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Search: Posts Made By: prathmann
Forum: Fifty Plus (50+) 08-27-16, 03:00 PM
Replies: 11
Views: 216
Posted By prathmann
Had a similar diagnosis about 35 years ago -...

Had a similar diagnosis about 35 years ago - herniated disc at L4-L5. Had sciatic pain down my left leg which sometimes got so bad I could hardly get around. Bicycling actually seemed to cause me...
Forum: Bicycle Mechanics 08-26-16, 11:23 PM
Replies: 21
Views: 435
Posted By prathmann
In general the cause of spokes loosening is that...

In general the cause of spokes loosening is that they lose tension when they are at the bottom of the wheel. Once tension is lost (or at least very low) any vibration can cause the nipple to turn...
Forum: Folding Bikes 08-26-16, 05:57 PM
Replies: 34
Views: 472
Posted By prathmann
Capreo cassettes can be modified, but the only...

Capreo cassettes can be modified, but the only 'official' ones are 9/26 9-speeds.

What's your concern about running a larger chain ring? My Pocket Rocket came with a 60t and I haven't had any...
Forum: Road Cycling 08-26-16, 05:40 PM
Replies: 10
Views: 330
Posted By prathmann
Given that choice I'd opt for the new crankset. ...

Given that choice I'd opt for the new crankset. OTOH, the last time I wore out a chain ring it was only the large one that had problems and someone was selling a new Ultegra 53t in original sealed...
Forum: Tandem Cycling 08-25-16, 11:16 PM
Replies: 17
Views: 393
Posted By prathmann
I've taken our tandem in elevators occasionally. ...

I've taken our tandem in elevators occasionally. It usually won't fit when horizontal, but many elevators are tall enough that I can hold it vertically while rolling it just on the rear wheel. The...
Forum: Road Cycling 08-25-16, 09:31 PM
Replies: 20
Views: 418
Posted By prathmann
Yes, on my touring bike that lacks the pump peg I...

Yes, on my touring bike that lacks the pump peg I securely wrapped a zip-tie around the head tube. The little nub of the zip-tie that acts as a clamp also serves perfectly as a pump peg for the...
Forum: Road Cycling 08-24-16, 10:51 PM
Replies: 252
Views: 5,614
Posted By prathmann
A link to one FEA was provided in an early page...

A link to one FEA was provided in an early page of this thread and I believe one by Jobst Brandt was also mentioned. As I wrote previously (#170) in response to 'waterlaz':
"A paper giving an FEA...
Forum: Road Cycling 08-24-16, 09:54 PM
Replies: 252
Views: 5,614
Posted By prathmann
'waterlaz' was the person who issued that...

'waterlaz' was the person who issued that challenge based on a conservation of energy argument. However, he subsequently (after some back-and-forth exchanges with me and examination of the FEA...
Forum: Northern California 08-24-16, 03:33 PM
Replies: 6
Views: 416
Posted By prathmann
I sent them a note about the closure of Palomares...

I sent them a note about the closure of Palomares at the beginning of August. They responded that they've been in discussions with the construction crew and are hopeful that the bridge will be ready...
Forum: Electronics, Lighting, & Gadgets 08-22-16, 10:13 PM
Replies: 17
Views: 516
Posted By prathmann
I wouldn't dismiss them so quickly. Had a bottle...

I wouldn't dismiss them so quickly. Had a bottle dynamo on my Bike Friday for several years and never had any issues with it. Switched over to a battery light when those became inexpensive and were...
Forum: Northern California 08-22-16, 08:58 PM
Replies: 5
Views: 231
Posted By prathmann
Our bike club used to have some local...

Our bike club used to have some local vineyard-vineyard rides a number of years ago and we'd have at least one bike with a trailer so purchases could be carried back. But now they all charge tasting...
Forum: Beach Cruisers 08-21-16, 11:26 PM
Replies: 7
Views: 348
Posted By prathmann
Agreed that as long as you're reasonably careful...

Agreed that as long as you're reasonably careful in enlarging the hole (either by drilling or using a reamer) there shouldn't be any problem. Mainly make sure the hole has a smooth edge.

The...
Forum: Road Cycling 08-21-16, 05:46 PM
Replies: 36
Views: 786
Posted By prathmann
I had the experience once on a hot, humid day in...

I had the experience once on a hot, humid day in Michigan. Rode out from Detroit to do an Ann Arbor club ride which included a short stop in Hell. On the way back I stared feeling weak and stopped...
Forum: Living Car Free 08-20-16, 09:41 PM
Replies: 7
Views: 232
Posted By prathmann
OTOH, the more commuter-oriented Capitol Corridor...

OTOH, the more commuter-oriented Capitol Corridor train (San Jose - Oakland - Sacramento - Auburn) has a pretty nice bike arrangement. Many of the cars have bike racks on the lower level near the...
Forum: Clydesdales/Athenas (200+ lb / 91+ kg) 08-20-16, 07:28 PM
Replies: 23
Views: 577
Posted By prathmann
If the rims are getting bent I'd first check...

If the rims are getting bent I'd first check whether he's making sure to have enough pressure in the tires and also if wider tires would be an option for that frame. I prefer 36-spoke wheels but 32...
Forum: Road Cycling 08-20-16, 07:11 PM
Replies: 252
Views: 5,614
Posted By prathmann
Sounds like we're in complete agreement then.

Sounds like we're in complete agreement then.
Forum: Road Cycling 08-20-16, 06:22 PM
Replies: 252
Views: 5,614
Posted By prathmann
As I said before, I thought we were interested in...

As I said before, I thought we were interested in real materials in the real world - not some fictitious material. I said that concrete doesn't compress easily - not that there is no compression at...
Forum: Road Cycling 08-20-16, 03:50 PM
Replies: 252
Views: 5,614
Posted By prathmann
We could just as well hypothesize that the spokes...

We could just as well hypothesize that the spokes are flexible but unstretchable and therefore can not store any energy. But I thought the idea was to consider the situation with real materials in...
Forum: Road Cycling 08-20-16, 01:57 PM
Replies: 252
Views: 5,614
Posted By prathmann
Total energy of the wheel does not equal the sum...

Total energy of the wheel does not equal the sum of the spoke tension energies.
Forum: Road Cycling 08-20-16, 01:53 PM
Replies: 252
Views: 5,614
Posted By prathmann
Note that the steel rod in this simpler case is...

Note that the steel rod in this simpler case is very analogous to the spokes in a wheel. Both are the elements that are supplying the preload to other elements in the system (rim in the case of the...
Forum: Road Cycling 08-20-16, 08:35 AM
Replies: 252
Views: 5,614
Posted By prathmann
It's entirely possible for the tension elements...

It's entirely possible for the tension elements in a pre-stressed structure to lose energy when a load is added.

Think of a cement block that you've drilled a hole through. You now insert a...
Forum: Commuting 08-18-16, 06:12 PM
Replies: 110
Views: 2,238
Posted By prathmann
AIRC, during part of the nationwide 55 mph period...

AIRC, during part of the nationwide 55 mph period there was a government mandate that speedometers had to be limited to 85 mph. My car from then has an analog speedometer and it pins at that speed.
Forum: Touring 08-18-16, 05:13 PM
Replies: 22
Views: 695
Posted By prathmann
It may matter a bit more with front panniers, but...

It may matter a bit more with front panniers, but my wife and I commuted for years on our tandem and our normal load was all in one front pannier and I never noticed any balance issue. For rear...
Forum: Bicycle Mechanics 08-18-16, 04:31 PM
Replies: 23
Views: 437
Posted By prathmann
You could easily combine the above with the...

You could easily combine the above with the Schlumpf 2-speed bottom bracket to get 240 distinct gear combinations. Or the Pinion gear which gives 6 ratios in the bottom bracket for 720 total gear...
Forum: Commuting 08-17-16, 09:18 PM
Replies: 34
Views: 939
Posted By prathmann
This one gets my vote. Owner had no use for the...

This one gets my vote. Owner had no use for the front wheel by itself but did want to reuse the lock for their next bike - and presumably will be careful to use it around the frame and both wheels...
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