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From: Roger Merriman <roger@sarlet.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Disc's without power
Date: 30 Apr 2025 18:39:08 GMT
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cyclintom <cyclintom@yahoo.com> wrote:
> On Mon Apr 28 22:26:38 2025 Roger Merriman  wrote:
>> cyclintom <cyclintom@yahoo.com> wrote:
>>> Took the Idol into the shop on Saturday to see if Robinson can figure
>>> what is wrong with the discs. Previous disc brake bikes I built would
>>> lift the rear wheel if you put the front brake on too hard. Not only will
>>> this one not but the brakes sqeal so loudly coming to a stop that the
>>> vibration triggers the fall-off detector in the Garmin. My guess is that
>>> the actuators are misaligned vertically so that the mounts need to be
>>> refaced. There had to be some reason that I got the frameset for next to
>>> nothing. (25% of the going price) Refacing is fast and cheap if you have
>>> the Park tools for it. But they are only worthwhile for a shop to buy
>>> since all the rest of my bikes are rim brakes,.
>>> 
>> Lack of power and noise is more likely oil contamination which is disks
>> real weakness they can?t tolerate any, a misaligned calliper or dinged
>> rotor would still have plenty of power just be noisy (tends to be swish
>> than honk) and vibrate though remarkably little in my experience!
> 
> 
> 
> 
> Perhaps I misunderstand you b ut it appears that I described the symptoms
> of a problem and you said it wasn't so. If it wasn't so why would I put
> the bike in the best shop (also the most expensive)?
> 
To get a noticeable reduction in power from disks by being misaligned let
alone as significant as you said would require a massive amount of
misalignment, and frankly would bind the rotor well before that point.

Noise and lack of power are absolutely indicative of pads that are
contaminated, which is disks one real weakness, do need to be much more
careful about oils near them, unlike rim brakes.

> That is as bad as you telling me that Garmin hadn't updated their
> software after I got a notification to update it, did so, and there was a
> major change in the average speed which showed a 2 mph increase in
> average speed. It was your contention that if the version number didn't
> change, the software didn't change. In an ideal world you would be
> correct. But with people like Flunky claiming to be EE's we quite
> obviously are not in an ideal world.
> 
> 
> 
I have absolutely the same Garmin by all means find the Garmin update on
their website! You will not as like a few things you’re confabulating
stuff.

Roger Merriman