28 votes
Accepted

Loose spokes after only a few rides

Unfortunately, most bikes are only rated to 300lbs or less. However, if this is a new bike, you should take it back to the shop and get them to fix it. They can't claim they didn't know you were a ...
22 votes
Accepted

What are the counter-intuitive surprises an amateur bike mechanic encounters, after pedals and cables?

More grease is not always better. Attracts excessive dirt and stuff. Well-greased bearings don’t spin smoothly by hand. Lots of amateur mechanics under-lubricate or use too thin of a lubricant because ...
15 votes

Reverse Gear in Bicycles

Such a hub exists for trike and quads . Pedal forward with 3 or 5 gears then having a coaster brake to stop . At full stop with the brake engaged continued backward pedal pressure will cause the cycle ...
13 votes

What are the counter-intuitive surprises an amateur bike mechanic encounters, after pedals and cables?

Anyone tinkering with bikes needs to be aware of the perverse variety of standards (how many bottom bracket standards are there now?); that multiple actual sizes can be indicated by the same nominal ...
12 votes

Broken stem tube – LBS "just" lowered handlebars. Is this safe?

Here's how I would fix the problem. This could all be done by somebody with basic tools and basic knowledge. Get a quill-threadless stem adapter and a new stem. This will allow you to fit the new ...
  • 21.5k
11 votes

Loose spokes after only a few rides

I completely agree with the accepted answer of @David Richerby from personal experience. As a heavier rider (~22 stone) for many years, I also found with a couple of different bicycles that the rear ...
10 votes
Accepted

Can I straighten bent rims between two flat surfaces?

This is not going to work. You won't permanently change the shape of the rim by just smooshing it between two concrete discs, as in order to permanently bend metal you need to exceed the yield stress ...
  • 11.9k
10 votes

Reverse Gear in Bicycles

While it may be possible, by creating a mechanism that shifts the chain from one freewheel to another, or disconnecting one temporarily through mechanical actuators, the hassle and engineering it ...
  • 9,061
10 votes

Broken stem tube – LBS "just" lowered handlebars. Is this safe?

What you have now is a bit of a hack, but it could be good temporarily so long as you don't over-stress things somehow, and if you can tolerate the lower handlebar. (Note, I haven't seen how your ...
10 votes
Accepted

Chain popped out of derailleur and wrapped around itself - how? why?

Looks fixable - take the lower jockey wheel off (3mm allen) and clean it thoroughly by scratchng the dirt off (most satisfying) and then with something liquid (hot water+dishwash or some solvent) Use ...
  • 103k
9 votes
Accepted

Replacing an FSA chainring

The main limiting factor is chainstay clearance. If your chainrings touch the chainstay it will wear and weaken and eventually fail. So the first thing is google your bike frame and see what maximum ...
  • 103k
9 votes
Accepted

Shimano Deore hydraulic brake problem

The part that popped out is one of the pistons. There should always be a bleed block in place between the pistons when bleeding the brake. Immobilizing them this way is what prevents overfill and also ...
9 votes

Pad spacer and mechanical disc brakes

No, mechanical disc brakes do not auto-compensate for pad wear like hydraulic brakes do. They will fully retract every time, pads or no pads.
  • 11.7k
9 votes
Accepted

Is buying a used bike bad if you are not expert?

I don’t think it’s a bad idea, but be prepared to repair stuff. Things even a novice should be able to check: Frame and fork without damage (i.e. no cracks or dents, nothing bent). Small paint chips ...
  • 21.1k
8 votes

Convert old road bike to comfortable commuter

That's a nice looking bike, it seems like it would be a great start for your project. The big question is whether or not the bike fits you – if it does it will be worth considering what else you could ...
  • 6,916
8 votes
Accepted

How to reassemble a completely disassembled brake caliper?

Here's a version of you picture with labels on the parts I'm probably not using the correct names but these will work for this purpose. I'm assuming you know where each part generally fits but are ...
8 votes
Accepted

Wrench to be used with a bottom bracket tool?

The tools being used there are: Bottom bracket tool Large socket to engage with the large hex head on the BB tool Sliding T-handle socket driver Some bottom bracket tools such as the Park BBT-22 ...
8 votes

Loose spokes after only a few rides

Spokes getting loose is not a laughing matter. The more spokes get loose or break, the more uneven the load is distributed to the spokes, and the more likely other spokes are to get loose or break. ...
7 votes

What are the 'parts' to a mechanical disc brake set?

It depends on how you buy the brake, so you need to check whats coming with what you're buying. Typically, you get the caliper+pads+rotor+mounting hardware and buy the brake lever (which is a V-brake ...
  • 45.6k
7 votes
Accepted

Freezing headset cups to ease installation - does this actually work?

According to this link the thermal expansion of aluminum 6061 is 13 micro inches/(inch x °F). A headset has a diameter of 1.125 inches, and circumference of 3.5325 inches. Assuming you change the ...
  • 21.5k
7 votes
Accepted

Are my cable disc brakes knackered?

Usually what causes this (literally no braking, firm lever feel, lever nowhere close to bottoming) is an error in brake setup or adjustment wherein the brake caliper's armature is being pulled to the ...
7 votes

What are cheap options for an extra set of brake levers for mechanical disk brakes?

Presumably you have drop bars. Inline brake levers are your only choice. The only places to mount extra levers on drop bars are tops. With inline levers installed you can reach levers from the drops, ...
7 votes

Stripped brake mount on fork lower

Regardless of whats wrong - a brake is a critical component of your bike and you should not take risks. If your brakes are malfunctioning, stop riding the bike until its fixed. Don't be tempted to ...
  • 103k
7 votes

What are the counter-intuitive surprises an amateur bike mechanic encounters, after pedals and cables?

In my experience, BSA and T47 cups are counterintuitive, and it is the right side cups that are left threaded, I.e. opposite to the case for pedals. Note that the original question was more broad, and ...
6 votes

Mechanical disc brakes lacking stopping power

I have TRP spyres and while I find they perform better than BB7's when properly adjusted, they are very sensitive to adjustment. They have a very narrow range between rubbing the disk and too far away ...
6 votes

Why does my chain have a single hollow pin?

Its not a master link - that's probably the one-use pin that was used to close the chain the first time. This is what a Shimano pin looks like after its been snapped off. There's a clear difference ...
  • 103k
6 votes

How can I un-seize track nuts?

I would use the same techniques as used on rusted hardware. Liberally apply a penetrating oil (liquid wrench, PB Blaster, CRC Knocker Loose). Use a penetrating oil not a lubricant to break them loose. ...
  • 18.1k
6 votes

Loose spokes after only a few rides

For your weight, you either need to find reliable wheel builder who will make wheels for you, or you need to become one. Possibly both in that order. Wheel will be most important part of your bicycle ...
6 votes
Accepted

Skipping bolts on seatpost , please help?

₹ 555 (Indian Rupees) is about $11 NZD or about $7.50 US, 5.64 UKP or 6.27 Euros. So you've got a seatpost that is incredibly cheap and likely made of low-grade metals. Zooming in a bit shows the ...
  • 103k
6 votes
Accepted

Rear Mech Too Far Forward

Using https://specializedconceptstore.co.uk/content/products/2018-roubaix-comp_12182.jpg a zoom of the mech shows that the angle of the mech is wrong. Since that is not a sprung joint like the ...
  • 103k

Only top scored, non community-wiki answers of a minimum length are eligible