On 2016-07-15 12:29, jbeattie wrote:
> On Friday, July 15, 2016 at 10:16:29 AM UTC-7, Joerg wrote:
>> On 2016-07-15 09:57, jbeattie wrote:
>>> Adding to my collection of bottom bracket noise that isn't from
>>> the bottom bracket: (1) fretting axle against rear dropout with
>>> inadequately tightened QR. I had this problem on my CAAD 9, but
>>> it resulted in a distinctive click or snap. On my Roubaix, it is
>>> a persistent and loud creaking. The rear disk must really flex
>>> the QR
>>
>>
>> What? Do you have a motorcycle disc brake on there and the
>> girlfriend riding along on the luggage rack? Or too many wheelies?
>
> No, just a hydraulic rear disc -- and perhaps a QR that is on the
> shitty side and which might have used a little more adjusting when I
> changed a rear flat earlier this week (now that I think about it).
> Many of my problems are self-inflicted.
>
Last time I helped a guy fix a rear flat I was surprised that I could
almost push the QR lever with one finger.
>>
>>
>>> (no through axles on this model -- which I will get with my next
>>> disc bike). Both front and rear need to be checked regularly.
>>
>>
>> QR on the front with disc is a bad design because they put the
>> caliper in the wrong location, behind the fork instead of in front.
>> It won't come off but the expensive front fork of my MTB mount is
>> already thoroughly worn inside the left mount because of that.
>
> A through axle is a better design, that's for sure -- but QR works
> fine if it is kept tight. Moving the caliper is not the answer, ...
It is. Because that pushes the axle into the fork instead of out. It
would also result in less crud on the caliper during muddy winter rides.
Sometimes it is so bad that I spritz a good dose from my water bottle
onto it to exchange the grinding noise against a "HOOOO" noise.
> ... and
> I have seen no bikes ...
With bicycles that means nothing. That industry has a long history of
doing some things wrong.
> ... or motorcycles with front-facing calipers. ...
Motorcycles don't have a QR so it's not an issue.
> ... The
> possible wheel ejection issues were appropriately addressed with
> through axles. You murder equipment and should have through axles, as
> I have said before. Horses for courses.
>
I am not a hardcore downhiller or anything close, just a regular XC
rider. Ok, faster than others around here but not twice as fast.
Considering that pretty much all XC MTB I ever saw have QR front axles
one would expect that manufacturers would figure this out.