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Questions tagged [mechanical]

Repairs, maintenance, mechanical issues, or drivetrain parts.

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What is the hardest bike mechanics task for an amateur cyclist? [closed]

For me it is the lacing and truing the wheel. It's very challenging to get a wheel to perfect trueness. What do you think?
Ender's user avatar
  • 2,080
0 votes
0 answers
43 views

Weird noise when pedalling

I noticed a weird noise when pedalling. I had my road bike with me when traveling (airplane), and I just came back from a trip. I only had to take the wheels off when packing it. Once I assembled the ...
masterfan's user avatar
  • 121
6 votes
2 answers
178 views

How to temporarily plug hydraulic brake hoses to route them through frame without leaking fluid

Is there a way to temporarily plug and seal hydraulic disc brake hoses as well as hydraulic dropper post hoses, before installing them or removing them from a frame? The idea is to keep things tidy ...
North Krimsly's user avatar
0 votes
1 answer
383 views

Feasibility of upgrading a recent bike from a mechanical to an electronic groupset

A frequently asked question on this site is doing a significant component upgrade on a older bike. The answer is invariably that it is either infeasible, uneconomical, or both. Now that the road bike ...
Sam7919's user avatar
  • 9,268
0 votes
0 answers
67 views

Two click sound when pedaling, chain delayed engagement

Hi All! New owner of Giant Explore E+ here. Just into the first 100 miles. I noticed my bike is making a clicking sound when I start pedaling from static or freewheeling. This happens both when motor ...
rigor's user avatar
  • 1
1 vote
2 answers
123 views

How do I reattach a screw to my front wheel's V - brakes, if it has come out? [Pictures attached]

I noticed today that some ruffians had jammed my bike into my bikestand, and pushed it in so hard, that while pulling it out, one of the brake screws of the V - brakes on the front wheel broke off. I ...
Bongo Man's user avatar
  • 113
1 vote
1 answer
997 views

TEKTRO Road Bike Mechanical Disc Brakes MD-C550 Pads

About TEKTRO Road Bike Mechanical Disc Brakes MD-C550 pads I search the internet for replacement and all results shows the model: E10.11 and in the compatibility chart it does not for the MD-C550 ...
Emadness's user avatar
1 vote
1 answer
67 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 ...
Hekyeh's user avatar
  • 11
1 vote
1 answer
90 views

suddenly can't shift up?

First things first, I am not very good at mechanics, so if my question looks very inexperienced, sorry for that. I bought a road bike with shimano ultegra r8000 and after 2 years during a descend I ...
Mat's user avatar
  • 809
2 votes
1 answer
275 views

Should this bolt be tightened?

This bolt on the left side makes the derailleur move hardly or loosely on the derailleur hanger. I don't know how it should be set. Should I keep it tight or loose?
Ender's user avatar
  • 2,080
5 votes
3 answers
1k views

Stem top bolt wouldn't screw in after transport

I transported my bike via plane in a canyon shuttle 2. It was well secured and safe. To pack it up I had to unscrew the top stem bolt and unhinge the stem along with the handlebars. Once I attempted ...
Ivan's user avatar
  • 661
3 votes
2 answers
588 views

Unmounting a stuck rear derailleur

I am trying to unmount my rear derailleur. However it seems to be seized and I am unsure how to proceed. See the pictures below. The current state of the derailleur is as follows: The screw inside ...
Finn Poppinga's user avatar
10 votes
4 answers
3k views

Is it okay for my rear derailleur to be as "compressed" as this when in the lowest gear on the bike?

Recently replaced the cables on this old road bike. When indexing the cable I notice how compressed this derailleur is and the two cogs are almost touching - it certainly doesn't look right to my ...
Antonio's user avatar
  • 101
3 votes
1 answer
2k views

How do I get off my totally stuck freehub body?

My freehub body is totally stuck The only way to turn it at the moment is with a whip chain and a cassette on. I cleaned it with WD40, but that didn't help at all. Also I tried to "hammer" ...
Schwenk's user avatar
  • 396
3 votes
1 answer
501 views

Can a crankset have its chainrings' alignment notch not aligned by design?

I disassembled a Shimano FC-M442 crankset and reassembled it using its exploded view. Usually, chainrings have a special notch indicating their orientation that should align with each other as well as ...
olliebulle's user avatar
  • 4,139
5 votes
2 answers
311 views

Should a track cog's asymmetrical lock ring be installed so the flat end faces the cog?

My bike has always had a flip-flop hub installed. I recently decided I would like to try using the fixed gear side. I purchased an All-City 17T x 1/8" Track Cog and an Origin8 Standard Track Cog ...
Will Haley's user avatar
10 votes
5 answers
3k views

Infeasibility of a mechanical wind-up spring KERS (Kinetic Energy Recovery System) for bicycles

I'm curious about an explanation for why a wind-up spring KERS (Kinetic Energy Recovery System) isn't worth it for a bicycle. The system I have in mind is instead of braking the rear wheel you engage ...
Leeroy's user avatar
  • 483
1 vote
2 answers
117 views

How do I make my ATLAS BEACH X TYPE BIKE Electric and built for winter driving?

Front Wheel: 26" x 1.75 x 36H x 12G Alloy-Cruiser, Bolt-On Rear Wheel: 26" x 1.75 x 36H x 12G Alloy-Cruiser, W/Shimano Coaster Brake Front Hub: Alloy Bolt-On, Sealed, 36H x 12G x 3/8" ...
Jaymes Peters's user avatar
3 votes
1 answer
341 views

Need help reassembling bike shifter

I recently needed to change my shifter cable, and I ended up taking apart the entire shifter instead of doing it the easy way. I was able to change the cable, but couldn't put it back together again. ...
Simon Charlene's user avatar
2 votes
2 answers
130 views

Mechanic disk brake hose length for trials

I have an Avid BB5 front disk brake on my 20" trials bike, and when I bought it from a shop that claims to specialize on trials bicycles, it had a pretty long front brake hose (80 cm/30"). ...
acalabash's user avatar
1 vote
3 answers
251 views

Bianchi Bike - Help Identifying Model

I'm looking at buying a Bianchi bike, I was wondering if anyone can tell from this image the type of bike, model and year. The owner bought it 2nd hand so doesn't have much info. Any assistance would ...
shaun grima's user avatar
1 vote
1 answer
751 views

Upgrade shimano tiagra mechanical disc to tiagra hydraulic disc brakes

I currently have a Scott Speedster 20 with Tiarga 10 speed mechanical disc brakes. Is it possible to upgrade my brakes with the hydraulic version of the tiagra groupsset (by just buying these parts e....
Vaughan's user avatar
  • 13
5 votes
3 answers
1k views

How to lock a saddle clamp to stop it from loosening during riding?

I borrowed my son's bike (a simple mountain bike) and I have problems with the saddle: I pushed it as far as possible to the back (so that it tilts down as much as possible otherwise I have the ...
WoJ's user avatar
  • 1,125
3 votes
1 answer
234 views

Steering torque

What defines the steering torque? What is an average value for e.g. city bikes and downhill MTB? Is the static torque largest for returning the steering to zero position, depending on (radial) load ...
handle's user avatar
  • 301
10 votes
2 answers
785 views

What mechanical effect causes the requirement to replace 11 speed chains at 0.5% wear rather than 0.75%?

As far as I understand, the difference between 10 and 11 speed chains is in the thickness of the plates. The length and the inner width of each link remain the same. This in turn means the size/...
Andy P's user avatar
  • 18.3k
3 votes
1 answer
472 views

Direct mount derailleur movement when tightening thru axle

I've a direct mount rear derailleur and when I tighten the thru-axle the rear derailleur moves inwards towards the spokes, around 5mm. I'm getting recurring problems with gearing (I frequently take ...
nblackburn's user avatar
3 votes
2 answers
957 views

Do split frames for belt drive bikes need special screws?

I have a belt drive Cube bike, and the frame is Aluminium. The rear triangle has a split to accommodate the belt, there's a screw right above the rear sprocket, on the right side of the bike - see ...
user4520's user avatar
  • 563
19 votes
11 answers
5k views

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

Pedals It's pretty obvious that one of the two pedals needs be tightened counterclockwise, but which one? A brief reflection on the right pedal's sense of rotation (while pedaling forward) with ...
3 votes
2 answers
559 views

Cantilever brake is missing its mounting screws and washers, how do I replace them?

Context I am fixing up a BSO where the rear cantilever brake is missing. I want to keep this project green and cheap, and there is a good supply of used cantilever brakes online. But they often come ...
pateksan's user avatar
  • 2,364
4 votes
2 answers
686 views

Removing Nexus 8-speed IGH from hub shell

see update at the bottom I'm trying to remove my Nexus SG-C6001-8D from its hub shell to grease it. Sadly Shimano's documentation doesn't cover the process of extracting the internals from the hub ...
user4520's user avatar
  • 563
0 votes
3 answers
157 views

Mechanical disc brake caliper round pads 23 mm diameter

I’m trying to find round brake pads of ca. 23mm diameter. They are for a Valk bike brand sold online in Australia. There is no brand or model evident on the brake caliper or levers. Almost certainly ...
Henry S's user avatar
  • 267
12 votes
2 answers
2k views

Gates CDN - frequent belt failures

update at the bottom I ride a belt drive bike fitted with a Gates CDN front sprocket (on the crank), a CDN belt and a CDX rear sprocket. Around the 2200km/1400mi mark, the CDN belt failed and teeth ...
user4520's user avatar
  • 563
3 votes
4 answers
1k views

How to increase brake responsiveness on Microshift style STI brifters paired with mechanical disc brake

I have a set of microshift style STI brifters. They are paired to a generic brand mechanical brake set on a Kent Nazz gravel bike. I can't seem to get the brakes to be as responsive as I would like. ...
mo_maat's user avatar
  • 175
0 votes
2 answers
574 views

What is this on the cassette? (don't quite know how to describe)

So I've attached the images of this weird piece of metal "on" the smallest cog of the cassette. Can anyone advise me on what is happening here? It does not interfere with the riding as far ...
Dima's user avatar
  • 173
1 vote
2 answers
1k views

Disc rotor rubbing against pad when bike is tilted

There is a fair amount of lateral movement of the rotor between the pads in the rear wheel break calipers. I have played about trying to centre the rotor as best as I can to stop the ching noise ...
Jack Hudson's user avatar
4 votes
3 answers
2k views

Stripped brake mount on fork lower

I noticed that one of the bolts used to attach the brake to the fork is stripped and found many solutions but wanted to know if continued use will make it worse with and without repairing it. Also ...
River's user avatar
  • 91
1 vote
1 answer
131 views

Why do steerer expander plugs have nesting threads?

I'm looking at expander plugs as I work on a modification for my new build. I note that the M6 bolt that holds most of them - like the Enve on my desk - threads into a larger, internally threaded, ...
Mr73's user avatar
  • 123
4 votes
3 answers
632 views

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

Is it a bad idea to buy a used bike that is somewhat expensive ($1000 range) if you don't know much about bike mechanics? Of course you can find a checklist online of what wear/damage to look for, ...
Lightsout's user avatar
  • 1,737
0 votes
1 answer
174 views

What is the Mechanical advantage provided by mechanical disc brake caliper

I'm designing a tricycle and I wish to put mechanical disc brake calipers but I only got leverage of brake lever, I'm also searching mechanical advantage/leverage provided by mechanical brake caliper ...
Shubham Ketkale's user avatar
5 votes
1 answer
782 views

Rear Mech Too Far Forward

I recently crashed my road bike in the city on some tram tracks, a terrible experience and don't recommend. I came off the bike and the bike itself landed on its right hand side and sustained damage ...
Axemasta's user avatar
  • 323
1 vote
1 answer
2k views

Use Shimano 105 R7000 shifters for Disc brakes

I have 2 spare R7000 shifters which I used on my rim brake equipped road bike. I've upgraded to Ultegra some time ago. I also have a Tiagra gravel bike with mechanical disc brakes that uses Tiagra ...
Ivan's user avatar
  • 661
0 votes
2 answers
597 views

Rear derailleur won't go to smallest cog (road bike, MICROshift R8)

I checked, When the shifters are such that the chain should be on the smallest cog, the cable still has a slack, which I understand then it means is not a cable adjustment thing, If a very gently ...
myradio's user avatar
  • 546
10 votes
2 answers
2k views

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

During my ride yesterday, I've hit a really weird mechanical and would love to understand. So here's the situation - I'm riding along, start on a hill, stand up and push some power, suddenly hear ...
MarcinJuraszek's user avatar
1 vote
1 answer
1k views

Difference Between SRAM SX eagle chain and SRAM NX eagle chain(12 speed)?

I have a Trek X-Caliber 8 with a SRAM SX Eagle 12 speed drive train, but I only have a SRAM NX Eagle chain. What is the exact difference between the two chains, and how can I modify my chain to make ...
Baby_Boy's user avatar
  • 113
0 votes
1 answer
186 views

Looking to change from Octalink Claris to Shimano 105, will the frame be compatible with a 105 hub?

Since road bikes are sold out almost everywhere. I was thinking about upgrading my current road bike with a new group set. My current bike a Scott Speedster 50 (2015) currently has a Shimano Claris ...
AJ S.'s user avatar
  • 213
3 votes
5 answers
565 views

Roadside / Temporary fix for skipping chain

Recently I was out riding when my chain began to skip in the big ring due to heavily worn components. The situation worsened surprisingly quickly such that within a few miles I couldn't practically ...
pip's user avatar
  • 131
1 vote
1 answer
102 views

Grip shifters on wrong side

My new grip shifters were installed on the opposite sides than I'm used to. Can I easily just switch them back to what I am used to?
Frank Neufeld's user avatar
4 votes
3 answers
1k views

Dangerous feature on a new 20" wheel kids bike? EZBuild pedals

TLDR: Rather than threading a pedal directly into the crank arm this bike maker has an EZBuild feature. The pedal is threaded into a cast aluminum part at the factory that rotates around the crank ...
David D's user avatar
  • 22k
6 votes
1 answer
697 views

Ultegra 6600 right shifter lever alignment

Have a set of Ultegra 6600 SL shifters that I'd love to put to use, but encountered an oddity with the right hand (rear) outer shift lever. It appears the lever return goes too far and so as a result, ...
sjcby's user avatar
  • 61
4 votes
1 answer
426 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 ...
An Ant's user avatar
  • 322