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Jun
13
comment How to carry Xtracycle by car?
Where there's a will, there's a way
Jun
11
comment Is any major manufacturer working on a 12 speed group?
I think the range is the main point. Road bikes currently have almost all the range they need with 11 speeds and a double crank. They also have the gears spaced quite closely together. Mountain bikes are a different story, as they often need a much larger range than road bikes. In this case, there could be a real advantage from more gears allowing smaller spacing between the gears, making them more similar to road bikes.
Jun
11
comment bicycle pedal design specifications for threads
@Blam Read the part in the link about "precession". The purpose of the reverse threading is to prevent the pedal from coming loose. This was an actual problem people had way back before they started using reverse threads. The pedal bearings would have to be beyond messed up for the bearings to lock up enough to cause it to unscrew. I don't think I've ever seen bearings that bad. Most pedals would have been replaced well before then.
Jun
10
comment Validity of UCI motor concerns
You can still go pretty fast even if you keep the cadence below 90 RPM, provided you are in the correct gear. This could be very useful when doing things such as climbing. It probably wouldn't help much in the final sprint where they are spinning in the top gear at high cadences. Also, the Vivax assist is probably optimized for 90 RPM and below, because that's how people will use it, but they could probably also design one that would work at 100 or 120 RPM if that was the design goal.
Jun
10
comment Validity of UCI motor concerns
I think for "mechanical doping", they'd be looking for devices such as the Vivax Assist. Which can be concealed in the seat tube, rather than quite visible hub motors. Most e-Bike motors are purposely limited to lower speeds to increase safety, but I'm sure a motor could be designed that would help a professional rider if that was the goal.
Jun
10
comment bicycle pedal design specifications for threads
@Batman I think you're right. Now that I think of it, even the lower end bikes that I've seen recently seem to have 9/16" inch pedal threads. Perhaps I'll check the pedals on my kids' bikes and get back to you on that. I was kind of just going from the information on Sheldon's site, which can (understandably) be a little dated in some areas. Also, Sheldon mentioned the now defunct "Dyna Drive" system which used must larger thread I think if you're designing a pedal or crank arm, you would pretty much cover the entire market by just going with 9/16".
Jun
10
comment Why exactly did Boardman manage a further distance than Wiggins?
I guess it depends on your flexibility. Every time I try getting really low like that, I find it helps me go faster, but my legs tire out really fast. I think this position forces you to use your muscles differently,
Jun
9
comment Why exactly did Boardman manage a further distance than Wiggins?
It's extremely uncomfortable, and it's also quite difficult to control the bike in this position. It's best used when you're the only one on a velodrome track. There's a reason stuff like this isn't allowed in competitions.
Jun
9
comment Are Hövding helmets safer than regular helmets?
Good to hear comments from an actual user. My biggest problem that I can see is that it isn't actually reusable. Neither are regular bike helmets, but I've have fallen 4 or 5 times in my time cycling, and only once have the actual helmet come in contact with the ground. And even that time it was an ever-so-slight contact that I didn't feel the need to replace the helmet. Replacing a $300+ helmet every time I had a fall could get kind of expensive, even if it was less than once a year. Also, it looks like it could be easily push around the back of the head if you hit it from the front.
Jun
7
comment back tire keeps going down
When putting it in water, make sure you pump it up big, like at least 1.5 times as big as it would be in the tire. Also, try squeezing the tube as you place it under the water. If you still can't find the hole, maybe just get a new tube. They aren't very expensive. Just be sure to check the tire for debris that caused the existing puncture and remove it.
Jun
3
comment Do certain makes/models/types of bikes get stolen more than others?
Yeah, the professional bike thieves can get pretty nasty. Even the best locks can't stop them. I know a guy who has his stem removed and his forks stolen from a nice mountain bike. I guess there's security nuts you can get to make it harder to disassemble the stem. However, when somebody is willing to go through the trouble of disassembling the bike to steal individual parts, If you aren't careful about it, you could probably take most of the important components off a frame in under 20 minutes.
Jun
3
comment Why aren't hub/drum/roller brakes suitable for touring?
I'm not familiar with them, but I think there's a certain complexity to them that isn't welcome when touring. If something goes wrong and you're 100 miles from nowhere, it's going to be difficult to fix. With rim brakes there's very little that could go wrong, and you could always bring spare parts with you in the event that something does break. Also, I've heard of people being weary of disc brakes for the same heat and heavy loads concerns that you have with hub brakes. Most "real touring" bikes will come with cantilever or v-brakes.
Jun
2
comment Fundamental principles of tire friction for off-road biking
Speaking of downward forces, cars have the ability to generate their own downforce using wings. This means they can generate more force on the ground than can be done just with gravity. F1 cars can generate as much as 5 G's of downforce. Something like this simply isn't possible with a bicycle.
Jun
2
comment Fundamental principles of tire friction for off-road biking
One major difference between mountain bikes and car racing (assuming asphalt) is the surface that the tire has to adhere to. It doesn't matter how sticky the tire is when there is loose gravel on top of hard pack dirt or wet leaves on smooth rocks. When the trail doesn't adhere to itself you're going to get very bad traction.
Jun
2
comment How is Sir Bradley Wiggins 3D printing his titanium handlebars?
The real question has to ask is "Why?" What advantages does a titanium handlebar offer? According to the article, the bars are custom fit to his arms, but I think that could have been achieved with more traditional methods. I think the 3D printing is more to draw attention to his effort than to actually provide any real advantage. Interesting that it looks like they've relaxed the rules a bit on what types of bikes are allowed for the hour record.
May
31
comment Adjustable stem issue
I had a similar stem and it was fine when I bought it. as soon as I tried to adjust it, it started to wobble, and I never did get it right. I rode it for a year like that. Eventually I ended up getting a solid stem because I felt it was unsafe with the wobble, even though I never really had an actual problem other than a slight wobble.
May
28
comment Frame manufacturer?
Without any identifying markings like a head tube badge it's very difficult to identify a frame as many are made overseas. Even bikes from different brands with use identical frames with a different paint job. It looks like a pretty basic hybrid frame. Is there any reason you want to identify it?
May
27
comment Pros and cons of single-sided forks (Cannondale Lefty)?
Your body, as well as the handlebars, cranks (counting pedals), and possibly rear triangle are still going to be wider than even a double sided fork. So I'm not sure what advantage is offered in "width" by not having one of the forks.
May
26
comment new chain skipping
You should be able to tell if your cassette is too worn from a visual inspection. If you teeth are pointy then they worn too much. Take a look at this image. The teeth on the cog below the chain are worn from excessive riding in one gear, while the rest of the cogs seem to be in pretty good condition. As @DanielRHicks mentioned, you can take it to a bike shop to measure if you aren't sure, but if it's at the point shown in the picture, it's definitely time for a new one.
May
25
comment Help for a 169 mile bike ride
I don't even know how going only 10 miles a day would work in reality. Where would you even sleep? You most likely want to be in a place with a hotel or designated camping area every night. Sure you could just duck into the bush and pitch a tent, but that seems like it might not be the best idea. You'd have to have a very good route planned, because depending on where you go, it could be 40 miles between places you could buy food. Packing 4 days worth of food and water (although purifier or chlorine tablets may be an option) would make for quite a bit of extra baggage.