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Questions tagged [bolt]

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14 votes
3 answers
8k views

How do I remove a severely stripped/rounded-off Allen/hex head bolt?

I need to replace my handlebar on my Trek 830. I have a spare one, but it has shifters still attached to it. I tried to remove them. However, the hex bolt on the front shifter is severely stripped! ...
1 vote
0 answers
57 views

Searching for vintage piece

I'm trying to repair my vintage gazelle impala bike and I'm missing just one piece :( Does anyone know where I can find the piece seen in the photo? It's part of the brake cable anchor bolt. Thank you!...
1 vote
2 answers
115 views

What would be the best steel to pick for bolts fastening a luggage carrier (rack)?

I'm installing a rack for a new project. The rack model I'm picking is rated for a load of 18 kg, and there are even models rated up to 27 kg! Though, racks are usually fastened to the bike using just ...
1 vote
2 answers
49 views

Handle bar stem has frozen stripped bolt

I just bought a used cruiser for 20$ The handlebars are WAY TOO LOW for me to ride it. However, I've tried everything and the bolt will not budge. Is like to enjoy my new/used bike. Any ideas how to ...
2 votes
1 answer
122 views

Any fixes for pinch bolt crimp refusing to lock in place?

My cable shifter couldn't be secured in place because the stub of the metal shifter clamp keeps sliding over the derailleur's metal surface when applying torque to the bolt. The clamp, instead of ...
3 votes
1 answer
95 views

Wheel off turbo trainer vs nut axle

I am looking at buying a wahoo kickr v5 wheel off trainer. The bike I have is a falcon grand tour. It is a 3x7 cassette which I understand well take washers to make work, no problem. The problem I am ...
1 vote
1 answer
64 views

Avanti barrel/cylinder nut replacement?

I’m pretty sure I’ve stripped the barrel/cylinder nut on my Avanti bike’s seatpost clamp. The bolt goes in but just keeps spinning around. Is it possible to remove the nut from inside the frame? Or ...
4 votes
2 answers
604 views

Sheared off kickstand bolts. Repair shop recommends drilling the chainstay, should I try the bolt extractor first?

Both bolts holding my kickstand suddenly broke off (or maybe one did first a day earlier and I overlooked). It is the aluminum frame after 6000 km. How to repair this? Is drilling and then re-...
8 votes
3 answers
35k views

Left crank keeps coming loose

Often when I go to school on my bicycle the left crank arm starts to loosen up after one or two really gentle jumps. When this happens I just tighten it with the tool I have in my backpack. It went on ...
5 votes
2 answers
740 views

Can I somehow make it possibly to attach a kids trailer to this e-bike?

So, my e-bike and trailer got stolen. I couldn't afford the same e-bike again, went for a cheaper. Thought kids seat would work. Didn't. The bike would sway so much with my kid on the back I actually ...
1 vote
1 answer
95 views

Race Face 2x Spider for Boost 64/104 BCD Bolts?

I am unable to find any info on what bolts I need to install the 104 and 64 BCD chainrings onto this spider. The spider doesn't ship with bolts and I cannot find any documentation anywhere(!) https://...
2 votes
1 answer
92 views

Small bolt for struts of mud guard - where to buy in the UK

I've got some mud guards that I'd like to fit, but I don't have the tiny bolt that attaches the struts to the bike frame. Can anyone tell me the size and where to buy them in the UK? Halfords, ...
9 votes
2 answers
2k views

Threadless handlbar stem bolts - grease, threadlock, anti-seize, or dry?

I'm reinstalling a threadless stem after cleaning and degreasing. There are two sets of bolts: the faceplate bolts that attach the handlebars to the stem and the pinch bolts that clamp the stem to the ...
3 votes
3 answers
7k views

How to remove hex crank bolt

I have been looking online for tutorials on replacing a chainring (or three) for my Scott mountain bike: https://www.thebikelist.co.uk/scott/aspect-40-2012 When trying to take off the chainset so ...
7 votes
5 answers
2k views

A small bolt/nut came off my mtn bike while washing it, can someone help me identify it?

I was washing my’12 specialized stumpjumper. When shaking it/drying it off, a screw/bolt came off and I can’t find where it belongs and don’t know what it is. It has threads inside and fits a 3mm ...
1 vote
2 answers
888 views

Less than perfect bike grease for bolts and pedals

I understand that a good grease for bike bolts is the Parktool grease. The "gel squeeze threadlocker blue" pictured below is sold at my corner hardware store for curbside pick-up. Will this do to ...
3 votes
3 answers
917 views

Which threadlock on bottle cage bolts?

The bottle cage bolts on my bike (carbon frame) tend to unscrew easily. Instead of tightening harder (I stopped at ~2Nm), which could damage the bosses in the frame, I am thinking of using threadlock ...
4 votes
2 answers
2k views

Replacing stem bolts

Rather than replace the stem on every rusty bike I come across, I want to replace some stem bolts which are rusted, cheap original ones. I know they can differ in size a bit so I would get some that ...
6 votes
2 answers
741 views

Why are bolts of brake discs using Torx sockets?

Most bolts on bikes are using hex sockets. However, there is at least one exception: the 6 bolts of brake discs, which usually have Torx sockets. What is the reason for this? Has the Torx socket a ...
13 votes
5 answers
4k views

Why are bolts on bikes so wide?

Most bolts to mount accessories and minor parts to bikes are M5. A good example are bottle cage bolts. Components are often attached by M5 and sometimes even M6 bolts (eg long bike in quill stems, ...
3 votes
2 answers
2k views

How can I find replacement part for Mongoose scooter?

My daughter broke the quick release hinge bolt (I have no idea what to call it) on her Mongoose scooter. Where can I go to find a replacement part or at a minimum, what is it called?
1 vote
1 answer
522 views

I cannot find the correct Crank Arm Bolt for my bike

Recently, when I was riding my bike, one of the crank arms fell off and I realized that the crank bolt wasn't properly adjusted when I ordered the bike, hence when it fell off, I was able to put the ...
11 votes
2 answers
2k views

What is this "padding" on screws?

I removed my rear brake caliper for the first time, and found this white soft-to-the-touch padding on the screws. What is it? It was quite difficult to remove the screws and this must have been the ...
8 votes
4 answers
1k views

Handlebar slips in quill stem clamp when going over bumps

I bought this new Kalloy quill stem, with Sakae 25.4mm handlebars as pictured below. The handlebars were purchased at an eBay auction. Here's the setup from the side I've tightened the handlebar ...
3 votes
3 answers
8k views

How to remove a stuck SRAM AXS (Dub) crankset

I wanted to remove my relatively new SRAM RED eTap AXS crankset from my bike and I'm having problems trying to loosen (meaning: being unable to) the main 8mm hex bolt on the drive side, the step shown ...
3 votes
2 answers
636 views

Remove Shimano 105 left crank arm

I'm trying to remove the left crank arm. I've previously been able to do this with a 10 mm Allen key. But as you can see, this time it's stuck. Does anybody know which tool is best for the job? I fear ...
2 votes
4 answers
849 views

How to remove this stripped brake bolt?

I recently purchased an old road bike and I am trying to restore it. One of the main problem was a rubbish brake installation by the previous owner. I tried to remove the nut and the bolt that hold ...
3 votes
1 answer
139 views

Bolt size for Sora BL-3500 flat bar brake lever

I purchased a pair of Sora BL-3500 brake levers second hand. These were sold without handlebar clamp bolts. I optimistically thought I could re-use the ones from my old mid 1990's Shimano brake ...
3 votes
1 answer
422 views

How to Remove Square Taper Chainring Bolts

I have removed my chainring from my Bicycle, but I do not know how to remove the chainring bolts I have tried using an Allen key but I cannot move it. Do I need a special tool? Here is a photo Any ...
3 votes
1 answer
691 views

Missing bolt in my brakes, how can I find a replacement?

I was braking in a downhill, the gradient was steep so I was using both brakes mostly the rear. When suddenly the rear brake shifter went totally soft. I did a full-stop using my front brake only and ...
2 votes
2 answers
304 views

DIY ebike: what system to choose for adding space between frame and battery?

So, the project is to install this 5kg battery: on this bike: This is no joke. I'm serious. Following up to this previous question, I'm going to use steel rivnuts (aluminium is really too light for ...
2 votes
1 answer
1k views

Blind rivet nuts for ebike battery on frame: aluminium or steel?

I'm planning my first installation of an ebike battery by drilling/riveting the frame (photo of the battery below), here are some details about the project: The battery weights about 5 kg. It's a ...
20 votes
10 answers
11k views

Stuck pedal, I've tried everything

I'm looking for suggestions, when basically everything has failed to remove a pedal. It's a pretty new bike (Trek 520). The drive side pedal came off fine, the non-drive side did not. I am aware that ...
7 votes
1 answer
1k views

How to remove a seized & snapped bolt and extractor from a welded titanium cage boss

I have a titanium frame with aluminium bottle cage bolts screwed into it. I tried to remove them the other day and one of them snapped off at the head. I drilled a hole through the remains and tried ...
0 votes
1 answer
113 views

seat post bolts won't fasten + spares?

got into a slight accident at home and my saddle has slid off my seat post. It looks like the rear bolt is now bent out of shape and the front bolt won't tighten at all into the nut. I wasn't sure ...
4 votes
6 answers
2k views

I stripped one of four bolts on the faceplate of my stem. Is the stem usable until the replacement arrives?

The aluminium stem on my road bike says the max torque for each of the four faceplate bolts is 6nm. So I set my calibrated torque wrench to 6nm... and one of the bolts stripped its thread. I guess “...
4 votes
1 answer
423 views

Skipping bolts on seatpost , please help?

Couple weeks back I bought this aluminium single-bolt seatpost . Now, just 20 days later, the nut that tightens the the mechanism to fasten the saddle rails to the seatpost is skipping around and not ...
4 votes
1 answer
565 views

What tool do I need for this bolt that holds the crank arm on this stationary bike?

I'm amateur and got this stationary bike. The crank arm, I think that's what it's called, fell off. I can put the bolt back (the one inside the red circle) and turn manually but can't tighten it. ...
2 votes
3 answers
2k views

What is my bicycle flange nut size?

As stated in my previous question, I am still trying to find the size of my flange nut on my seatpost. I need a new one because the old one was worned out. I bought a 3/8-16inch g/8 flange nut off of ...
1 vote
1 answer
2k views

What is the size of my seatpost clamp nut?

I have this bicycle given by me by a friend, I kept adjusting the height of the bicycle saddle for different members of my family and now the sides of the nut are rounded. The nut is used to adjust ...
1 vote
1 answer
786 views

Options for what to do if the star nut is spinning?

I've been working on getting my mirrors to sit still when riding. They screw into a rubber block that presses out against the inside of the handlebars which backs off over time. So I bought some ...
3 votes
2 answers
2k views

M9 nut for rear wheel axle?

I have been trying to find a bike shop or anywhere that still sells M9 nut which holds on the wheel hub next to the back wheel cassette for the cassette on my back wheel. I have a Vintage Sears Free ...
1 vote
2 answers
1k views

Rounded out top cap bolt

I've rounded out my top cap bolt by using a bad allen key. I've tried most solutions to removing stripped bolts but none of these have solved this issue. If I use a large adjustable wrench and place ...
3 votes
1 answer
343 views

Rear derailluer broken bolt

I am trying to figure out the right part to replace this bolt that broke. It went through the rear frame of bike into derailleur to a shimano dyna sys II unit. I believe it is a hanger bolt but the ...
1 vote
1 answer
196 views

Where can I find vintage hardware to mount a Raleigh 3 bolt chainring?

I need hardware (3 short bolts) for my Raleigh Super Course 10 speed made in Nottingham England in 1973. The bolts hold the front large chainring to the smaller chainring that the pedals are mounted ...
1 vote
2 answers
1k views

Bottle holder - aluminium or titanium bolts?

I'm a "weight-weenie" and optimize the bolts I'm using. Replacing steel with aluminium or titanium, depending of the location (to summarize: exerted forces, and dangerosity in case of breakage). ...
2 votes
2 answers
465 views

What is this bolt called?

It's part of my front axle and I need another one like this to keep the wheel on. Links to where I could buy one would be appreciated too. The bike is a fatbike with suspension. Bolt threads into ...
1 vote
2 answers
794 views

Disc brake pad release allen bolt

I have an Tektro Auriga Comp Hydraulic Disc Brake System. It's been running worry free for ~10 years. But now I need to replace the rear disk brake pads (for only the second time). However the 3mm ...
0 votes
2 answers
2k views

What to use on saddle clamp?

I'm purchasing a new seat-post as my saddle refused to stay at the same angle with my current one; it was a second hand bike (B'Twin Triban 500) with a single bolt clamp. I'm going to switch to a two ...
0 votes
2 answers
1k views

Seat clamp keeps unscrewing, what is the preferred solution?

To prevent stealing of the seat, I replaced my "fast lock" seat clamp with a model using a regular screw: The problem is that the screw keeps unscrewing, and I'm already tightening quite strong. I ...