolo invented the quick release a flawless piece of equipment for bicycling enthusiasts. He didn't invent the ignorant people who can't or won't follow instructions. He didn't invent the bicycling industries proclivity for making products as cheap in quality as possible.
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To me it seems logical that anyone that sprung for CF rims would want disc brakes. Why scab up super expensive CF rims.
The other logical reason is that bikes with disc brakes can have rims that are stronger, lighter, and more aero.
The other logical reason is that bikes with disc brakes can have rims that are stronger, lighter, and more aero.
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Threads will eventually strip if they're repeatedly over-torqued. But QR skewer threads won't wear out from repeated hand tightening. Not enough torque.
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Those QR threads are not going to wear out.
Threads will eventually strip if they're repeatedly over-torqued. But QR skewer threads won't wear out from repeated hand tightening. Not enough torque.
Threads will eventually strip if they're repeatedly over-torqued. But QR skewer threads won't wear out from repeated hand tightening. Not enough torque.
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Below is a list of WT pro bikes this year. Only the Pinarello still has rim brakes and will almost certainly switch to discs for 2022. Then maybe disc brakes will be good enough for you to try?
https://www.cyclist.co.uk/in-depth/9...21-a-breakdown
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But if an insufficient number of threads were engaged, that definitely can strip threads. The rule-of-thumb minimum thread engagement for a 5 x 0.8mm bolt is 6 threads.
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I agree. The industry is ultimately driven by tech, performance and demand. I'm pretty confident that disc brakes are the end game as far as performance bike braking goes.
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[QUOTEI don't think being loose and rattling would be enough to strip those threads. 5 mm stainless threads are pretty darn strong.
But if an insufficient number of threads were engaged, that definitely can strip threads. The rule-of-thumb minimum thread engagement for a 5 x 0.8mm bolt is 6 threads.][/QUOTE]
Your assumption is incorrect.
But if an insufficient number of threads were engaged, that definitely can strip threads. The rule-of-thumb minimum thread engagement for a 5 x 0.8mm bolt is 6 threads.][/QUOTE]
Your assumption is incorrect.
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The number of engaged threads is not going to differ between a hand-tightened QR and a properly tightened QR.
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Originally Posted by Rick View Post
... if an insufficient number of threads were engaged, that definitely can strip threads. The rule-of-thumb minimum thread engagement for a 5 x 0.8mm bolt is 6 threads.]
... if an insufficient number of threads were engaged, that definitely can strip threads. The rule-of-thumb minimum thread engagement for a 5 x 0.8mm bolt is 6 threads.]
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The number of engaged threads is not going to differ between a hand-tightened QR and a properly tightened QR.
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I don't think being loose and rattling would be enough to strip those threads. 5 mm stainless threads are pretty darn strong.
But if an insufficient number of threads were engaged, that definitely can strip threads. The rule-of-thumb minimum thread engagement for a 5 x 0.8mm bolt is 6 threads.
But if an insufficient number of threads were engaged, that definitely can strip threads. The rule-of-thumb minimum thread engagement for a 5 x 0.8mm bolt is 6 threads.
OK then, which assumption do you think I get wrong, and why?
You must be a mechanical engineer with two degrees from Stanford, aren't you?
No wait--that's me. And they taught us about fasteners there (good school).
Practical test: clamp a QR skewer in a bench vise, screw nut loosely on end, hit nut on end with 10 lb sledge hammer 100 times, inspect for thread damage.
Observation: skewer slightly bent, no evidence of thread damage, nut threads on and off easily.
Correction: a 12-lb sledge hammer.
Last edited by terrymorse; 05-24-21 at 06:11 PM.
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Practical test: clamp a QR skewer in a bench vise, screw nut loosely on end, hit nut on end with 10 lb sledge hammer 100 times, inspect for thread damage.
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^^^^ This is what's happening, goes along with the growing adoption of discs. Horses for courses. QRs were fine for rim brakes, TAs better for discs.
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Saying something is wrong multiple times, without explanation, does not convince.
Again, what are your qualifications on strength of materials in general, and fasteners in particular?
Again, what are your qualifications on strength of materials in general, and fasteners in particular?
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I say no, it’s really unlikely that would damage the threads, either.
A simple and common failure mode is the most likely.
Stripped threads almost always happen when a nut is being installed. Either by applying too much torque, or by cross-threading the nut onto the bolt. Since these are hand-tightened nuts, over torquing is unlikely. My best guess would be crossed threads.
These other speculations that some cyclic stresses are somehow damaging threads while riding are just that. Pure armchair speculation. Cyclic stresses break bolts, they don’t strip threads.
A simple and common failure mode is the most likely.
Stripped threads almost always happen when a nut is being installed. Either by applying too much torque, or by cross-threading the nut onto the bolt. Since these are hand-tightened nuts, over torquing is unlikely. My best guess would be crossed threads.
These other speculations that some cyclic stresses are somehow damaging threads while riding are just that. Pure armchair speculation. Cyclic stresses break bolts, they don’t strip threads.
Last edited by terrymorse; 05-25-21 at 11:19 AM.
#74
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Arguing with a person's experience and preference is fruitless.
I prefer drum brakes; mine are very smooth and quiet, they have a nice feel.
I prefer drum brakes; mine are very smooth and quiet, they have a nice feel.
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Only unsafe If you are functionally illiterate about quick releases or use inferior equipment.
Quick releasers are quick by design. Lawyer lips make them slow. Lawyer lips encourage functionally illiterate people to hand screw them on instead of using the cam action. This can lead to wearing out that 5mm thread on the skewer.
Gentullio Campagnolo invented the quick release a flawless piece of equipment for bicycling enthusiasts. He didn't invent the ignorant people who can't or won't follow instructions. He didn't invent the bicycling industries proclivity for making products as cheap in quality as possible.
Quick releasers are quick by design. Lawyer lips make them slow. Lawyer lips encourage functionally illiterate people to hand screw them on instead of using the cam action. This can lead to wearing out that 5mm thread on the skewer.
Gentullio Campagnolo invented the quick release a flawless piece of equipment for bicycling enthusiasts. He didn't invent the ignorant people who can't or won't follow instructions. He didn't invent the bicycling industries proclivity for making products as cheap in quality as possible.
Unless one is in an actual race where they must change a flat themselves, the time it takes to unthread a QR a few more rotations to clear the tabs is inconsequential. Yet the results of a wheel coming out of an unsecured fork has consequences. That's probably more likely what the designers had in mind. It's called risk evaluation.