Questions tagged [mechanical]

Repairs, maintenance, mechanical issues, or drivetrain parts.

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4
votes
1answer
217 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 ...
1
vote
2answers
90 views

Keeping rim brakes centered

Nice to talk to you all again. I've been refurbishing a classic women's city bike for my girlfriend (vintage French - the bike not the girl ;) it's shaping up groovy. The primary problem I'm ...
5
votes
0answers
68 views

Tool/proceedure to remove Shimano direct mount rim brake bearings (Ultegra in this case)

Looking for some advice on what tool I need/the process to remove the pivot bearings from the Shimano Ultegra direct mount rim brakes. It looks like I'll need a hook wrench(?) to get at the rear ...
7
votes
1answer
143 views

Pad spacer and mechanical disc brakes

My bike, a Trek, has Tektro mechanical disc brakes. Do I need to insert a pad spacer when the wheel is removed to prevent the brake from locking if the lever is accidentally moved?
4
votes
2answers
399 views

Shimano Deore hydraulic brake problem

I have a bike (Cannondale Quick MX) I used frequently until last fall, when I got a driving license (not my first, well out of my teens) and a car to use. The bike is 3 1/2 years old now. Since the ...
3
votes
1answer
75 views

What bike crank do I have and how can I re-attach?

So during quarantine i've picked up a hobby of bike riding. Recently while going for an afternoon bike ride I noticed one my pedals were shaking but I just ignored it. When I was finished riding I ...
5
votes
1answer
130 views

How to make sure that the brake cable anchor bolt properly holds the cable?

I am referring to the bolt, in the V-brake, that holds the cable on the opposite side of the noodle (as in this question). Yesterday I loosened that bolt to take the wheel off (I learned later that ...
2
votes
2answers
94 views

Tiagra levers moving loose

Lately I have noticed that, whenever I use the bar-end lever to shift the gears up (both front and rear) for the first couple of actions the lever feels loose: it moves to the end of its range without ...
3
votes
0answers
52 views

Can't find a “friction screw” for a friction shifting system

I recently broke one of the two speed levers ajuster (friction screw) that adjust the pressure between the levers and the cable. It's made in plastic as shown in the picture below. I would like to ...
1
vote
1answer
65 views

Front chainring issues + can I install Falcon Friction thumb shifters to an Shimano STX derailleur set?

I'm interested in trying friction shifters, also to save space on my cockpit. I bought a Mongoose Hilltopper 1994 recently and I want to play with it a little. A bike mechanic told me in order to ...
2
votes
1answer
136 views

Dent on aluminium frame?

I have a Cube Stereo 120 2018. When I was driving today a car hit me. I'm fine but the bike has a dent in it made by the car door. Can it be fixed? Can I still ride it, and go MTB? Can I make a sort ...
4
votes
2answers
167 views

Help identify fender mounting clamp?

My bike has metal fenders that attach to the frame through ~3mm steel arms that are clamped and held in place with a piece of plastic that is screwed to the frame (M5 bolts) - as shown on the photo. ...
2
votes
1answer
54 views

Stiff Shifting Levers

I was helping a friend build a bike from used ultegra 6700 components, and for some reason the shifting levers feel really stiff or difficult to shift, particularly when increasing in cable tension (...
8
votes
1answer
297 views

Is it necessary to reinforce a carbon fiber steer tube?

There seems to a belief circulating online that carbon fiber steer tubes need to be reinforced with the compression plug specifically underneath the clamp points of the stem. If this is true, why isn'...
2
votes
1answer
2k 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
2answers
2k views

Where are the bearings in thru axle hubs?

So I’ve looked all over the internet to find an anatomy picture of a thru axle hub, because I don’t understand where the bearings go, and I can’t find anything helpful. Can anyone help me understand ...
14
votes
8answers
5k views

Loose spokes after only a few rides

I have recently joined the cycling world after committing to losing weight. I am a heavy rider at about 28st (390 lbs) and have after some advice gone for a GT Avalanche. I have had the bike less than ...
2
votes
1answer
389 views

Clicking noise when cranks rotate

I've got an old `86 Raleigh fixed gear bicycle that is making a loud clicking noise when the cranks rotates. It seems to have just started doing this today. I'm looking for someone who, maybe has ...
0
votes
1answer
1k views

Chain getting stuck between large chain ring and front mech when changing into big ring

15+ year old Scott MTB. When changing gear from mid to large chain ring the chain gets pinched between the mech and the large chain ring. Tried adjusting the max min screws, problem persists. Old bike ...
3
votes
1answer
208 views

Lost power when chain is not lubricated properly

Does anybody know how much power is lost when the chain is not lubricated properly? I drive a rather heavy bike and experienced that when the chain is not lubricated it definitely has an effect. Can ...
1
vote
1answer
113 views

Mechanical disc rotor for CUBE MTB - front wheel : Shimano 559x17-21c

Seeking advice with regards to the size of disc brakes for front wheel. Cube mountain bike. Front wheel: Shimano 559x17-21c. Disc brake: Shimano brake disc sm-rt 10 Centre Lock 160mm Could you ...
1
vote
1answer
150 views

How to fix a crack in a silicone grip

I have a brand new pair of silicone grips. Somehow, one of the grips got a crack. Its mostly an aesthetic issue, as no fragments of the grip where lost. Is there any glue appropriate for silicone to ...
6
votes
3answers
913 views

Replacing an FSA chainring

I would like to replace my chainring for a bigger one. I looked up my bike specs and it comes with a FSA CK-316BT, KSS, 42T chainring. I couldn't find any information about this, so I don't know how ...
3
votes
1answer
139 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 ...
1
vote
1answer
111 views

What's that thing at the bottom of the fork steerer?

You know that slanted metal thing on the bottom of the fork steerer that can slide around? Like, the diagonal cut thing at the end that you insert into the hole when you assemble a bicycle? What is ...
2
votes
1answer
224 views

What's this part from inside the steering tube?

I wanted to replace a stem with a new one, so I first tried to screw the top cap off. What happened is that instead of the cap, the piece in the picture came out. What is the name? Is it bad that it ...
2
votes
1answer
752 views

How to change small chainring

I have a bike with a 46/36T crankset (FSA Gossamer Cross BB30) and I'd like to change the small chainring to an even smaller one. ​Googling around ​suggests that the smallest chainring I can get for ...
5
votes
2answers
243 views

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

A quick question. I want to have an extra pair of brake levers for my mechanical disk brakes set at a different position on my handlebar(s), and I want the whole upgrade to cost as little as possible. ...
3
votes
2answers
685 views

Wrench to be used with a bottom bracket tool?

It looks like a wrench with a cup at the endpoint. I was wondering what is this tool called and whether it's meant to be used by itself or in combination with a bottom bracket tool, like the PT BBT-22,...
0
votes
1answer
68 views

How to find a fitting drivetrain

I'm currently building up a new bike from a vintage Scott Windriver MTB frame. My plan is to install a Shimano Zee 10-Speed drivetrain because I don't really need more gears in my area, I want it to ...
3
votes
1answer
65 views

Rear gear change misses 1 gear

Hi I have a 9 speed setup with the derailleur that springs to the largest cog. My problem is that when I change through the gears one at time it misses 1 whole gear in the middle. It doesn't sit and "...
5
votes
1answer
104 views

Why does my chain have a single hollow pin?

I have some version of a SunRace 10-speed chain, and I'm curious as to why it seems as though each pin is a regular "non-hollow" pin, and a single one on the chain is hollow. Is this some kind of a ...
0
votes
2answers
68 views

How to configure my rear suspension

I recently bought a second hand bike, that got through quite some repairs and testing at a nearby bike store. They fixed some issues and put the bike into cycling condition, as well as changing the ...
2
votes
2answers
942 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
1answer
126 views

Bike re-assembly gear and noise issues

I had an old general purpose bike that I wanted to use exclusively with my new turbo trainer. I ended up taking it apart almost completely and of course I did not take pictures so re-assembly was a ...
5
votes
2answers
2k views

How to reassemble a completely disassembled brake caliper?

I have mechanical disk brakes in my XC bike and in the process of replacing the brake pads, I completely opened the insides of the brake caliper. There were three ball bearings and a spring attached ...
4
votes
6answers
16k views

Mechanical disc brakes lacking stopping power

I bought a carbon road bike about 4-5 months ago with Tektro Spyre dual pivot mechanical disc brakes. Love the bike except for the brakes :( Brakes are not too bad on the flat but when going ...
3
votes
2answers
2k views

Are my cable disc brakes knackered?

Well, I bought a bike called "Iron Horse" and the bike has front and rear mechanical disc brakes. The brakes, upon inspection, have no writing at all (The manufacturer was too scared to put their ...
1
vote
1answer
142 views

What's the name of the tool to bevel bar ends?

I noticed the mechanic at my LBS used a tool to smooth out and bevel the end of the steering tube after cutting it. It looks like a useful tool to smooth out the edge of bar ends as well. It's round ...
0
votes
1answer
213 views

How to fully maintain a bicycle myself? [closed]

I'm into bikes for a long time, but I still haven't got how to do maintenance of the bicycle myself so I only know how to change a tire and put some grease on the chain. I'd like to know the list of ...
1
vote
2answers
1k views

Replacing Mechanical Disk Brake cables

I am having problems with replacing brake cables on rear wheel. The bicycle has mechanical disks. I removed old cable successfully and I've put the new one in. The thing is that I feel like it's not ...
1
vote
2answers
7k views

Is it normal for a bike to skid even after both brakes are applied?

When I apply both brakes going at moderate speed, it takes a few feet before the bike stops and I can hear the rear tire skidding. The brake pad seems to be working fine since the wheels themselves ...
9
votes
5answers
3k views

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

I have asked this elsewhere on the internet as well, but this is the Stack Exchange adaptation. I have three related questions and I'll try to make it clear what they are. Here's some background where ...
3
votes
2answers
7k views

Bike brake cables popping out of brake handles

A couple days ago I got in a small bike crash and since then both my front and back brakes have this issue. As shown in the picture, the metal ends of the cables come out of the handles when I squeeze ...
1
vote
1answer
169 views

Is the ticking of a free spinning wheel related to its quality? [duplicate]

I have often noticed that, whenever a race bike is running with free wheel (so no active pedals movements), I can hear a distinct "tick tick tick tick" coming from the rear wheel, sounding more or ...
7
votes
2answers
4k views

Stuck gear hub on the way into a gear on an internal geared hub

My bike recently got stolen :( therefore I have borrowed a bike with an internal gear hub from my stepdad, which was working fine until recently when the pedals just wouldn't turn whenever I switched ...
3
votes
1answer
380 views

Inconsistent headset tightness and squeaking

I own a Trek 1.5 road bike, purchased new around June 2012. The headset (original, never replaced) has recently been experiencing some interesting issues: About 4 weeks ago, the headset began ...
2
votes
1answer
78 views

What is this ring on these bottom brackets?

Ordered a few bottom brackets; I've never seen this ring before. I can imagine its purpose, but that imagining takes me to consider that this could be problematic (bottom out before bolt is tight). So ...
2
votes
1answer
336 views

Mechanical cable-actuated disc brakes started working really badly

Currently I have a cyclocross bike with Tektro Lyra mechanical cable actuated disc brakes with 160mm wave rotors. I have had issues with the brakes for some time now, mainly my fault, I accidently ...
1
vote
1answer
1k views

Unable To Adjust Mechanical Disc Brakes Properly

I have a very puzzling problem with the front mechanical disc brakes on a big-box retailer mountain bike. Nothing fancy, and it used to work well for over a year but since I last dismantled it to ...