Questions tagged [gears]

Gears in the drivetrain of a bike.

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0 votes
1 answer
64 views

Derailleur intermittent rubbing

So my front derailleur gets rubbed on by the chain when I give it a good push. If I have the bike up and just turning the crank or gently pedaling there is no rubbing, but if I put my weight into it I ...
3 votes
1 answer
136 views

How can I add an additional freewheel to the existing solid bicycle axle?

I want to convert my bicycle into an electric bike by adding a motor to it, allowing me to ride it using both pedals and the motor. I need to add a motor and a separate chain system, similar to the ...
0 votes
0 answers
51 views

How to replace a band (hub, drum) brake with a freewheel

I am looking to convert my bicycle into a semi-electric bike by adding a freewheel. The 2 freewheels will allow me to use either pedals or an electric motor to move the bike. However, I don't have ...
4 votes
2 answers
800 views

Cannot figure out how to stop outer edge of front derailleur hitting chain

I have a Giant road bike with Shimano Ultegra gears. The outer side of the front derailleur is making contact with the chain, on both crank chain rings, when in the highest gear at the rear. I have ...
4 votes
1 answer
526 views

Will this chain work on my bike?

I've bought the Shimano HG40 chain which is advertised as a 5,6,7 and I think 8 speed chain. I've just received it and it also says 15,18,21,24. (Obviously including the front gears). My bike is a 2x6 ...
4 votes
4 answers
2k views

Can I replace hood covers on Shimano ST-2300 brake/gear levers?

I'm looking to buy a replacement cover on my right brake/gear lever which is a Shimano ST2300. I've found a 'Shimano Bracket-Cover Hood Dual-Control-Lever R9150/R9170' Road-Bike on AliExpress, but I'...
0 votes
1 answer
94 views

My shifters are stuck in the negatives

So I recently bought my first bike. It worked great until winter hit. The gears stopped working and my girlfriend (who bikes way more that I do) said they so that when it gets really cold sometimes ...
5 votes
3 answers
3k views

Does effort require to pedal depend on the gear ratio or the gear inches?

I have a 20x1.75" 6-speed folding bike with 52x14-28t drivetrain. Even with the gearing at 52x14, ~3.71 ratio, I can still pedal uphill. I also have a 700x25C fixed gear with 49x17t gearing or ~2.88 ...
8 votes
2 answers
640 views

Gears rattling in the back [closed]

My MTB is making weird rattling noises in the rear. What could be wrong? I'm in Australia and my bike has sram components. Picture:
15 votes
2 answers
2k views

Bike mechanic told me: Gear cable too "springy"

I bought a new groupset and I tried installing it all myself. Somewhere I must have messed up, because I could not get it to shift precisely. I took the bike to my local bike mechanic. He told me he ...
3 votes
1 answer
2k 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
4 answers
684 views

Chain drops when shifting up a gear at the front?

I've just gotten a new bike and run into a problem. When shifting from a smaller cog to a bigger one in the front gears, the chain consistently drops. The problem happens regardless of whether I'm on ...
1 vote
2 answers
2k views

Bike keeps suddenly changes gears w/o me shifting

I've noticed that there are times that my bike suddenly changes gears, without me touching the shifters. It usually happens when I'm on a hard gear and I suddenly power out of a full stop, it pops ...
0 votes
2 answers
210 views

5 Gears usable out of 6

I have mountain bike which is around 1.5 years old. When I bought it, I used it without any hassles and all was fine. But one day I overshifted the friction shifter and the shifter was bent. Now it ...
-4 votes
2 answers
200 views

Is the gear cycle a sham? [closed]

Why do I think (and based on my personal observation) that gears in cycles are no better? It just slows down the cycle speed. The effort needed to push the cycle is more in a gear cycle. Considering ...
3 votes
2 answers
110 views

Bike chain jumping at lowest and highest gear, fine in the middle

I changed out the shifter housing/cable because I felt some friction, and ever since it seems like I can't get the indexing right. If I set it to work well in the high gears, it doesn't work properly ...
6 votes
1 answer
1k views

Loud clunk moving to smallest sprocket

When I shift gears to the smallest sprocket it makes a very loud clunk sound. There's also a lot of movement in the chain, like a bounce. I've taken a video demonstrating this Video of clunk I'm ...
12 votes
2 answers
22k views

Moving from Shimano 9- to Shimano 10- speed

I'm thinking of changing the 9-speed Tiagra rear mech on one of my (road) bikes to something, still Shimano, but 10-speed. The obvious replacements I'll need are cassette, right-shifter and chain. But ...
4 votes
4 answers
2k views

Is it possible to replace/regear the front cog? My easiest gear is too easy and I want to try for a higher resistance

I have a big-box-bicycle that I ride around the neighborhood regularly. After trying to master the highest gear setting I now find it easy on days where there isn't a breeze, and still manageable on ...
0 votes
2 answers
130 views

My bike gears are not shifting and I want to manually get it to stay in 1st gear

My bike doesn't allow me to adjust my gears as it was too stiff. I loosened everything up with WD40 however it still didn't help and now I can't tense up my cable. Please can someone tell me how I ...
2 votes
1 answer
104 views

Does this chain seem short? Does this photo indicate any obvious drivetrain issues?

Addition. Yes this is the large-large chainring. The shifting is rather poor but I have not tuned high, low and B, tension etc. Thank you I recently moved to a larger chainring. The shifting seems ...
2 votes
2 answers
91 views

Turbo Trainer Cassette vs Bike Gears

I’ve just purchased a Pinnacle Smart Trainer. In addition a 2nd hand Carerra bike. In my incompetence with anything practical, I’ve not read the instructions. The turbo requires a 8/9/10/11 speed ...
6 votes
5 answers
1k views

Training vs increasing gear ratio

I’ve just done a 1500km ultra cycling event, the lowest gear setup are front 30t back 40t. Along the journey there are many very long climbs that have more than 10% gradient. To conserve power I ...
1 vote
4 answers
1k views

Quad chainring (4x12)?

Does anyone yet make an affordable quad chainring? I would love to see a 4x12 with my staggered cog idea such that all 12 gears are shifted progressively using the 4 chainrings. Each chainring would ...
4 votes
1 answer
4k views

Chain get stuck on front sprocket during pedalling

When pedalling the chain sometimes get stuck on the front sprocket. This happened after I cleaned the gears and replaced the chain. What could cause this? The purple line is the chain. The circles ...
3 votes
4 answers
165 views

Chain rub on chainstay when in smallest front crank and highest gear

I've just bought my son a 2nd hand Orbea MX 27 (thought it was an MX40 but the groupset is consistent with the tech specs of the 2020 27). It was hardly used so doesn't appear to be age / mileage ...
1 vote
3 answers
205 views

Cracking noise coming from front gear when pushing on the pedals hard

Usually when the chain is on the biggest gear, whenever I push the pedals too hard, i hear a "cracking" sound from the front gear. I am not sure how to describe the sound, it sounds kinda ...
2 votes
5 answers
5k views

Rear derailleur doesn't go to smallest cog

I'm sure it is a simple fix to this, but please bear with me. I have recently swapped my rear wheel on my bike (with an identical one, keeping the same cassette). Upon putting it back in, I noticed ...
1 vote
1 answer
97 views

Can i replace just the brake on a bike that has a combined shifter/brake lever unit

i’ve just bought a new bike with shifter and brake units together on the handlebars. i want to replace the brakes with hydraulics from my last bike (new bike has cable brakes), however i don’t know if ...
2 votes
0 answers
134 views

Bicycle chain roller diameter size chart?

I'm digging for a while now, and can not find any helpful chart for chain roller diameters e.g. Shimano 8,9,10,11,12 speed. It differs of course depending on the manufacturer and the purpose. We know ...
49 votes
11 answers
41k views

What's the efficiency of hub gears compared to derailleurs?

What's the efficiency of hub gears compared to derailleurs? I know that hub gears are not as efficient. Apart from being heavier, how much will I lose in performance if I use hub gears?
1 vote
1 answer
203 views

My bike has a 10 speed cassette. MTX hub motor takes 9 speed cassette can I remove last cog of my cassette without issues?

I need some advice. I have a Giant Anthem 2012 dual suspension bike. And want to put a 1500 watt 26" MTX cassette type rear hub motor onto it. I believe the MTX wheel can take up to a 9-speed ...
1 vote
1 answer
67 views

Gear won't change to bottom range if set for top and won't change to top range if set for bottom

Fit the following, all new drivetrain components to my Pinarelo that has Ultegra shifters: Tiagra 11t-34t cassette chain long cage derailleur derailleur hanger If I set it up such that the top gears ...
-1 votes
2 answers
193 views

Broken gear shifter case. Is it safe to use?

My campag gear shifter is cracked in the plastic. I realised this when changing bar tape. It works perfectly and may be from a crash a few years ago. Is it still safe to use? Thanks for all opinions ...
5 votes
1 answer
77 views

Bike cable tension not consistent when shifting up as compared to down

I'm trying to fix an issue on a (somewhat cheap) newer bike and it's giving me a bit of a run around. The issue is that when shifting up and down, the alignment is off. Normally, I could easily fix ...
16 votes
5 answers
6k views

Is a 1:1 gear ratio the same regardless of the specific gear sizes?

I have a gravel 1by bike with 42t and a 11-42 cassette. I also have a road bike with 50-34t and then 11-34 cassette. My question. When going uphill in easiest gear in both, they would both be a 1:1 ...
7 votes
3 answers
3k views

SRAM XPLR for a 2x12

Hello fellow cyclists, Could someone please explain to me why XPLR rear derailer is 1x only? I want to install it on my gravel bike with 43/30 double chainring upfront. What can go wrong? Thanks! -----...
7 votes
2 answers
355 views

No locked off youth gearing restriction for road racing British National Series/Championships

Can anyone correctly confirm (by providing a link to the exact rule in British Cycling rulebook), if the use of locked off gears is permitted in Youth (A, B and Junior) National level series or ...
3 votes
3 answers
4k views

Need help understanding my grip shifters on my handle bar

I am new to mountain bikes and recently bought the Apollo Phaze bike. I was wondering if anyone can help me understand the functions of these gears and when to shift them. For example, when commuting ...
7 votes
6 answers
950 views

How to create a bicycle that rolls backwards when you pedal forward?

This may seem like a crazy question, but I am currently trying to design a kinetic machine where pilots are facing away from the direction of motion, adding whimsy and curiosity. As someone who doesn’...
0 votes
3 answers
653 views

Triple chainring + nonstandard sloped cogset. Can this work?

It seems that on my mountain bike and all other multispeed bikes I have seen having a rear cassette or freewheel all have sloped cogs, meaning they go from largest to smallest in order of decreasing ...
27 votes
4 answers
74k views

Help Me Understand My Bicycle's Gears

I've recently started commuting with a bicycle (Giant hybrid bicycle). I've been trying to learn a little about bicycling to make my commute easier and my time on the bicycle more enjoyable. Please ...
10 votes
7 answers
4k views

Why do front gears become harder when the cassette becomes larger but opposite for the rear ones?

I noticed on mine and other road bikes that the "big" front gear becomes "harder" (more distance per revolution) when it switches to the bigger cassette. That makes sense, larger ...
2 votes
2 answers
598 views

Shimano 105 - Shifter Internal Lever Broken

I've managed to snap an internal lever (it looks similar to the one on the right side in the pic) in my Shimano 105 (11-speed) right shift - think I just pushed it too far over and it snapped. I can't ...
0 votes
1 answer
102 views

Gear combinations for 3×7 Raleigh CHESTER 21 2022, frame size 50 cm

Continuing Which gears combinations shouldn't be used? and How do I know what gear combinations should work without chain rasp on front derailleur?, which are rather generic questions and answers, ...
3 votes
4 answers
2k views

How do I know what gear combinations should work without chain rasp on front derailleur?

I tried adjusting the front derailleur on a 3x10 trekking bike. After fiddling around a long time, I concluded that is probably not possible to make all cogs work with all chainrings. How do I know ...
4 votes
1 answer
201 views

choosing the right gear ratio

I am due to a new set of chain rings and chain on my bicycle (which I bought second hand). The current gear is: Front: 53/39 Rear: 11/28 I used to be a competitive racer wich made these gears also ...
3 votes
1 answer
456 views

Clonking sound when pedalling in 5th and 6th gear?

I just purchased a bike, with 7 gears. When I cycle in 5th and 6th gear it's making a clonking noise when pedalling. It doesn't do this noise in any other gear just the 5th and 6th. My partner said ...
4 votes
3 answers
2k views

Options for a super-compact crankset for touring (replacing Shimano 105 crankset)

I plan to use my new Canyon Endurace AL (11-34, 52/36) for some touring and I'd like some slightly more pleasant gears as I'll be carrying some weight (I have a tailfin rack I'm using with it) up some ...
1 vote
0 answers
441 views

Adjusting road bike to Wahoo Kickr: is this chain noise from cross-chaining, or do I need to index the gears?

I've got an 8-speed Mérida road bike (that is, 2x8, 2 front, 8 rear) that I'm fitting to a 2020 (v5) Kickr that I just bought new. I am learning about some bike mechanic stuff that despite many years ...

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