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100 votes
Accepted

What are the conditions for removing training wheels?

Consensus seems to be more and more this: Do not use training wheels. The most important part of cycling is not the pedaling, but balancing and steering. Steering is mostly done by leaning (...
linac's user avatar
  • 2,952
60 votes
Accepted

Front tire and downtube are extremely close

Your fork is installed backwards. Loosen the stem, rotate the fork 180°, retighten the stem. You'll probably need to adjust the front brake's cable too. Some details that show the fork is installed ...
Adam Rice's user avatar
  • 30.1k
54 votes

Why do we need air-filled tires?

Is this a conspiracy of bike and wheel manufacturers, to maintain a steady demand for tubes and tires? No, because if it worked as well as you suspect, someone would have made it happen and taken all ...
whatsisname's user avatar
  • 12.2k
49 votes
Accepted

How dangerous are my worn rims?

Rims are worn out when the groove disappears. If the groove is clearly visible, well-defined and of uniform depth all the way around, the rim is not quite worn out and certainly not dangerous. New ...
Argenti Apparatus's user avatar
42 votes

Why aren't road bicycle wheels tiny?

Assuming a bicycle with a conventional rider position, the rider cannot be positioned any lower because there has to be a certain amount of clearance between the cranks and the road. As wheels shrink, ...
Argenti Apparatus's user avatar
38 votes
Accepted

What is a taco?

To taco a wheel means you've bent it so badly its a write-off and cannot be salvaged through truing. This is significantly worse than going out of true, because the rim will be creased or torn, ...
Criggie's user avatar
  • 126k
33 votes
Accepted

What's the verdict on hub-less circle bicycle wheels? Sturdy and "maintenance-free"?

Verdict seems to be 'this is a scam' Cyclotron is a scam https://cyclotronscam.boards.net/board/1/general-discussion Reevo is suspiciously similar https://www.reddit.com/r/shittykickstarters/comments/...
thelawnet's user avatar
  • 4,240
32 votes

Why do they not sell bicycles with four wheels?

Why do they not sell bicycles with four wheels? They do sell vehicles with four bicycle wheels. As Carel said, Two wheels is by definition a bicycle Three wheels is a tricycle four wheels is a ...
David D's user avatar
  • 21.9k
30 votes

Bike unstable (difficult to ride without hands on bars) after changing fork after collision

Bicycle dynamics A bicycle may only be ridden because of the peculiar steering geometry. The centre of the contact patch of the tyre is behind the point where the steering axis intersects with the ...
gschenk's user avatar
  • 9,778
30 votes

Why do we need air-filled tires?

There are two good answers here already, I'll add the relevant physics. Any suspension has three key variables: Its spring constant, i.e. how quickly the force rises as the suspension is compressed. ...
cmaster - reinstate monica's user avatar
29 votes

Making the pedals on my kid's bike rotate when I push so he'll learn to pedal

So your boy is simply sitting and not pedalling, so you push him along? Of course he's not going to pedal when he's getting a free ride from you. Stop Pushing! Firstly, does he understand how a ...
Criggie's user avatar
  • 126k
28 votes
Accepted

I have a 2nd broken spoke after 300km on a new bike, is it the wheel or me?

Not enough points to comment, so here is an answer instead, based mostly on my own experience. I've been using a bike as my main, if not sole, mean of transportation for the last 20 years or so. ...
Tahn's user avatar
  • 396
27 votes
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What is the black plastic circle on wheel axle nut?

Those look like packing pieces used to stop the axle ends from punching through the cardboard box partially assembled bikes are delivered in. I'd imaging they are being used to stop the axle nuts ...
Argenti Apparatus's user avatar
27 votes
Accepted

Purpose of 'bore' on spoke nipples - why are spoke nipples not threaded through their entire length?

Adding threads to any sort of bolt under tension doesn't actually make it much stronger, beyond the first ≈5 threads. Adding more basically just adds dead mass; either way the whole thing will ...
leftaroundabout's user avatar
26 votes
Accepted

Can’t seem to put the wheels back on the frame

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 ...
Argenti Apparatus's user avatar
26 votes
Accepted

6-bolt vs centre-lock: pros and cons?

Centerlock largely exists because since the beginning of modern disc brakes for bikes, Shimano has more or less alone had a weird cautionary take on the physics of rotor bolts theoretically being able ...
Nathan Knutson's user avatar
26 votes
Accepted

What are the risks associated with truing wheels without the aid of a truing stand?

A truing stand is a tool to speed-up the process. Using one does not stop the operator from doing it wrong. A good technique can work well enough using a finger pressing lightly on the rim and ...
Criggie's user avatar
  • 126k
25 votes
Accepted

Bent spoke design wheels — feasible?

Spokes bent like that can't take any load (tension), so it would not work. However, bending multiple spokes around each other can produce a feasible wheel with non-straight spokes, like the last photo ...
Marjan's user avatar
  • 559
24 votes
Accepted

Where is the rear wheel quick-release mechanism on my bike?

This is a standard quick release mechanism simply grab the lever indicated below and flip it the opposite direction (green arrow). At which point it should loosen up a bit, then you can spin it around ...
Nate W's user avatar
  • 9,282
24 votes

Why do they not sell bicycles with four wheels?

Trikes, particularly recumbent trikes, are relatively common and provide the kind of stability you're talking about--although they (and quads) are prone to flip in turns if you don't know how to ...
Adam Rice's user avatar
  • 30.1k
23 votes
Accepted

700c 28er - same as 29er?

As usual, Sheldon's got the answers. ISO 6221 is the unambiguous way of referring to the following rim sizes: 700c (you see this marketing on road, hybrids; this is from the French system; the c is ...
Batman's user avatar
  • 46.2k
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
23 votes

How to transport an unusable bike AND a set of wheels without a car?

"Ghost ride": Borrow a good bike (if needed). Ride on the good bike, while pulling the incomplete one alongside you by holding its stem. Your secondary hand sits on the second bike's stem ...
pateksan's user avatar
  • 2,364
22 votes

How do I fix my front wheel that’s hitting my brakes?

The return spring on the right hand caliper (from the point of view of sitting on the bike) has come out of its stop in the caliper. The spring in the left hand caliper is pulling both calipers to the ...
Argenti Apparatus's user avatar
22 votes

Cannot steer my bike with with new adult training wheels

Training wheels are for training only. You need to find a suitable flat place and do the training there. From the time my daughter had them I remember they are not suitable for actual travel over real ...
nightrider's user avatar
  • 7,879
21 votes

Adding pedals & training wheels to this balance bike?

You could probably add training wheels, but not a crank. There simply isn't anywhere on the frame for cranks to go. Also, adding training wheels to a balance bike is kind of defeating the purpose of ...
CardMechanic's user avatar
  • 2,795
21 votes

Misplaced tyre lever - alternatives?

Prevention is the best cure. I know it takes 2 tyre levers to deal with a flat on my road bike, so I carry a pair of decent ones (with some silver paint on them so they show up better by torchlight). ...
Chris H's user avatar
  • 59.9k
21 votes
Accepted

Can this rear wheel be straightened or does it need to be replaced?

That rim is dead. You need to replace the rim at least. Being Aluminium it won't straighten, it will crack if you un-bend it. If you choose to continue riding it then you may get more punctures, ...
Criggie's user avatar
  • 126k
21 votes

What's the verdict on hub-less circle bicycle wheels? Sturdy and "maintenance-free"?

I would think about these in terms of bearings: The hubless design moves the bearing of the wheel all the way out to its circumference. As such, you get extremely long racetracks a need for many ...
cmaster - reinstate monica's user avatar
21 votes

Why do modern bikes generally have two identically sized wheels?

On top of Michael's answer, that addresses the aspect of bike design: I would guess that one reason for not using different wheel sizes is also linked to logistics: there's already a huge variety of ...
Rеnаud's user avatar
  • 20.8k

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