Questions about a bicycle's drivetrain system, including the chain, gears, chainring, derailers, etcetera.

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24
votes
2answers
5k views

Why does pedalling backwards not move my bike backwards?

On the BMX bike I have, pedaling backwards moves the chain but doesn't drive the wheels of the bike backwards like you would expect it to. Why is this?
2
votes
1answer
48 views

Indexed rear derailer shifts two cogs for each step

I'm trying to troubleshoot poor shifting issues on a mountain bike that appears to have been built out of the spare parts box… The current problem is "instability" on the rear derailer – the chain ...
0
votes
1answer
32 views

SRAM compatible 11 speed 12-25 cassette?

I'm looking for an 11 speed 12-25 cassette compatible with a SRAM drivetrain, however I don't think SRAM makes one. They list specs for their 11 speed cassettes as follows: 11-25: ...
4
votes
2answers
426 views

Chain drops in smallest gear under load

I'm baffled. I installed a new chain, cassette, cables and housing yesterday. On the stand, all is happy and shifting is silky smooth. On the road all seems happy except on the bigger cogs in back (in ...
3
votes
4answers
781 views

Are older road bike parts compatible with newer standards? How do older and newer bikes match up performance wise?

I'm a big mountain biker and looking to get into road biking. However, I don't want to drop $1,500 on a new or relatively new road bike without being sure I'd want to stick with it. Anyway, I found ...
0
votes
2answers
67 views

MTB 9 speed sram shifters/rear deralier, shimano 9 speed cassette (HG?) only shifts to 8 cogs

I have an old KHS Team ST frame that I just threw components on about 15 years ago. the drive train is SRAM esp 9.0 shifters and rear derailleur with a shimano HG cassette. I have never been able to ...
2
votes
3answers
3k views

Can you use a SRAM 10-speed Powerlock with a Shimano chain/drivetrain?

I just bought a pair of SRAM Powerlocks for 10-speed chains. The packaging says that they can only be used with SRAM chains. Will anything nasty happen if I use it with a Shimano chain and cassette?
1
vote
1answer
110 views

Campagnolo Crank Compatibility 11 speed crank to 9 speed chain/deraillieur/shifters

I need to replace my 9 Speed Campagnolo Racing T Crank with a new one which uses the power torque system. Is a 11 Speed Athena (or 10 speed Centaur) crank compatible with the racing t front ...
9
votes
9answers
14k views

While pedaling standing up, bike crank gives in as if shifting, what is causing this?

While standing up and pedaling, the cranks give in as if shifting. It seams like I am shifting down, but my hands are off the shifter, almost like the chain is skipping a link. I took it to a bike ...
9
votes
6answers
10k views

Mysterious case: chain falling off large chainring, how to fix?

On my commuter bike I decided to rid myself of the small inner chain ring (which is almost never used) and front dérailleur (now redundant). However, I have come across an unusual problem. Whilst ...
1
vote
3answers
127 views

Is the plastic piece between the seven gear sprocket and the spokes hard to replace, and how?

I was given a 21 gear mountain bike as payment for some work I did for a neighbor which had been in his backyard for about a year. Though it cleaned up very well there is one part I would love to ...
1
vote
2answers
335 views

SRAM xx1 1 x 11 drive train very noisey

I have a 1 x 11 setup on my mtn bike. This is stock from the factory, it wasn't a conversion. When Im in the granny gear climbing, there is a lot of chain/derailer noise. It gets more noticeable ...
9
votes
2answers
1k views

Any experience with shaft driven bikes?

I've ridden a shaft driven bike once, when biking in deserted mines in Limburg.‡ They used shaft driven bikes because the mines are damp, and a shaft can be enclosed completely, protecting it ...
5
votes
3answers
911 views

Has a bike been made with a rear derailleur above the chainstays?

The question title pretty much sums it up, but has a bike with an alternate drivetrain style like this been made? This would mean a derailleur mounted essentially upside down with the tension pushing ...
1
vote
2answers
897 views

9-speed system to 11-speed drivetrain upgrade?

I am currently upgrading my bike from a 9 speed to an 11 speed system. I am currently using shimano 105 components and will continue to use them within the new system. Current bike has a shimano 105 ...
0
votes
3answers
257 views

What does chain worn indicators 75% mean?

I've bought a chain wear checker made by BBB, but not sure what the percentage of worn is about? It has 2 sides, one of them indicates that the chain is worn 75% and I should replace it in the near ...
0
votes
1answer
89 views

Is there a difference between the durability of the chains with 1/8 and 3/32 inch?

I mean, I have a single-speed bike and have chains width 1/8 inch. The other standard I could use on my bike is 3/32 inch wide. Is there a difference in durability?
2
votes
3answers
4k views

Huffy Cranbrook 26“ Ladies' Cruiser crank / pedal / chain ”pop" sound…?

Before you say it's a cheap bike, what more do you want... I get that! :D But it's brand new, and as you pedal it... no matter the speed, you get a pop sound at a specific point on each rotation... ...
2
votes
1answer
205 views

9sp/10sp compatibility in Shimano SLX drivetrains

This is related to my previous question about SLX chainrings. I'm half way through upgrading my drivetrain from 2x9 to 2x10. I currently have: Shifters: SL-M670-I (10sp), Chainset: FC-M665 (9sp ...
1
vote
1answer
177 views

SLX chainring compatibility

I'm considering swapping the inner ring on my SLX double chainset (M665) from 22T to 28T. I noticed that the newer M675 has a 40/28 option, so I figured that the 28T chainring from this set-up would ...
2
votes
3answers
836 views

How to thread gear cables through outers and end caps?

I'm currently putting a bike together with recycled parts and want to get away with not having to purchase a new gear wire. On my first attempt to thread the RD wire I ended up fraying it, cutting off ...
1
vote
1answer
219 views

Can you use an Alfine 8-speed “disc” hub with a non-disc wheel?

I have a city bike with a Nexus 8-speed and I'd like to rebuild the rear wheel with an Alfine 8-speed. The only hubs I can find all seem to be disc mount hubs. My city bike has v-brakes. Is it ok to ...
29
votes
5answers
41k views

What are the pros and cons of internal gears?

I've had my hybrid 24-speed for a bit over 3 years now, and just last weekend, when looking for a bike for my wife, discovered internal gears. Suffice to say it blew my mind when I saw 7-speed ...
7
votes
2answers
329 views

Have there been designs of bikes with stepless transmission?

Today we studied about mechanical stepless drives, which appear to be used quite widely in industry machines, such as CNC lathes. The concept of varying the transmission ratio arbitrary, without ...
0
votes
2answers
147 views

Upgrading rear derailer and cassette

I recently got what most people would consider a cheap and toy road bike as a gift. It came with very primitive RD and cassette (shimano SIS? I think). I enjoy upgrading my stuff, my question is, ...
19
votes
7answers
6k views

Is there such thing as an automatic transmission for bikes?

Has anyone ever designed or manufactured an automatic transmission (or automatic shifter?) for cycling? I imagine such a device would automatically change the gearing to allow the rider to maintain ...
0
votes
3answers
1k views

Difference between road & mountain drivetrain

Basically MTB and road bikes have different brand parts (like deore / XT; Sora / Utegra etc). What are the main differences between the 2 types, that will make it incompatible? Are there things ...
4
votes
3answers
15k views

Can I fit a cassette with a larger range with my Shimano Tiagra 10-speed ( GS-4600) derailleur?

I'm currently running a 2x10 shimano tiagra 10-speed drivetrain with a 50/34 compact crankset, a 12-30 rear cassette, and a Shimano Tiagra GS-4600 derailleur (that's medium cage aka road long cage) on ...
3
votes
3answers
370 views

Chain falling off inner chain ring no matter how L screw is set

Bike is a relatively new Cannondale Carbon Synapse with the Ultegra 6800 groupset (although front chainrings are FSA). Has about 1000KMs on it. Bike has been great, but I went out on a ride today ...
2
votes
2answers
181 views

How much does number of gears matter for a front derailleur?

I need a low clamp 2x10 front derailleur. As it turns out to be a challenge to find locally, I begin to wonder How important is the rear gear specification? What is I get 2x9? How important is ...
1
vote
3answers
579 views

Theoretical question about double drivetrain (both-sides drive)

If one were to take a single-speed flip-flop hub, and fit two identical freewheels, and couple them to two identical chainrings (i.e. two drive-side cranks, one on each side of the bike), you would ...
1
vote
2answers
179 views

What will I need to consider when modernizing a pre-1990s steel frame? [closed]

I'm in the process of upgrading a well loved 1970s steel frame from a downtube shifter system to a modern 'brifter' system. Through this process I've had to look at many disparate sources to get ...
7
votes
4answers
318 views

What's the point in a freewheel/cassette with incrementally sized rings?

Pictured is a freewheel with 15, 16, 17, 18, 19, and 20 tooth sprockets. What I don't understand is why such small increments are worthwhile. Surely the point of having gears is the variance that they ...
0
votes
0answers
67 views

Is this FD compatible with this crankset: 2 teeth too litle

I am a proud owner of this guy. The crankset is SRAM S1200, 36/22 and the FD is SRAM X7, direct mount. However, the cage on the FD broke, and I ordered this item in a hurry. 1) Dyna-Sys 10-speed ...
1
vote
1answer
408 views

Going from a 1x8 to 2x10 setup

After using my bike for a year I feel that although I enjoy the simplicity of a single chainring setup, I would prefer a more versatile 2x10 setup and would like to move to it. Currently the two ...
4
votes
5answers
1k views

Transmission (cassette/crankset) considerations for 1st road bike purchase

I currently have a touring bike, with fenders, rack, panniers, and so on. I currently run a triple crankset 28/38/48 and 9sp 11-34 cassette. I mostly commute and tour with this bike. And with a fair ...
4
votes
2answers
4k views

What's a good, reliable mountain bike drivetrain (1x10?)

I'm thinking about switching my Salsa El Mariachi 29er mountain bike from singlespeed to gears. I love the reliability and simplicity of the singlespeed, but I've been doing more rides that involve ...
-1
votes
2answers
2k views

What components are required to upgrade from a 14 speed to 24 speed?

I made the mistake of buying a 14 speed bike... I live in WA so it's hills everywhere you turn, took it for a spin yesterday and while on flat surfaces it felt great, but taking hills or going down a ...
3
votes
1answer
2k views

Can I run 2x10 XT Shifters on a flatbar road bike with 105 10 speed STI components?

I want to run 2x10 XT shifters on a flatbar but still want use the 10 speed 105 components of the road bike would there be any problems?
30
votes
4answers
6k views

Why do bikes have their drivetrains on the right?

Every bicycle I have seen in my life has its gears and chain on the right side? Why is this? The only thing I could find regarding this question is this forum topic, which speculates about things such ...
3
votes
2answers
750 views

(Automatic Bike Project) amount of torque required to change gears?

I am planning to build an electronically controlled automatic bike transmission for my senior design project. I'm personally more of an electrical guy, so dealing with the mechanics is somewhat new to ...
-1
votes
2answers
195 views
2
votes
4answers
811 views

Replacing 42/52 crankset to 39/52 - will it make a difference?

I have several questions that arise from the fact that the current drivetrain on my old Peugeot road bike is pretty tough to ride when climbing up some steep hills: so I've got a 42/52 up front and 6 ...
6
votes
2answers
372 views

At what point does one need to replace a chain ring on a mountain bike?

The large chainring on my mountain bike is missing a number of teeth on one side (apparently the side I like to go over rocks on). Is it harmful to the drivetrain to ride without these if I'm not ...
1
vote
0answers
28 views

Problems shifting under load [duplicate]

I've spent hours with my bike on the stand. On the stand: it performs great. When I ride, I can cause the rear gears to shift just by changing how hard I pedal (the harder i pedal, the higher up on ...
2
votes
1answer
585 views

Mountain vs. Road 10 Speed Drivetrain Compatibility

I'm modifying my CX bike to double as a lightweight tourer. I'm currently running a 1x10 SRAM Force/Rival drivetrain. I'd like to replace my single front chainring with a "mountain double" to ...
4
votes
1answer
168 views

What is the name of the part by the right-hand pedal on to which the chain grips?

There's a part common to all bikes that resides by the right-hand pedal that holds the front sprockets upon which the chain grips? I'm aware that this part contains the sprocket or sprockets on to ...
3
votes
1answer
3k views

How to remove a Shimano Quick-Link?

I'm currently repurposing an old frame and replacing the drivetrain. If possible I'd keep the old 7 speed drive train the bike had together in case I ever find a use for it. The chain is an HG40 ...
3
votes
1answer
801 views

Can a 10-speed chain be used with a 9-speed cassette?

I have an extra 10-speed chain I would like to use with a 9-speed cassette on my mountain bike. Will this combination work ok?
1
vote
1answer
657 views

What components are recommended for entry level mountain bike?

I am looking for an entry level mountain bike. I plan on using it on real mountain bike trails, not just unpaved trails and greenways. Specifically, here's what I'd like: good shifters/derailleurs ...