Questions tagged [bolt]

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19
votes
10answers
5k 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 ...
6
votes
1answer
143 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
1answer
58 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 ...
11
votes
5answers
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, ...
6
votes
2answers
277 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 ...
4
votes
6answers
897 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
1answer
242 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
1answer
386 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
3answers
412 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
1answer
311 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
2answers
193 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 ...
1
vote
1answer
146 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 ...
2
votes
1answer
76 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
1answer
99 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 ...
4
votes
1answer
234 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 ...
1
vote
2answers
256 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). ...
3
votes
1answer
914 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 ...
1
vote
1answer
124 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 ...
1
vote
2answers
218 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 ...
2
votes
2answers
423 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
2answers
246 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
2answers
538 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 ...
3
votes
1answer
729 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?
2
votes
2answers
332 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 ...
0
votes
2answers
350 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 ...
5
votes
2answers
10k 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 ...
2
votes
1answer
3k 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 ...
0
votes
2answers
59 views

Raleigh 300 Crank Bolt specs for replacement

I have a Raleigh 300 and the crank bolt fell off and was lost. I have no idea how to find out what size crank bolt I should get! Can anyone advise?
2
votes
2answers
282 views

Not able to get crank bolt into bottom bracket spindle

I recently posted a question about changing my chainset, I was advised on this SRAM chainset which I could use which would fit my square tapered bottom bracket. I have attempted to fit the new ...
2
votes
3answers
3k 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 ...
5
votes
2answers
3k views

Is my carbon fork steerer tube damaged by overtightened stem bolts

As per the title: I've had my bike serviced by a bike shop, who helpfully tightened up the stem cap and pinch bolts on my headset. I rode it approx 15 km (9 miles) and I noticed some play in the ...
3
votes
1answer
141 views

How can I un-seize track nuts?

I bought a set of these about 18 months ago now and for a little while they continued to work as they should but then now they're seized up. Is there anything (short of ordering another pair) I can ...
5
votes
2answers
173 views

Adapter for a M5 screw for a 6mm hole

I have lost the fixtures required to attach a bike rack. The hole at the bottom of the rack has a diameter of 6 mm. It requires an adapter which sits in that 6 mm hole so that a M5 bolt fits snugly. ...
2
votes
2answers
1k views

Help! I've rounded off my bolts!

I was working on my bike and was about to add some more tension to my SLX clutch mech. While trying to remove the clutch cover I accidentally rounded off the bolts, so I have no way of getting the ...
0
votes
3answers
752 views

Replacing bolt and nut

I want to change my bolt because it is rusty. I am concerned that something bad will happen if I remove the bolt completely. Can someone please tell me if it is okay to remove this bolt completely? ...
3
votes
1answer
215 views

Can't identify this bolt. Please help. Bolt from adjustable stem

I found this bolt from my friends bike (from an adjustable stem). And I need another bolt like this for my second hand bike because it didn't come with it. It would be much appreciated if you can ...