The Bicycle Chain - 1896

The technological improvements in modern bikes over those of the 1890s are much less than the 120 years would suggest likely. One of the critical "ingredients" for the first "safety bicycles" was the use of a chain to connect the rear wheel to a drive shaft with pedals (rather than pedals at the center of a large front wheel). The basic structure of a bicycle chain has not changed in all that time, but I was surprised to see that there were variations - the 1896 Victor Bicycle catalog (from Overman Wheel Co.) shows a chain where the sprocket teeth are spaced further apart and engage the chain only between every other (rather than every) link.





Commercial catalogs collection. Overman Wheel Co. Victor bicycles. 1896, University of Michigan.
Available online: http://hdl.handle.net/2027/mdp.39015071455961


Perhaps the perceived advantage was that each of the sprocket teeth could be much more substantial, but the trade-off of having half as many teeth makes this seem a wash and somehow the symmetry of the chains we use today seems more efficient (and in any event, that chain won out). Would this approach mean that the pins would bend less? (That may have been a problem in those days.) And maybe the relative cost of chains was more than today so a sturdier chain for the money seemed wise. Hard to know at this distance in time.

Cheap Spokes = Bad Idea!

My impulse buy bike, a Traitor Ruben steel sort-of cyclocross sort-of urban something-or-other bike had pretty good components but the wheels were no-name (other than the name of the company, Traitor) and the spokes were these black-coated anonymous things, 32 per wheel.

Anyway, a few months ago they started popping at the nipple end on the rear wheel. First one - replace it, then another - replace it. Now after the third has blown I have given up on one-at-a-time and am having the black crap spokes cut off and having the wheel rebuilt with new DT Swiss spokes.



A drive (ok, rear) wheel of a road bike with disk brakes has to work really hard, so the spokes need to be something other than junk selected to make the bike look "cool." (Assuming someone is going to ride the bike and not just admire it.) 2,000 miles or so isn't that long for the wheel to go through, so it is poor performance for the spokes to fail already. (No, I don't wait 220 pounds or carry panniers full of bricks.)

Well, there you have it. When evaluating a bike to buy, the wheels and the spokes should meet the same quality assessment as the derailleur (let's say). A 105 or Ultegra derailleur doesn't make up for crummy spokes.

Fiddlesticks!

Steel Bike in Morning

On my commute I sometimes am lucky enough to chat with some interesting riders. Friday I came upon a young fellow riding a 1985 Fuji steel racing bike that he had "restored" and somewhat updated.

This is a similar looking Fuji from that year. (I should keep my camera in a more reachable location when riding, I guess.)

The bike was beautiful - it looked new (well, other than the design) although he had removed all the decals so I had to ask him what it was. Very nice lugged frame and fork. He had reused the original derailleurs, shifters, and even brake levers. The one concession to modern cycling was to replace the so-called 27 inch wheels with 700 size that he hand built and to put on modern Campy dual pivot brakes.

I interested to see he was riding on 32 mm tires rather than 23 or some more racing bike-typical size. Hmmm. And he reported that while he had started putting in 80 PSI he was now closer to 60 and it seemed fine, speedy enough. And he obviously finds people like me, die hards in the "tires can't be too thin and have too much PSI" camp amusing. (23 mm and 120 PSI in rear, 110 in the front is what I have. I am rethinking this.)

No Bike Parking, Please (Capitol Hill, LoC)

How not very friendly. At the Adams Building, Library of Congress, Washington DC (on Capitol Hill).

What they mean is that they don't want bicycles locked to the railing blocking the ramp for the disabled, but do they provide a bike rack close by? No. Do they indicate where the nearest LC bike rack is (about 100 yards away, out of sight, across the street)? No. And so on. So instead people have bikes locked to sign posts up and down the street. Could be done better.

And the sign itself actually takes up more of the relevant real estate than any bike ever did. Oh well!

Motor Scooter Parked as Bike

I find this hard to understand - in a parking garage protected by the US Capitol Police, the owner of this thing feels it is worth locking up his scooter at a bike rack??

Tires for Road Bike -> One on Front, Different on Back

If the weather is good (not wet, not below freezing, generally) I will commute the ten miles each way to Capitol Hill on my carbon fiber road bike rather than my steel road bike that has disk brakes.

One of the main issues I have had is with tire wear. I had Michelin ProRace2 tires and then after they were discontinued, the successor model ProRace3. They are a bit pricey, though, often listing for more than fifty bucks each.

More importantly, I haven't been happy that the ProRace tire on front wears well while the one on back wears quickly. In particular, the center of a new ProRace tire is raised in a pronounced way that I like to imagine reduces the rolling resistence but on the back this wears away in about 500 miles, leaving a flat spot instead. You can switch the tires front to back, but then the one that was in good shape on the front is quickly in same not-so-good state.

Performance has a tire from Vredestein, the
Fortezza SE Road Tire that for a while was often on sale for around 25 bucks (although now they are $34) and customers mostly seemed to have given them good reviews. I thought I would try a set of those and bought a pair - as it happened, I then got a slash ruining a not-very-old ProRace3 so now I have a Fortezza SE on the back and a ProRace3 on the front. This has worked very well - better, I think than having a Fortezza front and back. The Fortezza is a strange clincher that takes up to 160 PSI and says it needs a minimum of 110! (The ProRace3 has a max of 116 PSI.) I tried putting 140 in the back tire but the back end of the bike become too "lively" so I run with about 120 in back, 110 in front and it seems to work fine.

I can't say that I have a lot of confidence in the grippiness of this set up for high speed sharp turns, or even moderate speed ones in rainy weather, but I don't make high speed turns (much) and try not to ride this bike in the rain - problem solved. The road grip of the front tire, the ProRace3 is probably fine, but I'm a little suspicious of the Fortezza in back, but really I am not sure. I'm not testing it.

Michelin has a new tire that takes the same approach - the Michelin Pro Optimum has different characteristics for the front tire version and the back tire version:

Michelin has developed separate front and rear tires to take into account their specific requirements: The front tire carries 30% of the weight load and absorbs 100% of the braking effect. For this reason, Michelin engineers made it a priority to develop a tire with added grip, capable of providing maximum safety to users on cold, wet surfaces. The rear tire carries 70% of the weight load and absorbs 100% of the torque generated by the bike's forward motion, which affects its efficiency and wearlife. In order to achieve consistent performance, the rear tire now has a longer life, meaning that MICHELIN Pro Optimum Front and Rear tires now have comparable lifespans.

(Michelin Pro Optimum Front & Rear)

I suppose comparable tire life spans seems something to suggest as a "feature" since many folks buy the in pairs but as a goal it seems less important than simply having good riding characteristics. And it just seems unlikely - rear tires are going to wear faster, period. I'm figuring I'll go through two Fortezza tires on the rear to one ProRace3 on the front.

Mix and match - a good idea, it seems.

Capital Bikeshare's System - from France

The French language site for the company the provides "Le Système" for Capital Bikeshare. And here is the English version. They mention the recent launch of Capital Bikeshare with their equipment, noting "A total of 1,100 bikes will be spread through 114 stations." (Somehow I had missed that there are as many as 114 "stations.")

The information that Bixi is the provider of the technical approach is on the bikes themselves, giving their URL and the notice that "This product may be protected by intellectual property rights." By "product" they apparently mean more than just the bikes.


The bikes are made by a French company called Devinci. The Devinci web site does not feature their role as the builder/provider of these bicycles, but it is stamped on the bikes themselves.