Hot answers tagged

64

Cables: The main difference that I am aware of is the diameter of the cable. Most brake cables are 1.5 or 1.6mm in diameter. Most shift cables are 1.1 or 1.2mm, galvanized shifter cables are 1.3mm. I'm sure that there is a lot of science behind the difference but I'll leave that to someone else. One major difference in MTB vs road BRAKE cable is the ...


36

The "cement" used in tire tube patch kits (de)vulcanizes the rubber in the patch and of the tube. Which is a chemical process, usually using sulfur, where the rubbers bond and form a stronger bond than just an adhesive would do. Rubber cement is just a gooey adhesive. Usually latex with acetone and other chemicals to make it more pliant. You wouldn't want ...


28

I volunteer at a community bike shop. We take old donated bikes and fix them up for sale, so I have a lot of experience with this exact dilemma. Here are a few reasons why I will stop working on a bike I am refurbishing: Frame has worse than just surface rust: i.e. extensive pitting and / or holes. Seized parts, especially if they need replacing. Sometimes ...


26

That's not the correct skewer for the wheel. I think you likely are using the rear skewer in the font wheel. Front hubs are typically 100mm between the drop-outs, rear are 130 or 135mm (or even 145mm on some mountain bikes that have stronger through-axle designs).


25

It's safer and way easier just to buy another MissingLink (KMC's name for their master link design) of the same type (pin length) the chain came with, leaving you with an inner link that has one on either end. They're around $2US. In addition to saving the trouble of getting the pin back in there, there's also the question of the integrity of modern outer ...


22

If the bike has been hanging rather than sitting with weight on the tyres (and hence damaging the sidewalls), there is a good chance the tyres are still ok. You can check the tyres by going around and looking for hairline cracks in the rubber and feeling if the rubber is brittle/flaky. If they look ok then go ahead and inflate them and recheck the ...


21

Minimally, you want to be able to tighten all of the bolts on your bike (likely a few hex keys will do this) and an appropriate screwdriver for adjusting derailer & brake pulls. Separate from a multi-tool, a pair of tire levers are the other tool you should carry with you. I would add a chain tool to the above list after being left in a state where I ...


20

They are both types of rubber cement but not the same MSDS will tell you a lot One difference is tire uses a mainly naphtha as a solvent and the elmers does not. Park MSDS Elmers MSDS Looked up a couple other vulcanizing fluids and the commonality is the use naphtha as a solvent. According to this link naphtha is also rubber solvent. A bicycle tube ...


19

Note: this calculation makes many assumptions, so it's only useful in an 'average use case', not some sort of exact measurement. If you find better information, please post it and I'll update the answer. How many pumps you would need to fill up a tire depends on many variables. First, the volume of your inner tube, which can be approximated as a torus (...


18

I'd recommend not taking a chance you'll miss something and take it by your local bike shop. They have a tool that can correctly re-align a bent hanger...this is much more likely then the derailleur being bent. Also, the mechanics have looked at tons of bikes up close and will notice little things that you might miss. Many LBSs will do a post crash check for ...


17

It's doable although it doesn't make sense from a cost perspective. Only do it if you have an emotional investment in the bike or want a fun project that will teach you a lot about bike mechanics. To give you an idea, I bought a 1975 Peugeot UO18 Mixte (a woman's road bike, perhaps similar to your mom's) that had been stored in a barn and turned it into my ...


17

If the nuts are rounded they're stuffed. You want to remove the nuts but not damage other things, like axles. I'll assume you're talking about axle nuts, but the same ideas apply to all nuts, bolts, and even screws to some extent. So your nuts look something like this: Clean the flats up with a file. Use a medium flat file and smooth off the lumps of ...


17

Bicycles cost money to maintain. Even if you do all your own mechanic work, you still need to purchase parts. That being said, more expensive bikes are generally more expensive to maintain at the level you bought them at. By this I mean you can purchase a replacement derailleur (of roughly the same quality) for a $250 for perhaps $10 to $20. If you had ...


17

That video is of a relatively supple tire going on easy. It's pretty blasé about the difficulties that can be encountered. He does end at the valve, which is good because advice to do the contrary is one of the most parroted falsehoods in cycling, but he doesn't talk about why. There is a universal truth of difficult clincher tire mounting situations, and ...


16

From personal experience, I'd say a larger-than-usual hole in the tire could have these undesireable side-effects: The tube might get a bit exposed, and the day-to-day rolling over the hole might wear it down until the tire eventually flats out. Chemical aggresion from road grime or mud could also be involved. The fabric of the tire might get damaged to the ...


16

That's a pinhead security fastener. You should have got a key to match with the bike. Without the matching key number you can't get a replacement key either. Here's a picture of a pinhead key fom about 2010. Yours will look at bit different. The key number is under the red blob, and the pins to mate with the nut are in the silver bit on the right. As you ...


16

Looking at manufacturers site I found repair kit with 'mysterious' blue mesh listed as "Cartridge freeze protector". It is supposed to be put over the cartridge (like in this picture) to prevent skin irritation/burn because CO2 gets very cold when discharged.


16

This kind of failure is basically the reason sticker-type patches have a reputation for not being reliable. Scrupulously sanding the area and getting it as clean as possible (ie, with alcohol or other residue-free solvent, cleaner than anyone can probably get it on the side of the road) wards off the problem but doesn't eliminate it. Sticker type patches ...


15

Generally, if you are using an inner tube in the tire, you should replace the tire if there is more than a 2 millimeter cut in the tire casing. Not in the rubber, mind, but it the threaded cloth casing that your rubber bits are laid on to. I personally err on the side of replacement rather than risking a serious injury from a blow out at a bad time, so I ...


15

This article titled, How to Get the Pin Back Into a Bike Chain, will give you a step by step guide on how to put the pin back in a bike chain. Edit: I'm copying the article just in case the link ever becomes broken (no pun intended). The information below is from felixarizona.com Edit 2: I removed the content that can be found here for possible copyright ...


15

You have to remove the wheel to replace the tube. A repair can be done in the frame. On older bikes without quick release, and with current gear hubs, electric hubs, Nuvinci hubs, belts etc, you need a spanner and oftentimes, the gear adjustment goes back different and needs fiddling with. This reduces the advantage of tube changes. A fix is only 3 mins. ...


15

Using WD40 on a headset should not cause it to loosen. Something else is wrong. You need to find out what that is. First - don't ride the bicycle until the problem is identified and fixed. Doing so might be dangerous - both to you and anyone near, as you may lose control. If your bicycle has a new-style "threadless" headset, the stem bolts may be ...


15

Unless the cost of a new wheel that's suitable for you plus any other repairs the bike might need is greater than what the bike is worth to you, than the answer by far is get a new wheel. Folks in your weight range who ride a lot tend to need an especially strong and reliable aftermarket wheel. The stock advice is to get a handbuilt one. The reason for ...


14

Those notches are used when shifting gears, as you move the derailleur, the chain moves and catches on a notch and switches from one chainring to another adjusting the gearing. You do not need a replacement bicycle, this is a nice bike and with proper maintenance (keeping the drive train clean and lubed) should last a long time.


14

"Nothing is so broken you cannot make it worse" - breaking a perfectly good chain in the field, miles from nowhere, with a light weight emergency tool, would be my very last resort. This will only work if the broken end is not too frayed. Remove the cable completely from the outers and the shifter. Thread the cable though the barrel adjuster on the ...


14

That's a very hard area to patch properly (if its even possible), and I'd recommend putting a new tube in instead of trying to patch it. . I'd also check that the rim tape on the rim is intact and in good condition, cause otherwise if its busted, you're going to get another cut. Also, as pointed out by ChrisH in the comments, rough edges on the rim hole ...


14

If your question is, "Can an amateur successfully true a wheel on their first try?", the answer is "Yes". A quick search on the internet reveals plenty of videos explaining the process. Some things to consider: Make sure you fully understand the process before you start Don't use excessive force and take your time Use a spoke wrench Make small adjustments ...


14

You'll need to very carefully inspect the area around the boss that's been ripped out, as well as your usual second hand frame check. If the bike was ridden after the damage cracks could easily have spread and you might be well on the way to a two piece seat tube. This groove could be the start of a problem, but it's probably just a scar from where the cage ...


13

Like Daniel Hicks says, they are threaded opposite to each other. This ensures the act of you pedaling is constantly tightening them both. If they were both the usual right hand threads then the left pedal would eventually unscrew and fall off. So, if you're like me and use the right hand rule to constantly assess which direction you should be turning ...


13

In the near term it's reasonably safe -- the dent is not sufficiently deep to seriously weaken the tube (though one does need to be concerned about the integrity of the welds on the rest of the bike, given it's been in an accident). In the far term (10s of thousands of miles) there's danger that the tube will fatigue and become weakened at the dent. (The ...


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