mtb_addict

unwise. there for safety reasons.

wolfchild

That's not good...Why would you do that ??

Rick

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.

rydabent

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.

terrymorse 

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.

Rick

I have seen and dealt with striped skewer threads several times when I worked in a shop. I don't believe it is from being over torqued. It is from the opposite. A lack of proper tightening. Side to side movement of the wheel when the skewer isn't tight enough.

PeteHski

Nobody suggested you should scrap your frames. But if you have like 15 bikes, then you might as well have one with disc brakes too. Rim brakes have all but disappeared from the pro peloton and have become a niche item.
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

terrymorse 

Rim brakes have all but disappeared from the industry, not just the pro peloton.

The pro peloton rides what they are given to ride.

terrymorse 

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.

PeteHski

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.

tomato coupe

Filing off the lips is one of the first things a lot of people do to a road bike.

Rick

[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.

tomato coupe

The number of engaged threads is not going to differ between a hand-tightened QR and a properly tightened QR.

Rick

Not posted by Rick

wolfchild

I wonder how much speed they gain by grinding down those lawyer tabs ??.....most likely 0 MPH.

Rick

The hand tightened one works loose and beats up the threads.

tomato coupe

Got it ...

terrymorse 

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.

Rick

This assumption with an assuming incorrect photo is also incorrect. Clue a 90lbs coed accomplished it with Ride, Rest, Repeat

fooferdoggie 

makes me wonder why not just change over to all through axle? takes care of the safety issue and so much easier to use.

shelbyfv

^^^^ 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.

terrymorse 

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?

terrymorse 

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.

J Palmer Cass

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.

Happy Feet

Yet, knowing all this you still file them off? It's as though, if you left them on, you would be tempted to hand tighten only.

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.