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Search: Posts Made By: jsallen
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Forum: Folding Bikes
01-01-24, 09:45 AM
Replies: 1,504
Views: 450,240
Posted By jsallen

My first Twenty

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/500x500/johntwen2_230d79f2645f2b00747bb189a5587b81a4aeb9c9.jpg
Sheldon Brown took this photo of me in 1980-81 after I had first customized my...
Forum: Bicycle Mechanics
01-01-24, 08:45 AM
Replies: 71
Views: 2,988
Posted By jsallen

[QUOTE=Kontact;23112440] "I'm not suggesting...

[QUOTE=Kontact;23112440]
"I'm not suggesting all spokes that break started out with a curve, but that all spokes are of an imperfect shape. And that imperfect shape is never seen unless the tension...
Forum: Bicycle Mechanics
12-25-23, 08:57 PM
Replies: 71
Views: 2,988
Posted By jsallen

Let's look at the whole picture.

You restate the main result of the analysis made by John Forester in 1980, see https://cyclingsavvy.org//wp-content/uploads/2020/05/downward-pull1.pdf, but you have neglected the slight increase...
Forum: Bicycle Mechanics
12-24-23, 08:59 PM
Replies: 71
Views: 2,988
Posted By jsallen

Sheldon Brown once built a wheel with 72 spokes...

Sheldon Brown once built a wheel with 72 spokes for a heavy friend. It worked. Aside from that, the way to avoid spoke-hole damage is to use thinner spokes, not to use thick spokes at less than their...
Forum: Bicycle Mechanics
12-17-23, 09:48 PM
Replies: 71
Views: 2,988
Posted By jsallen

Any other consideration could be based on an...

Any other consideration could be based on an understanding of how much spoke tension can increase in normal use. This would require the analysis that I am not aware has been done. Wheels are subject...
Forum: Bicycle Mechanics
12-17-23, 08:46 PM
Replies: 71
Views: 2,988
Posted By jsallen

I wonder how this is measured. It may vary from...

I wonder how this is measured. It may vary from one manufacturer to another Iis it the maximum loads which the rim can withstand, or the recommended tension when the wheel is no under load, and if...
Forum: Bicycle Mechanics
12-17-23, 08:25 PM
Replies: 71
Views: 2,988
Posted By jsallen

Yes. And it isn't only example: it's physics. The...

Yes. And it isn't only example: it's physics. The spoking on each side must pull the rim toward its side equally, and the lower the angle, the tighter the spokes must be. Spoke gauge in proportion to...
Forum: Bicycle Mechanics
12-07-23, 09:29 AM
Replies: 71
Views: 2,988
Posted By jsallen

I suggest checking against musical pitch as...

I suggest checking against musical pitch as described at https://www.sheldonbrown.com/spoke-pitch.html. The musical pitch is independent of spoke gauge, because it depends in the same way on spoke...
Forum: Road Cycling
12-07-23, 09:14 AM
Replies: 162
Views: 8,079
Posted By jsallen

And with spoke reflectors!

First time I rode TOSRV East, around 1980, Terrible Mountain (Ludlow-Weston Vermont, southbound). Mercier 10 speed with spoke reflectors. They unbalanced the wheels so badly that the bicycle shook up...
Forum: Bicycle Mechanics
12-06-23, 10:44 PM
Replies: 15
Views: 731
Posted By jsallen

Calculating spoke length: the spokes need to be...

Calculating spoke length: the spokes need to be longer, as the holes from which they cross are farther apart. Measure spacing between more distant and closer adjacent spoke holes. Call the smaller...
Forum: Bicycle Mechanics
12-05-23, 03:12 PM
Replies: 2
Views: 523
Posted By jsallen

Yes. The thinner teeth are of no great importance...

Yes. The thinner teeth are of no great importance if you are using a single chainring. They will wear slightly faster. I have run chainrings made for derailer gearing on bicycles with internal-gear...
Forum: Bicycle Mechanics
12-05-23, 03:02 PM
Replies: 17
Views: 1,207
Posted By jsallen

The old, original S-A S5 series will fit into the...

The old, original S-A S5 series will fit into the hub shell of an AW. Some of these are reliable, others not. The overall ratio is wider than with an AW. It is important to use the right shifters....
Forum: Bicycle Mechanics
12-05-23, 02:39 PM
Replies: 43
Views: 1,739
Posted By jsallen

Ouch! Prudence dictates, replace it! The aluminum...

Ouch! Prudence dictates, replace it! The aluminum has probably been taken beyond its elastic limit. and you would have to bend it again to get a standard 1" diameter handlebar in. Stems are not...
Forum: Bicycle Mechanics
12-05-23, 02:21 PM
Replies: 8
Views: 14,593
Posted By jsallen

Both kinds of shifters will probably work with...

Both kinds of shifters will probably work with Nexus and Alfine hubs that have high-gear slack (older) or low gear slack (newer). The cable pull from step to step is mirrored. If the shifter has an...
Forum: Bicycle Mechanics
12-05-23, 02:05 PM
Replies: 11
Views: 537
Posted By jsallen

The important part of the chain to clean and...

The important part of the chain to clean and relubricate is inside. Wiping dirt off the outside only makes it look better and can push grit inside.
Forum: Classic & Vintage
03-31-12, 11:13 PM
Replies: 1
Views: 418
Posted By jsallen

bike sharing

Is "bike sharing" the American Way? Read about it here! http://sheldonbrown.com/bike-share.html
Forum: Bicycle Mechanics
03-31-12, 11:10 PM
Replies: 8
Views: 596
Posted By jsallen

Bike aharing...

Is "bike sharing" the American Way? Read about it here! http://sheldonbrown.com/bike-share.html
Forum: General Cycling Discussion
03-31-12, 11:08 PM
Replies: 0
Views: 454
Posted By jsallen

SBC American Way bicycles

Is "bike sharing" the American Way? Read about it here! http://sheldonbrown.com/bike-share.html
Forum: Classic & Vintage
11-09-09, 09:40 AM
Replies: 111
Views: 13,780
Posted By jsallen

Astra was a Motobecane off-brand, to get around...

Astra was a Motobecane off-brand, to get around some distribution rights issue IIRC. The bike looks very much like my Motobecane Grand Record, also a rescued bike. Note that the Reynolds sticker...
Forum: General Cycling Discussion
07-21-09, 09:24 PM
Replies: 0
Views: 442
Posted By jsallen

Sheldon Brown bicycle on eBay

Sheldon Brown's unique Bianchi BaSS bicycle with a 9-speed SRAM i-Motion hub is for sale on eBay --

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150359188082

Bidding ends July 25...
Showing results 1 to 20 of 20


 
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