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58 votes
Accepted

What is the difference between I.S., post, and flat mount disc brake mounting standards?

IS mounts (also frequently called IS tabs, disc tabs, etc) are unthreaded 6mm eyelets 51mm apart that bolts run through parallel with the hub axle. In almost all cases the brake caliper is then bolted ...
Nathan Knutson's user avatar
45 votes

Why are male and female model bicycles different in the between-legs part?

A triangle (i.e. a frame with a real top tube) is much stronger. As far as I’m aware the reason for women’s bikes is historical: Dresses and skirts. If you can, get a “men’s” bike with a real top tube....
Michael's user avatar
  • 27.4k
36 votes

Why are there no adult balance bikes?

The "balance bike for adults" did actually exist, and was known as dandy-horse, draisine or laufmaschine. It went out of fashion immediately when pedals were invented. According to Wikipedia,...
ojs's user avatar
  • 22.1k
30 votes

Why are male and female model bicycles different in the between-legs part?

Hmm, no responses from women who have actually owned a girl's/women's bike. As other answers have noted, the lowered top tube is to accommodate a skirt, and it's not because it's less revealing, it's ...
Elizabeth Henning's user avatar
29 votes
Accepted

Why are most bicycle gears designed to have so much overlap

Having an overlap between the ratio ranges available with each chainring means you don't have to use your front derailleur as much. Based on your understanding and expectations of the terrain and ...
Emyr's user avatar
  • 3,896
25 votes

Why are male and female model bicycles different in the between-legs part?

You are mostly looking at it the wrong the way round. The "male" frame geometry does not have an "inconvenient" top tube added. Rather, the "female" frame geometry has ...
Jörg W Mittag's user avatar
23 votes
Accepted

What is an asymmetric wheel and why would you use it?

The "asymmetric wheel" terminology is a little misleading. This particular wheel has an asymmetric rim. Any bike with a rear derailer setup will have an asymmetric rear wheel, because the gears take ...
freiheit's user avatar
  • 19k
22 votes

Why are most bicycle gears designed to have so much overlap

The ratios aren't spaced out consistently Actually, if you look at your diagram and exclude the smallest and largest cog on the cassette, the gears are more or less evenly spaced. What unevenness ...
David Richerby's user avatar
18 votes

Rear wheels are dished. Why not "dish" the frame instead?

A reason I would see is related to the cranks: a dished frame would require to have a chainring further from the center of the bike, which can be a problem from ergonomic and structural points of view....
Rеnаud's user avatar
  • 20.4k
17 votes

What freewheel mechanism designs are used in bicycles?

Standard Pawl and Ratchet Design This design is by far the most common on bicycle freehubs, and as such the least expensive to employ. Mechanism In it's simplest form, this design consists of a ...
Paul's user avatar
  • 1,981
15 votes
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Why are there no adult balance bikes?

I tried using my regular MTB as a balance bike for a while, in order to show my kid how to use his. After about 20 minutes I started feeling pain in my feet soles as a result of hammering my feet into ...
Jahaziel's user avatar
  • 12.5k
15 votes

Why are male and female model bicycles different in the between-legs part?

Just an opinion here. I always assumed this has nothing to do with bashing of sensitive parts against the frame as mentioned in some comments above. It has more to do with getting off and on the bike. ...
Art Gertner's user avatar
  • 2,597
13 votes
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Feasibility of bike frame design by a layperson

Interesting question and way of looking at it. Here's my take: those in the bike world who would seem most qualified to design scientifically optimal frames, which involves both mastery of all the ...
Nathan Knutson's user avatar
12 votes

What freewheel mechanism designs are used in bicycles?

American Classic Cam Plate Design The full name is "Six Pawl Cam Actuated Engagement System." This design is one of the more complicated ones, but according to American Classic provides a ...
Paul's user avatar
  • 1,981
12 votes

Is there any advantage to using brakes the UK style?

Most people are right-handed, and having the more important brake in the better hand makes things a little easier. This isn't about strength but modulation; the front has more stopping power but ...
Chris H's user avatar
  • 59k
11 votes

What freewheel mechanism designs are used in bicycles?

Star Ratchet and variations This design in it's simplest form is used by DT Swiss. This design incorporates easily replaceable ratchet plates that offer the added benefit of every engagement point ...
Paul's user avatar
  • 1,981
11 votes
Accepted

Are folding handlebars a good idea from an engineering standpoint?

Well, from an engineering standpoint, no. It increases complexity, cost and weight. Those might be a deal breaker for the commuters who would likely use them. From a practical standpoint, maybe. @...
renesis's user avatar
  • 1,401
10 votes

Does anyone manufacture a seatless bicycle?

You can get a trials bike. They often do not have a saddle or seatpost, by design. They are meant for doing tricks, jumps, balancing, etc. This doesn't sound like what you are doing but if you must ...
ebrohman's user avatar
  • 5,508
10 votes

Does anyone manufacture a seatless bicycle?

Most trials bicycles are designed without a seat. However, they are likely to be uncomfortable when ridden for long distances. You may want to consider what what you mean by "stay fit". Fitness ...
Deleted User's user avatar
  • 9,978
10 votes
Accepted

What is the function of these 'bulges' on the frame?

My best guess is that you have a frame made of Gilco Design Columbus tubing used on Italian bikes in the 80s. I could find no mention of Oberriet bike brand anywhere. Maybe a small custom frame ...
David D's user avatar
  • 21.3k
10 votes
Accepted

Why do coil suspension forks have coils placed inside the stanchions, when the rear shocks place it exernally?

Attributes of telescopic forks: A fork is a structural part that takes all of the front wheel’s loads. Its stiffness is greatly linked to its stanchion diameter. (Second moment of area vs stiffness ...
MaplePanda's user avatar
  • 15.6k
9 votes
Accepted

Why do track bikes vary between events?

Regarding handlebar selection, aero bars are only allowed in the pursuit (individual and team) and time trial events (1km TT, etc). All the other track events are drop bars only. Wheel selection is a ...
Ealhmund's user avatar
  • 2,065
9 votes

What freewheel mechanism designs are used in bicycles?

Sprag Clutch The sprag clutch has existed in industrial applications for some time: being used in motorcycles, helicopters, airplanes, automotive transmissions, and others. As far as I know, Onyx is ...
Paul's user avatar
  • 1,981
9 votes

Why are most bicycle gears designed to have so much overlap

The overlap in gear ratios that are available with each chainring is mainly a consequence of the practicalities of building a derailleur gear system. I.e., how many sprockets and what sizes can be fit ...
Argenti Apparatus's user avatar
9 votes

Why are most bicycle gears designed to have so much overlap

It used to be, back in the days of ten-speeds, that the tooth counts were carefully chosen so that one could shift a "half gear" by, say, shifting the rear two cogs to the right and shifting the front ...
Daniel R Hicks's user avatar
9 votes

Why have MTB tyres with strong front / back design disappeared?

They haven't https://www.schwalbe.com/en/mtb-reader/eddy-current-rear "FRONT: • Reliable cornering grip paired with high braking traction. • Excellent transmission of steering corrections ...
thelawnet's user avatar
  • 4,230
8 votes
Accepted

Feasibiliy of KERS for bicycles (editor: likely Kinetic Energy Recovery System)

I take it KERS is "Kinetic Energy Recovery System" which takes energy from your momentum and stores it temporarily, also offering a braking effect. With the intention to use this stored energy for ...
Criggie's user avatar
  • 124k
8 votes

What is an asymmetric wheel and why would you use it?

The wheel itself is not asymmetric, but the rim is. The reason for this is that the cassette hub itself is asymmetric, and shifting the spoke attachment at rim allows more even spoke tension. The ...
ojs's user avatar
  • 22.1k
8 votes

Why are there no adult balance bikes?

There are adult sized 'balance bikes' for sale now. But those are not to improve speed on the road or to learn to ride a bicycle but to help people with weak leg muscles to move around on walking ...
Willeke's user avatar
  • 3,991
7 votes

Does anyone manufacture a seatless bicycle?

I would be willing to guess if ridden correctly equal amounts of exercise could be made from standing up versus sitting down. However.... BOOM problem solved.
Nate W's user avatar
  • 9,262

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