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10

The little rubber tubes are for repairing Woods/Dunlop valves. The valve core does not have any valve mechanism in itself, but relies on the little rubber tube to seal. The tube fits over rounded end of the valve core shown below. Most of new tubes come with similar-looking valve that has a ball and spring mechanism instead of the rubber tube.


9

Answering as a road cyclist ... For a ride of this duration (less than a day), before starting I take notice of the conditions, and decide what to wear, in how many layers. I want to carry a spare layer to put on during stops, and in case of bad weather. Usually it'll be my lightweight wind and (so called) water proof jacket. Sometimes it's just a ...


8

As far as outside testing goes, Friction Facts is an independent company that does exactly what you ask for, testing components against each other to find out what is best, including chains in a variety of conditions (new, re-lubed, wet, dirty, etc). The top manufacturers presumably have unpublished data, considering that bikes continue to get faster and ...


8

As a completely different answer, I am sure a lot of these type of tests are done by manufacturers. The information likely remains proprietary and never sees the light of day. The job of marketing is not to disseminate scientific facts, but to convince the public to purchase item X. The business model of cycling publications is to entertain, not run ...


7

No. The only advantage of expensive chains within a specific brand is the minor reduction in weight. The ones with extra plating do look nicer and provide some corrosion resistance, but it takes almost no effort to keep your chain rust free. There are differences between various manufacturers, but in general those relate to shifting and how the quicklinks ...


6

My ideal packing includes: Tools: Hex keys to fit your bike : 2mm, 4mm, 5mm the most important, 6mm and 8mm. Some bikes use 2.5mm and 3mm. A T25 driver if you have disk brakes. Phillips and flat screwdrivers. Chain tool and a master link or two (may need to remove twisted links). Tire Levers Patches, glue, extra tubes and pump or inflator. Spare Valves, ...


6

With young children is very rare for them to have the hand strength to cause a problem with brake strength. Their hands are small and weak, giving small reach hence low level action in the brake handle. Children bikes are built using cheap components (Even the components on the best children bike rate just above BSO adult bike components) The bikes for my ...


5

A lot of the research would be hard to do if not useless. For one thing, most bicycles just don't get used all that often -- plenty of people I know will likely never wear down any of the original parts on a bicycle even if they neglect the maintenance. Moreover, even among regular cyclists, we don't have enough people who would care about such a thing. So ...


5

Everyone's going to have different list depending on how confident they are of getting assistance in an emergency or gear breakage. I do some solo rides into the forests in New Zealand. When in the forest alone I do tend to stick to 4x4 tracks where a may see one person an hour but also take jungle tracks alongside the road and very rarely see anyone. I ...


4

The little tubes are for Dunlop valves. The tube is pulled over a stem. Air pressure will push the the tube against the stem and prevent the loss of air! https://en.wikipedia.org/wiki/Valve_stem If you look at the German translation of the page you find more pictures and one of the tubes in use. This type of valve was much used in England and also in Germany ...


3

It's exactly the same thing in the automotive world. There are all kinds of studies showing you should do this and you should do that, but the vast majority of people just don't care. For example, I have no idea what kind of oil is in my car. It could be 10w30, it could be 10w40. It could be real or it could be synthetic. All I know is that there is oil in ...


3

I think the other problem with trying to both do the research, and then present it, is that there are so many ways to define the "problem" and so many valid criteria for evaluating "best" or "optimal." To use your chain example, and just off the top of my head, are we talking about: Maximizing the life of the chain, or Minimizing the time spent ...


3

Not much: A mini pump mounted on the bike, spare tube, tire leavers and the hex keys you might actually need in a Frame Bag. 1.5l of water with carbs (glucose and maltodextrin) as food. For longer rides an extra plastic bag with enough carbs for another 1.5l in the jersey. I’m usually experienced enough to pick the right clothing for several hours or a ...


3

I wrenched for a cyclocross team and those bikes see pretty torrential conditions. How are you cleaning the cables? If you're just cleaning them as they are on the bike it probably won't do much good. You need to take the housing out of its stops. How to do this: Rear derailleur: Shift your bike into the largest/inner rear cog. Now WITHOUT turning the ...


3

You have to make a distinction between the front and rear brakes. Strong rear brakes aren't dangerous, but strong front brakes (when in inexperienced hands) can cause a crash. For a bike that small, I'd go with a weaker front brake. The kid won't be going fast enough to warrant big stopping power. The rear brake isn't as important. I would leave it ...


2

The Park Tool CWP-7 is the tool for this job. Remove the outer cap using an allen key and then install the CWP-7. There is no need to tighten it ultra hard. Then use an allen key on the CWP-7 and start tightening the bolt. The extractor will "penetrate" the crank and the crank arm will start detaching itself from the other crank arm which also has the ...


2

Understand that there are several different types of torque wrenches -- simple "beam" units with a pointer indicator and a scale, "click" wrenches which emit a sound to indicate when the set torque has been achieved, "slipper" wrenches which slip when the torque has been achieved, and probably some other variations. Significant features/specs are mode of ...


2

There isn't necessarily a standard: manufacturers should provide you with the specific torques for each of their components: Specialized should give you the torque for frame screws, Shimano for derailleur and shifters, Race Face for the cranks, Hope for the brakes, etc. It is also possible that the same component has different torque recommendations if ...


2

Your cassette and possibly chainwheels are worn out. When a chain wears, the cogs wear down together with it and will not mesh correctly with a new chain. Worn cogs do not look like the teeth would be actually wearing down. Instead, the teeth get narrower and eventually develop an asymmetric "shark fin" shape. If you do not know exactly what to look for, a ...


2

I get 5000 to 10000 kilometers from mid-priced 20€ Campagnolo C9 chains. I would say this is money well spent. Of course, as other answers state, riding conditions and maintenance do effect the chain life. In my experience SRAM and KMC chains are nowhere near as durable with similar maintenance.


2

It all comes down to tolerances and cost/benefit. On a highly engineered vehicle or machine, parts are subjected to tremendous forces, very near to the maximum point of resistance a piece can withstand. Tolerances are very tight in many aspects. Forces, temperatures, etc. For those machines, cost of replacement of parts, or repair due to damage from ...


2

Q1 - Removing the damaged left cup: I think I'd do this by first removing the crank arms and the right hand cup. Then, I'd remove the axle. Once you have it all apart you can work on removing the left hand cup. Since it has a right hand thread what I think I'd do is to get an screw extractor (aka an EasyOut). You can find sets online fairly inexpensively, ...


1

Since brake cables don't rust, I think the problem is that the cable housing gets dirty with mud or any other substances. The grit inside your housing will increase the friction so the brakes become hard to pull. A way to solve this is to prevent dirt gets inside your housing by investing in good fenders. Moreover, they will help to make the bike cleaner ...


1

Well, it depends… Would you be happier cleaning a bunch of stuff out and getting a shiny new bike that reflects all you've learned? One that will "just work," or Would it be a fun project to build up a bike from scratch? Would it feel good to know that you'd "built it yourself?" Do you have the time for the project? Is it ok with you to get stuck and make ...


1

The big thing is : you have a very subjective human riding the bicycle. Even if a study shows that for X leg length you need Y crank length, if the person riding the bike think that Z cranks feel better or feel faster, what can you do? That is mostly why there is so much debate, because everybody is different. Also people want different things from their ...


1

A bicycle without a rider is not a machine, it is just a large paperweight or a piece of artwork. There are very few technical aspects that can be "objective" when the very machine itself has a greatly varying and subjective element inherent to it. Many of the other answers have touched on this issue, and that's that all bikes are not used exactly the same ...


1

So, the quick answer is to take inventory of what is wrong with the bike, and start by fixing the things that seem possible. I'd be inclined to start with the absolute basics: Make sure the brakes work. The tires hold air, and That you've got at least one gear that works. Just take it slow and fix things one at a time, aiming for a bike that you're not ...


1

The derailleur was sticking. A bit of lubrication and all was good again.


1

I found this Bikepacking Repair Kit on Pedaling Nowhere. I like the way it is broken down into components of a tool kit and spares collection. There is some good stuff in the comments section too.


1

Unfortunately it depends a lot on the specific manufacturer. I usually get around 1500 km (or more) out of SRAM and Shimano chains. I always buy the least expensive option and usually 9 speeds. (All of my bikes are 3x9 speed mountain bikes) And I ride mountain trails in muddy or otherwise very humid conditions. I clean after each ride if needed, but when ...



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