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Search: Posts Made By: Andrew R Stewart
Forum: Bicycle Mechanics 07-21-16, 09:07 PM
Replies: 19
Views: 1,067
Posted By Andrew R Stewart
Loose ball cups can crack around the ball track...

Loose ball cups can crack around the ball track after many miles of abuse, and an incorrectly adjusted Bb is abuse. The ones I usually see can be unthreaded from the shell with standard cup tools....
Forum: Bicycle Mechanics 07-21-16, 07:26 AM
Replies: 15
Views: 356
Posted By Andrew R Stewart
Well then... soft pedal when shifting. Why anyone...

Well then... soft pedal when shifting. Why anyone thinks that shifting under duress is both the right way and should work flawlessly is lost on me.


Ramps, lift pins and shift gates are all...
Forum: Framebuilders 07-20-16, 08:25 PM
Replies: 13
Views: 432
Posted By Andrew R Stewart
Frame integrity. Triangles which are closed are...

Frame integrity. Triangles which are closed are far more stable, stiff, strong then ones that have a corner missing. Many frames don't have the seat tube connect to the shell. But these tend to be...
Forum: Bicycle Mechanics 07-20-16, 08:18 PM
Replies: 15
Views: 356
Posted By Andrew R Stewart
A few things could be in play. The c-c spacing of...

A few things could be in play. The c-c spacing of your 1984 crank could be wider then the chain you are using likes. The outer ring could have gotten "dished" so that the effective c-c is now wider...
Forum: Bicycle Mechanics 07-19-16, 06:22 PM
Replies: 9
Views: 292
Posted By Andrew R Stewart
Please understand that tire blow offs (as opposed...

Please understand that tire blow offs (as opposed to a flat where the tire deflates slowly) are far more often an issue of poor rim/tire/tube management WRT how they fit together and are properly...
Forum: Bicycle Mechanics 07-19-16, 06:19 PM
Replies: 9
Views: 292
Posted By Andrew R Stewart
To add some historical back round. Back when...

To add some historical back round. Back when mountain bikes were just beginning to sell in numbers there were still some import tariffs which listed tire sizes effected. So some brands/manufacturers...
Forum: Framebuilders 07-18-16, 08:33 PM
Replies: 8
Views: 382
Posted By Andrew R Stewart
Stability does not mean rideability. Birds are...

Stability does not mean rideability. Birds are very unstable yet the fly far better then planes designed to be very stable... I would use the term 'control" as the vital aspect effecting rideability....
Forum: Bicycle Mechanics 07-17-16, 11:30 PM
Replies: 8
Views: 246
Posted By Andrew R Stewart
Those of us who have front suspension on a bike...

Those of us who have front suspension on a bike should know that the sliding action between the fork's upper and lower requires some slop. Additionally a loose ft hub, loose stem (which might still...
Forum: Framebuilders 07-17-16, 08:30 PM
Replies: 8
Views: 382
Posted By Andrew R Stewart
Not sure steering stability is so simple, or that...

Not sure steering stability is so simple, or that gravity is the primary force at work here. I've spent a lot of time on steering geometry and stability over the years and have read a few rebuttals...
Forum: Bicycle Mechanics 07-12-16, 10:24 PM
Replies: 6
Views: 229
Posted By Andrew R Stewart
IIRC the MA40 is only a single spec. One width....

IIRC the MA40 is only a single spec. One width. One height. Maybe 20mm wide outside and 17 inside. I've dealt with tires as wide as 35 or so on this width.


There's a lot of gray area in...
Forum: Bicycle Mechanics 07-11-16, 01:57 PM
Replies: 35
Views: 570
Posted By Andrew R Stewart
So are you saying that the brakes wheel, with rim...

So are you saying that the brakes wheel, with rim braking, is not seeing a rotational force (therefore no wind up) but a radial force? That I can agree with. Andy.
Forum: Bicycle Mechanics 07-11-16, 07:27 AM
Replies: 35
Views: 570
Posted By Andrew R Stewart
I'm no engineer but I do know that the rim/tire...

I'm no engineer but I do know that the rim/tire is a continuous hoop running from the ground to the top (where rim brakes are usually found) and back to the ground again. I would suggest that braking...
Forum: Bicycle Mechanics 07-11-16, 07:13 AM
Replies: 9
Views: 297
Posted By Andrew R Stewart
Many of us in the rust belt would offer another...

Many of us in the rust belt would offer another perspective. Some of us have had our freewheels rust and tighten up/seize from a lack of protective lube and a preponderance of salted water. Lube...
Forum: Bicycle Mechanics 07-10-16, 09:34 PM
Replies: 9
Views: 344
Posted By Andrew R Stewart
+1. Andy.

+1. Andy.
Forum: Bicycle Mechanics 07-10-16, 09:29 PM
Replies: 6
Views: 310
Posted By Andrew R Stewart
A comment about bikes produced for the lowest...

A comment about bikes produced for the lowest cost (as in big box buys). Many years ago the cheap brands had Huffy as a leader. The CEO of Huffy stated that the average life mileage of a Huffy was 76...
Forum: Bicycle Mechanics 07-09-16, 05:20 PM
Replies: 12
Views: 210
Posted By Andrew R Stewart
There is/was such a device. Burley's Piccolo "kid...

There is/was such a device. Burley's Piccolo "kid back/trail a bike". It attaches to the top of a specific but commonly mounted rack. I believe that Burley says that the trailer's pivot being over...
Forum: Bicycle Mechanics 07-06-16, 12:33 PM
Replies: 14
Views: 417
Posted By Andrew R Stewart
The first thing that comes to my mind is that the...

The first thing that comes to my mind is that the frame likely has a 26tpi shell and the current cartridge BBs don't usually come in this spec. So the Bbs you tried were 24tpi. The miss match of...
Forum: Bicycle Mechanics 07-05-16, 07:56 PM
Replies: 2
Views: 144
Posted By Andrew R Stewart
It's possible that the hub shell ball race is...

It's possible that the hub shell ball race is starting to crack around the ball track. But the usual reasons are from assembly issues. Too many balls, wrong cones or ball size, failure to tighten the...
Forum: Bicycle Mechanics 07-05-16, 04:15 PM
Replies: 21
Views: 617
Posted By Andrew R Stewart
Actually the rear brake is a band brake. A drum...

Actually the rear brake is a band brake. A drum rotates within a band/strap which is fixed to the reaction arm. As the band is contracted down and onto the drum friction happens. This is a common...
Forum: Framebuilders 07-04-16, 08:34 PM
Replies: 14
Views: 743
Posted By Andrew R Stewart
Is the OP riding only tracks? 150PSI?? Of course...

Is the OP riding only tracks? 150PSI?? Of course not with a brake caliper. Once again we find design conflicts with track and road designs and use. Andy
Forum: Bicycle Mechanics 07-04-16, 02:37 PM
Replies: 22
Views: 473
Posted By Andrew R Stewart
Typically the more expensive/exclusive the item...

Typically the more expensive/exclusive the item is the more likely any failure /flaw will be talked about. So while common 1020 steel frame may have seen greater numbers of frame failures then bonded...
Forum: Bicycle Mechanics 07-02-16, 07:39 PM
Replies: 28
Views: 827
Posted By Andrew R Stewart
Might as well try to air it up. Then if it leaks...

Might as well try to air it up. Then if it leaks back down try tearing it apart. The tools are not hard to come by, shops shouldn't have tossed them out if they are smart. Parts besides the O rings...
Forum: Bicycle Mechanics 07-01-16, 03:11 PM
Replies: 13
Views: 441
Posted By Andrew R Stewart
The big issue I first think of is how would the...

The big issue I first think of is how would the modulation, and the feedback that we all use to then determine how we modulate the brakes, would work. Andy.
Forum: Bicycle Mechanics 06-29-16, 08:37 AM
Replies: 9
Views: 334
Posted By Andrew R Stewart
IDK about chemical compatibilities but I do know...

IDK about chemical compatibilities but I do know that people mix greases all the time. I have never seen a bearing "go bad" from mixed grease. Far more bearings have far too little grease in them.
...
Forum: Bicycle Mechanics 06-28-16, 05:43 PM
Replies: 6
Views: 197
Posted By Andrew R Stewart
The cable guide plate (or BB guide) to use is the...

The cable guide plate (or BB guide) to use is the one that comes with the frame/bike. It was picked to work beast at the job of guiding cables on that exact frame. How does any component company the...
Showing results 1 to 25 of 500

 
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