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

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6
votes
6answers
9k views

Why are there almost no bikes with a single chainring?

Bikes with two or three chainrings are the norm, and then there are singlespeeds, but except for kids' bikes, you see almost no stock bikes with a single chainring in front but a cassette and ...
2
votes
3answers
1k views

Can I use a SRAM PC850 chain on a 6-speed bike?

I want to buy a chain for a 6-speed bike. I know SRAM chains have the special link, meaning that no tools are needed. I've seen a very good deal on the SRAM PC850 chain, but their website lists this ...
0
votes
1answer
27 views

Conversion 9 spd to 10 spd [duplicate]

I'm thinking of upgrading from a 9 speed (11-34T cassette) to 10 speed. Scoped out a few components and 1) Shimano Deore XT CS-M771 10-Speed Cassette 11-36T 10-speed HG cassette 2) Shimano Dyna-Sys, ...
0
votes
0answers
48 views

Are there any SRAM Apex 1 bikes for sale yet? How long before manufacturers adopt new drivetrains?

I have been looking for a new bike recently, and the gravel grinder category of bikes really appeals to me. However, I also prefer having only one derailleur, and an affordable 1X gravel grinder is ...
4
votes
1answer
159 views

Shimano Cassette 10 Speed Teeth Selection

I am planning to upgrade my drivetrain and I'm in the process of selecting the various components. My bike currently has a Shimano Tiagra CS-4600 10 Speed Cassette 12-28t. I am looking to upgrade to ...
2
votes
1answer
74 views

9-speed Sora w/discs to 11-speed 105 - What Sora bits can I keep?

I'm planning to upgrade from 9 to 11 speed, Sora 3500 to 105 5800. I'd like to keep my existing mechanical disc brakes, which I believe I can, but please correct me if wrong. Also, if I bought the ...
1
vote
4answers
9k 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 ...
3
votes
0answers
84 views

new 9-speed chain fails after 4 weeks and ~240 miles

About 4 weeks ago I installed a new SRAM PC-971 chain on my Surly LHT. This morning I've noticed that one of the outer chain link plates started to pull away (to spread in a way that the pin is not ...
0
votes
0answers
26 views

Want stylish rear derailleur to match 1980s friction-shifting bike? [duplicate]

I've just crashed and bent the Suntour Cyclone long cage rear derailleur which I've used since 1985. (Damn.) Can anyone recommend a new model that meets the following requirement? This was a classy ...
4
votes
2answers
145 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?
3
votes
1answer
62 views

Custom Shimano 3x11 drivetrain

I have a Trek 720 disc which came with a 2x11 Shimano 105 drive train setup. When it's fully loaded for touring going up steep hills is just too hard - I'm barely heavy enough to push the pedal down. ...
6
votes
4answers
202 views

Does (square-taper) BB spindle length affect Q factor?

I am having knee and ankle trouble on my commuting bike (1993 Specialized mtb) and this has a 73mm BB with a spindle length I haven't measured but there is space between crankarm and frame. I wanted ...
12
votes
3answers
6k 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 ...
4
votes
4answers
2k views

Why is my chain riding up and skipping teeth on the freewheel?

Due to a number of reasons, I would like to keep my freewheel at all costs (It's a Sachs freewheel, the bike has all sorts of more 'vintage' components, and they're hard to come by). From reading all ...
1
vote
3answers
3k views

Chainline Alignment Front and Rear

Although I have read Sheldon Brown's All About Bicycle Chainline article I'm still struggling to understand a key point. If you are running a different chainline to the manufacturers (new crankset) ...
0
votes
1answer
75 views

Rear derailleur needs a couple pedalstrokes to change gear

As of late I'm having some trouble with my rear derailleur. When I shift specific gears (most likely to happen to the middle gears), the rear derailleur feels like it doesnt have enough power and ...
23
votes
11answers
9k 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 ...
1
vote
3answers
188 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: 11,12,13,14,15,16,...
5
votes
2answers
1k 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 ...
11
votes
3answers
2k views

What's the point of removing the excess oil after lubing the chain?

There is a very strong point in bike-mechanics culture, which I've seen in very competent answers here, too, to apply one drop of lube in every single roller of a clean chain, and then (!very ...
3
votes
2answers
446 views

Can you use a wide range 11-42 cassette with a double crankset

Can you use a 10 or 11 speed wide range (11-42, 10-42, or 11-40) cassette with a double crankset? I know these wide range cassettes are typically built for a 1x setup on a mountain bike, but is ...
3
votes
1answer
81 views

Converting a 7/8spd cassette to 4/5spd

Lets get some things ticked off: Friction shifting, check Narrow stance cranks, check 2 or 3 spacers on the right hand side, check Single chainring, check (That's the context.) Are there ...
-1
votes
2answers
120 views

Converting single speed bike to geared

First I want to clear out what what I possess: An Avon rowdy single soccer BICYCLE An Avon rowdy DX double disk 21 geared cycle I want to take out the gears from the DX to my single version. I can ...
10
votes
7answers
4k views

Does gear ratio affect Power?

Let me preface by saying that this may not be the right SE. I considered asking on the Physics SE, but I thought I might try here first. If it is wrong, I am not against it being migrated. From basic ...
4
votes
2answers
499 views

Is it possible to install a 1x11 drivetrain on an old MTB?

I have an old Stumpjumper from 1984. It has the original 3x5 drivetrain with friction shifting. I'm intrigued by the idea of converting to a 1x11 drivetrain, but I don't know what factors to consider ...
3
votes
1answer
185 views

Fettling issues - slow shifting rear gears while riding

I've recently had an issue with my gearing, struggling to shift down onto the last few cogs on the cassette. I've got a Shimano Ultegra 6800 groupset, but when I shift whilst riding, I get a "tick-...
5
votes
1answer
270 views

belt vs chain for what matters performance only

Let's set apart all pros/cons of chains vs belts, like: ease of maintenance, need of a custom frame, cost, spare part availability, all of that: nope. This question is very focusing only on ...
7
votes
3answers
672 views

Do aluminium chainrings/cassettes contribute to chain wear?

In trying to achieve a long lasting, low maintenance drivetrain, I've read statements about aluminium oxide being the source of the black colour of chain dirt and also being highly abrasive: ...
2
votes
1answer
50 views

Can I use the drive train of another bike?

I was gifted an old bike that I've decided I want to fix up and use. I believe it's a hybrid, not quite road and not quite mountain bike. It's 21 speed and it's an Apollo quick cross (I can't find ...
2
votes
2answers
924 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 ...
5
votes
2answers
326 views

What parts do I need to upgrade my drivetrain?

I have a Cannondale M300 with a 7-speed drivetrain. The parts are fairly worn and I am considering converting to a 9-speed as 7-speed components are getting harder to find. What parts do I need to ...
5
votes
3answers
350 views

Derailleur Pulley Wheel Compatibility

I can't find replacement pulley wheels for my derailer that are explicitly made for it. Should I be safe replacing them with a set with the same number of teeth (i.e., the same diameter) and targeted ...
5
votes
3answers
1k 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
4k 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 ...
4
votes
6answers
2k 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 ...
1
vote
3answers
6k 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 ...
5
votes
2answers
438 views

What does “chain binding” mean?

I'm reading on chain tensioning, the generic idea is that if the chain is too loose it will fall off, if it's too tight it will "bind". I'm having an hard time understanding what "bind" means in this ...
15
votes
3answers
1k views

How bad is cross chaining?

Accepted wisdom is that cross chaining is bad and that we should never do it. However, most of us set up our bikes so that we can run any gear combination. Invariably, I'll occasionally look down and ...
4
votes
1answer
244 views

Claud Butler Tandem - add a front derailleur?

I'm in the process of stripping a SWB Claud Butler tandem so I can get it repainted. There are a couple of things I need help with.... a) Can you fit a front mech to the bike, and if so, are there ...
2
votes
1answer
121 views

Noisy drivetrain on road bike

I have a noisy drive train on my Trek road bike with Shimano 105. It's very noticeable on the big cog, and is not as bad on the small cog, but still irritating. It's just a constant whiring noise. I ...
10
votes
10answers
29k 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 ...
1
vote
3answers
375 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 ...
0
votes
1answer
154 views

Converting from 7-speed to 10-speed rear wheel

My Bridgestone MB-5 currently has a 7-speed rear wheel. I'd like to convert it to a 10-speed. Is this possible? Is it practical?
26
votes
2answers
8k 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?
3
votes
1answer
136 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 ...
4
votes
2answers
538 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 ...
0
votes
2answers
93 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
5k 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?
10
votes
6answers
14k 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
339 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 ...