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Bike repair put a 700-20 tire on my 700-25 road bike, should I replace it?

I had a flat tire in my rear wheel, so I took my road bike to the repair shop. They had to replace both the inner tube and the tire. After using it for 2-3 times. (mostly just going in to the gym or ...
hboogie's user avatar
  • 11
2 votes
0 answers
36 views

How to diagnose and fix a mechanical disc brake rotor that is bent without a tool

I have a 2022 GT Aggressor with mechanical disc brake rubbing on the rear wheel. I tried realignment of the caliper several times and I got the wheel trued. But my brakes still rub ALOT! There is only ...
Alison's user avatar
  • 1,143
3 votes
1 answer
65 views

Correct way of centering rear wheel with differential spoke lengths

I'm rebuilding a rear wheel with brass nipples after some aluminum nipples have failed. I have troubles centering the wheel. The spokes are 260/266 mm DS/NDS long. The recommended spoke tension is 100 ...
sebastian's user avatar
  • 205
7 votes
2 answers
980 views

When I am pedaling harder on a slope, the chain sometimes skips or get detached

When I am pedaling harder on a slope, the chain sometimes skips or gets detached from the front chainring. I have several videos shot with high speed camera in order to record what was wrong here: ...
kile's user avatar
  • 171
2 votes
2 answers
512 views

Is there still production of manual gearbox bicycles?

I have found the 1930s Gearbox Bike - Restoration video on Youtube. This is a 1930's bicycle which was manufactured with a gearbox that you can shift like the one on a motorbike or a car, though there ...
Christmas Snow's user avatar
2 votes
1 answer
201 views

I think my MTB chain is modified ( shortened )

I have a 2x9 crank and cassette system. And I can't get it to go on the last cog because my rear derailer is maxed out. I bought a used and altered MTB and I can see the chain is short. So typically ...
Brian's user avatar
  • 21
4 votes
0 answers
35 views

Giant Crest fork NEGATIVE pressure

my child runs a Giant Crest 34 RCL, that is newish (couple months old,) and has been fine for the past few weeks that they have ridden. They run about 60PSI, and testing the rebound makes no ...
Hman66's user avatar
  • 41
0 votes
2 answers
69 views

How to upgrade Scale 930 to reduce weight and gain speed?

I need to upgrade Scott Scale 930 (2022) with the following properties: fork: FOX 32 Float Rhythm Grip 3 (100mm travel) bottom bracket: Shimano BB-MT500 / shell 41x92mm rear derailleur: Shimano XT RD-...
Politechniczny's user avatar
1 vote
0 answers
71 views

How do you put a usable brake on a bike trailer?

How are you able to brake when on a bike trailer? I am making a bike trailer and need some tips on how to make it.
timmy's user avatar
  • 11
0 votes
2 answers
1k views

Should a 10 speed shifter only click 9 times?

The LTwoo shifter I bought (the elite version of the a7) is a 10 speed but only clicks 9 times. Should it be 10 clicks?
Jpez's user avatar
  • 25
0 votes
1 answer
81 views

Why a single fixed gear opposite a freewheel gear on same axle [duplicate]

.I have a single speed bike with a single fixed gear on the opposite side of the same axle. What is the fixed gear used for? +
M M's user avatar
  • 3
3 votes
1 answer
228 views

Moving rear sprocket outward

I'm trying to fit a Veer Split Belt to my old city bike. However, I have noticed that the front and rear sprockets are not well aligned. I can't move the front sprocket inwards, so the only way to ...
Stücke's user avatar
  • 1,446
5 votes
2 answers
562 views

How to measure q-factor?

I was checking the specs of my crankset (Deore FC-M610) on Shimano's website and I saw that its q-factor was 176mm. I suppose this is the distance between your two feet when you are standing or ...
Ender's user avatar
  • 1,950
2 votes
1 answer
80 views

Why do brake cables come out of barrel adjuster when they are loose?

My brake cable got unattached from the pinch bolt and came loose. I then noticed that at the other end the cable housing was not inside the barrel adjuster anymore. I thought something broke at the ...
gtz's user avatar
  • 21
0 votes
0 answers
26 views

Help identifying this Freeagent bike?

so I’m considering the purchase of this bike but all the information about it provided is that it is a Freeagent bike. There are asking $150 and depending on the model/year that may or may not be a ...
Jessop Scofield's user avatar
1 vote
1 answer
51 views

bottom bracket axle length, chainline and crank compatibility

TLDR: How much leeway there is, if any, in selecting the bottom bracket axle length for octalink or square taper cranks in order to reduce chainline? Background: I'm doing some minor modifications to ...
stativ's user avatar
  • 113
1 vote
1 answer
44 views

Bearing size for front hub

This is my first time posting, so apologies if I did something incorrectly. I recently bought a used Marin Bobcat Trail 3 mountain bike and noticed the front hub was really tight. After removing the ...
Matt's user avatar
  • 11
5 votes
1 answer
797 views

Is a new Tourney rear hub better than a 15 year old Deore hub?

I have an old MTB with Deore M530 rear hub. I found out its axle has a slight bend thanks to the help of the members here. There is also wear on one of the cones. I am going to order an axle set (axle ...
Ender's user avatar
  • 1,950
1 vote
1 answer
124 views

Are Tiagra BR-4600 brake pads compatible with 105 BR-5810 calipers?

Tiagra pads are about half the price of 105 pads. I wonder what is the difference and if they are compatible with the 105 brake calipers at all.
Ender's user avatar
  • 1,950
2 votes
0 answers
28 views

Square taper with 15.5mm end?

I got a Star Trac NXT for £15 for some indoor fitness but it's missing its left crank arm. I thought to myself oh I'll just throw on a standard steel crank arm and I'll be good to go BUT it doesn't ...
Rudolf Bohmer's user avatar
0 votes
2 answers
42 views

brake rotor offset inconsistency

I previously ran a promax 160mm rotor with a BB7 avid brake caliper. My rotor is spent and is not braking correctly. The tech suggested I used a Shimano ice-tech disk. It seems to me that, relative to ...
AdamO's user avatar
  • 355
1 vote
1 answer
65 views

Brake problems (need adjustment too often)

I've been having problems with my bicycle brakes for not a short time and I've been having it with a couple different bikes. The brakes get loose after 1-2 weeks. I deliver with my bike so I use it 50-...
Artin's user avatar
  • 11
0 votes
0 answers
43 views

Standards in e-bike electrics

The research I've undertaken seems to lead to this statement, "There are no standards in e-bike controller wiring", it's a free for all! My question is: Is there any organization pushing for ...
AndrewB's user avatar
5 votes
4 answers
888 views

E-bike battery placement on the seat tube

when reading articles about location of battery placement on e-bikes, i don't seem to find seat tube being discussed anywhere. This is however exactly where Ecoride, a Swedish e-bike brand, places ...
InternazionalIV's user avatar
2 votes
1 answer
98 views

Wheel truing question

I'm trying to true the rear wheel of my 26" MTB but couldn't make any improvement so far. I don't have a truing stand so I am turning the bike upside down and when I look from above I just ...
Ender's user avatar
  • 1,950
3 votes
0 answers
42 views

How to tighten security screw with H pattern on bike seat?

My bike seat has a bolt connecting it to the seatpost, which has come loose. The bolt on the underside of the seat is standard and can be turned with a hex wrench, but it's connected to what I believe ...
Drew's user avatar
  • 131
5 votes
2 answers
946 views

Wheel scratched carbon on ride

Wheel scratched carbon seat tube Hi everyone, Recently my wheel scratched my carbon seat tube as it loosened at the end of my ride. Was wondering if it is safe to ride. Imgur has 4 images, 2 are below ...
xigoL's user avatar
  • 51
-1 votes
0 answers
30 views

Value of my vintage Dyno [closed]

The serial number on my bmx Dyno is 2671. Which I found was made in 9/85. What would the value of the bike be. I’ve tried looking it up and I’m unable to find anything.
JJM's user avatar
  • 1
5 votes
1 answer
98 views

FSA Mega Exo 24 threaded shell BB turns free when off the bike, but turns rough and gritty once installed

My FSA Mega Exo BB is about 2 years old and came on the bike when I bought it new. The right-side bearing is fine. However, the left-side bearing is gritty and resistant when installed in the frame, ...
Darren C.'s user avatar
  • 153
1 vote
0 answers
20 views

Where to find all Brompton literature (Manual, Schematics, etc)?

Where can I find the online library where I can download all of the public literature published for the Brompton bicycle? Yet again, something unscrewed and fell off my Brompton bicycle when on a tour ...
Michael Altfield's user avatar
1 vote
2 answers
81 views

Does attaching a trailer to a dropper post damage it?

I would like to purchase a trailer for my new bike. It is a Canyon Spectral:ON CF7 with a dropper post/telescopic saddle. My goal is to go shopping for groceries with my bike. Now, I had a trailer for ...
eckh_ma's user avatar
  • 13
6 votes
2 answers
405 views

How do I attach this master link on the chain?

This is a master link with PYC brand. I couldn't figure out how to attach it on my chain as both pins are on the same side. Can you help me out? Also can you tell me for which speed this master link ...
Ender's user avatar
  • 1,950
3 votes
4 answers
75 views

Looking for a brake cable cap larger than standard size

Does anybody know what kind of brake cable end cap I need for this larger than standard size socket? I used a brake cable adjuster as a temporary solution.
Ender's user avatar
  • 1,950
0 votes
1 answer
37 views

Dropper Post on Marlin 7 Gen 2 (2021)

I am looking to install a dropper post on my Trek Marlin 7 Gen 2 (2021) size XL. I am thinking I want to get a PNW Cascade 150mm. When I went to measure the seatpost to make sure, it stopped before ...
Thumbdrive's user avatar
-1 votes
0 answers
34 views

All I know is serial number [closed]

So the serial could be TO1Q3030917, or T010303917 Obviously Orbea, has the 7005 aluminum sticker, 7 speed shimano c101 downshifter, the meters are also shimano, Does any recognise the model? I tried ...
JP gee's user avatar
  • 1
0 votes
0 answers
21 views

Confused about tire leakage, valve not attached

I’ve gotten a second hand mountain bicycle (felt brand), now the back tire is leaking air and is unusable. First, I thought that the tube was burst and would need replacing. But now I am just confused ...
Felt_mountain's user avatar
7 votes
1 answer
417 views

How can I keep my brakes centered?

If I move the brake device by hand, I can get it centered. However, after riding a bit I guess the bumps of the road shift it either to the right or left, causing either the right or left brake pad to ...
John's user avatar
  • 227
1 vote
1 answer
31 views

Are there two types of RD-TY-300 - for standard and direct hangers?

I have a MTB with a mashed up Tourney RD-TY-300, due to a badly rusted chain. I might be able to bend it back into alignment, but seems unlikely, or would require a lot of work and finesse that I don'...
Greenonline's user avatar
1 vote
1 answer
49 views

Clunk/Knock noise when pedaling

I recently bought a new mountain bike and when I pedal, sometimes (almost randomly) I will hear a clunk or a knock come from the bike. It usually only happens once or twice, but I worry because it ...
Tinyisaiah's user avatar
1 vote
0 answers
54 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!...
Sophie's user avatar
  • 11
0 votes
0 answers
53 views

Carbon seatpost stuck due to damaged grub screw

I have an Orbea Orca 2024 with Di2 and the grub screw for adjusting seat height has potential thread damage and it won't come out. The bike mechanic explained that the reason the grub screw went so ...
Lalit Chilka's user avatar
1 vote
1 answer
47 views

I can't unscrew the rotor bolts

I have a torx screwdriver but it wasn't meant for bike maintenance use. Actually I had bought it to unscrew the bolts of my owen. However, it sits firmly on the bolts of the rotor but can't unscrew ...
Ender's user avatar
  • 1,950
5 votes
4 answers
1k views

What bike should I buy if I want to fit a child seat and live in area with a lot of hills?

I would like some recommendations for womens bikes that i can fit a rear toddler seat on to. The reason i would prefer a rear seat is because i am short (5ft 3) and my son is quite tall for his age. ...
Clara Sampson's user avatar
0 votes
1 answer
65 views

Pedels move after i stop

Took everything apart cleaned regreased put back together and when I pedel to check the pedels and chain keep going what would cause it and how to fix it is a 20 inch moongoose
Jason Dicken's user avatar
4 votes
1 answer
144 views

Periodic bang on bike freewheel

First of all, this is a great community :) I have bought a trek FX 1 Stagger recently, and there is one problem which I’m not sure how to address. There is a noise coming out of the freewheel whenever ...
Claudio's user avatar
  • 59
0 votes
2 answers
53 views

Remove 7- or 8-speed chainrings from Shimano/SRAM/Sunrace crankset and use on 3x9 speed Samox/Shimano drivetrain?

I have 3x9 gearing on my touring bicycle. I've got a Shimano Acera friction shifting front derailleur and an Alivio rear derailleur. The rear cassette is a Shimano 11-36T. The front crankset appears ...
Habib Ross's user avatar
4 votes
3 answers
126 views

Front derailleur at limit, but still heavy chain rub on cage

Back story: I bought a Giant Defy Advanced Pro 2 second-hand, with Shimano Ultegra components. The previous owner had used it with different components and had the original ones re-assembled before ...
Cedric Reichenbach's user avatar
3 votes
2 answers
68 views

Vintage Motobecane ID

I found this vintage Motobecane bicycle on Facebook for $60 so I picked it up as a project bike. Can anyone help me identify the year and model? I am fairly new to the cycling world. It has Abaresque ...
Bourbonguy42's user avatar
-3 votes
0 answers
34 views

Can anyone help me identify this Giant Bike's make, model and year please?

Looks to be a mountain bike. Primer Gray/w Bold Black lettering "GIANT" F/N:K6GK82599
Bizzy Body Junk Haul's user avatar
7 votes
1 answer
628 views

Why can't the Schlumpf Mountain Drive be used along with the 14-speed Rohloff?

Why is it "not allowed" to use the 14-speed Rohloff in combination with the Schlumpf Mountain Drive? According to Function-Schlumpf-Mountain-Drive.pdf: Please notice: the 14-speed Rohloff ...
Michael Altfield's user avatar

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