Questions tagged [drivetrain]

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

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11 votes
3 answers
2k views

Can I update a decade-old mountain bike to modern standards?

About ten years ago, I built myself a new bike, for general utility riding and some light trips through the countryside (tens of miles on towpaths etc). I was most familiar with the classic (hardtail) ...
2 votes
2 answers
97 views

Something feels like brake rub but isn't brake rub

I brought my road bike on a flight last week and after I put it back together I immediately noticed it felt slow and muddy. It felt like I had brake rub or a mushy back tire. I'd say it feels about ...
  • 121
3 votes
2 answers
103 views

Boardman Comp Hybrid 2012 - Suggestions for cheap way to get much lower gearing?

I am just about to buy a boardman comp 2012 hybrid bike which I want to use bikepacking. The gearing will be a little high as standard, it's a flat bar setup with Sram X5 9 speed shifters and rear ...
1 vote
1 answer
110 views

What is the largest cassette I can fit on a Canyon Grizl CF SL 7 1by?

I'm considering buying a Canyon Grizl CF 7 1by, but I do a lot of bikepacking in hilly areas, so I'd like to put on a larger cassette to lower the minimum gear ratio. What is the largest cassette that ...
  • 251
2 votes
2 answers
155 views

Will a 11 speed Shimano Deore crankset work with a 9 speed Shimano Altus cassette? [MTB]

I have a 2020 Vitus Nucleus 27 VR with a stripped pedal thread on the left crank arm (bought it secondhand, and am guessing the previous owner crossthreaded it). The current drivetrain is a 2x9 ...
  • 23
0 votes
1 answer
93 views

Tiagra 4700 2x10 vs 105 R7000 2x11 for Gravel Bike

I'm putting together a gravel bike from parts. It will be for mechanical brakes -- cantilever at first and maybe mechanical disc later. I will be buying new shifters, derailleurs, cassette, and chain. ...
  • 180
5 votes
4 answers
1k views

Drivetrain 1x12 or 2x10 for my MTB use case?

I didn't ride bikes for quite some time and decided to start again this year. I'm currently looking for a MTB that will be kind of universal, I'm pretty much set on everything and picked few models, ...
2 votes
1 answer
100 views

Chain not meshing with new cassette

My chain is a SRAM PC-971, worn less than .75", and my derailleur is 9-speed 105. I just installed a new Shimano HG-400 cassette, and it seems like the chain isn't 'meshing' correctly, causing a ...
  • 261
3 votes
1 answer
133 views

Looking for an optical gear display solution for a Shimano Ultegra 10 speed 6700 group set [duplicate]

I upgraded my wife’s road bike for a 2011 carbon Devinci CX4 equipped with an Ultegra 6700 groupset. She’s missing the optical gear indicators she used to have on the shifters. I already looked at the ...
1 vote
4 answers
134 views

Chain skipping teeth while staying on small front chainring

I recently converted my bike with 9 speed 105 from a triple to a double chainring. I installed my new 34/50 crankset and noticed that chain would slip across the teeth of the 34t chainring whenever ...
0 votes
0 answers
23 views

Is it a X sync or an X sync 2

This chainring is it an X-SYNC or X-SYNC2? https://www.bike-discount.de/en/sram-eagle-12-speed-chainring-x-sync-2-direct-mount-6mm-offset It is sold as xsync2 but on the chainring is clearly mentioned ...
  • 145
2 votes
4 answers
301 views

9/10 speed chain with vintage 2x5 crankset

I have an old crankset from an 80s 10-speed (2x5) bicycle with downtube friction shifters. The chain currently in use is marked as "6/7/8 speed," but works fine on the 5-speed freewheel. For ...
5 votes
3 answers
468 views

Improving the Efficiency of a Derailleur: Enlarging the Cassette Sprockets to reduce Friction

For reasons that I have not yet understood, the smallest sprockets with only 11 teeth have prevailed in derailleur cassettes of road bikes, which leads to a very strong deflection of the individual ...
  • 151
2 votes
3 answers
144 views

Chain clanking whenever I start to pedal

Update: I've received the bike back from the workshop, and they did a lot of work! Had to replace the whole drivetrain, all components were completely worn out. This issue started a few days ago and I'...
1 vote
2 answers
84 views

What components of the drive train are cross compatible between casette number of rings(10 / 11 speed)?

I have an old 10 speed road bike fitted with (Mostly) Shimano 105 groupset drivetrain. I'm looking to replace a few parts and I noticed that 10 speed 105 and Ultegra parts are not so easy to find, ...
6 votes
1 answer
509 views

Shimano cassette number of teeth

Newbie question here. Currently on my old Tiagra 4500, I have a Shimano HG50 9-speed Cassette, with 11-25T. I need another cassette, as I got a smart trainer, but it is a bit hard to find such a ...
1 vote
1 answer
305 views

Can this combination work? SHIMANO RD M5120 with a M6000 drivetrain?

I definitely dislike the new proposals made by SHIMANO, but I have found that RD M5120 can be used in 10 or 11 speeds, it would only depend on changing the chain. Well, my doubt arises due to the fact ...
2 votes
1 answer
188 views

Crankset compatibility: Can I replace Shimano FC-M521 with FC-T4010?

I recently bought a Jamis Coda Elite (2012) second hand. I'm slowly replacing all of the drive train as most of the components are worn. According to p114 of the original product catalogue, the bike ...
  • 155
0 votes
1 answer
68 views

Can I put a Shimano 1x12 group set on my benotto xc 4000

I just want to know if there would be any special modifications in order to make it work?
0 votes
1 answer
199 views

Can I use a campy (Campagnolo) 11 speed chain on a Sram Force 22 drivetrain?

After reading this article about “finding the best bicycle chain”. The article goes through factors like chain endurance and power transfer efficiency. After reading the article I see that the ...
  • 103
1 vote
3 answers
146 views

Replacing rear derailleur and shifters when upgrading from 3x7 to 3x9 drivetrain

I am considering upgrading my old trekking bike from a 3x7 to a 3x9 drivetrain. The bike is currently equipped with a 26/36/46 Shimano Exage FC-M320 which I intend to keep due to its wide sprocket ...
  • 151
1 vote
2 answers
507 views

My bike is making a grinding noise when I ride

So recently whenever I am riding my bike and I push down to a certain point, my bike makes a grinding noise and I can feel the main frame grinding as well, I can't seem to identify where it is coming ...
  • 223
1 vote
2 answers
261 views

How to calculate what BB spindle length I need for a mystery crankset?

I'm building up a bike frame with spare/junk components to be my beater bike for commuting. It will be a single speed, chainline on my rear wheel is 42mm. I have a crank set to use, but I'm not sure ...
16 votes
4 answers
3k views

Why are long haul touring bikes sold with 9-speed drivetrains?

Following up on this question, I had a look on the specifications of 'long haul touring bikes', such as the Trek 520, Salsa Marrakesh, and Surly Disc Trucker. One thing that surprised me was that they ...
  • 10.1k
6 votes
1 answer
519 views

Will my mix-and-match drivetrain work?

I'm currently assembling a 3x9 speed commuter bike with the following groupset details: Crank: Shimano Tourney TY501 FD: Shimano Tourney TY510 RD: Shimano Altus M2000 Chain: Shimano 9 speed Sprocket: ...
2 votes
2 answers
96 views

installing 1x11 gearset on a 1986 Bianchi Strada

I have a 1986/7 Bianchi Strada it is a 2x5 gearset, a SuginoVP 110 crankset and shimano derailers. I want to convert it to be more like a gravel bike so change it to 1x11 or 1x9 gearset with 11-36 ...
  • 21
5 votes
5 answers
760 views

Can 2x12 and 3x11 drivetrains have (practical) range greater than 700%?

I’ve come across 2x12 and 3x11 triple cranksets. Can these systems necessarily provide more range than 2x11 and 3x10 @ > 700%? Edit: My question is really what can practically be accomplished, with ...
3 votes
3 answers
475 views

Can I use a 2x10 rear derailleur with 3 front rings?

I am looking at something like SRAM GX 2x10 MTB Rear Derailleur. Will it work with 3x MTB?
  • 144
2 votes
1 answer
90 views

11t sprocket compatibility between Shimano 105 and Ultegra

Specifically, can an Ultegra r6800 11-speed, 11t sprocket replace the 11t sprocket on a 105 r7000 cassette without issue?
  • 123
9 votes
2 answers
656 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 ...
  • 377
3 votes
2 answers
358 views

Can I use a 10 speed Campagnolo Crankset with a 10 speed Shimano drivetrain and chain?

I'm looking at rebuilding an older Cervelo R3 which had a Campy Record setup. Most of the gear is pretty old now and probably needs replacing, and I have a set of race wheels which are set up for ...
0 votes
1 answer
110 views

Help with drivetrain decision [closed]

Currently upgrading my old steel mountain bike for commuting. I need some advice on what drive-train to go with. Current setup is 3x7. I will convert to either 1x9 or 1x10 with new rear wheel/hub. I ...
2 votes
2 answers
126 views

1x7 mtb electric conversion?

I picked up a '93 Marin Bear Valley SE from a vintage store and spent time restoring it (surface rust, old components etc). I was pleased with how it turned out and enjoyed riding it, nice old steel ...
4 votes
1 answer
441 views

9 speed cassette and shifter with an 11 speed derailleur, will it work?

So recently my uncle gave me a Deore M5100 11 speed RD, but my current setup uses an Alivio shifter with a LTWOO A5 elite RD and an 11-46T cassette. While yes the LTWOO RD is designed to handle a 46T ...
  • 41
5 votes
2 answers
339 views

Compound for freewheel locking sprocket threads

I have an oldschool SunTour 6-speed freewheel, where the smallest sprocket screws on the freewheel body to lock the larger sprockets in place. It's a normal right hand thread, so as you pedal in the ...
  • 53
13 votes
3 answers
2k views

Whatever happened to the 4 x n derailleur drivetrains?

Around the mid-1990s I am positive I remember seeing bikes with 4 x n drive trains e.g. 28-speed (4 x 7 gears). There is nowadays a trend towards just 2 or even 1 front sprocket e.g. 1 x 12. More than ...
2 votes
1 answer
147 views

120 BCD Chain ring compatibility

I am converting my merida silex from fsa omega bcd 120/90 bcd 2x9 to a 1x9 drivetrain. I am keeping the cranks and bottom bracket and trying to only change the rings. There are not many 120 bcd narrow ...
5 votes
3 answers
253 views

New freehub body causing chain slack and ghost pedaling

I have replaced my freehub body like-for-like. Now when I freewheel, the top part of the chain goes slack and the pedals spin when I take my feet off them. This usually occurs on old gunked-up ...
  • 153
4 votes
2 answers
727 views

Is Shimano 11 speed crankset compatible with 7-speed cassette?

I'm upgrading an old folding bike (Dahon Speed). It currently has a 7 speed shifter and a Shimano 105 RD. However I haven't decided whether to stick to flat bar or change it to drop bar. I'm wondering ...
  • 139
2 votes
2 answers
90 views

Noise when powering down on left crank only

This one is a mystery to me. I ride a carbon road bike and just recently a clicking noise has developed when I push hard on the left side crank only (right side makes no noise). I have tried different ...
  • 21
0 votes
3 answers
1k views

3x9 versus 1x12

I don't know much about bikes. I bought a "Kona Dr. Dew" 10 years ago, it has a 3x9 set of gears. The front rings large and small have 50 and 30 sprockets, and so I guess that's (9 * 50 / 30 ...
  • 11.7k
0 votes
2 answers
587 views

21 speed to 12 speed conversion! Is it possible?

I have an entry level MTb with 21 speed gear ratio. I found out that i dont need that kind of complexity while riding. 12 speed seems light and compatible to my riding style. It has Shimano tourney ...
0 votes
2 answers
102 views

Possible Maximum Gear Ranges of Each (3?) Possible Triple-Geared Drivetrain

I'm looking for the absolute maximum possible gear ranges from the known/possible triple-geared drivetrains, such as the strategy noted on TrikeTech.com. This involves pairing each of the three known ...
1 vote
0 answers
116 views

Other Dual Drive hubs than Sturmey Archer or SRAM?

I'm looking for a dual drive type hub. At least that's what SRAM calls them. Hubs that are both internally and externally geared. SRAM and Sturmey Archer are the only manufactures of this class of ...
7 votes
0 answers
354 views

Why did Shimano change their rear derailleur design going from a torsion spring to a tension spring inside the parallelogram?

The older Shimano rear derailleurs (pre 7700) use a torsion spring inside the parallelogram. But with the release of the 7700 group they switched to a tension spring which they continued using ever ...
  • 639
10 votes
2 answers
1k views

Upgrade drivetrain to allow faster top speed

I have a bicycle with a Shimano Altus 2x9 drivetrain. It has 36 and 22 tooth chainrings and a 11-34 tooth cassette. I am hoping to upgrade this to extend its high range (i.e. 36/11) without ...
  • 145
16 votes
3 answers
3k views

How many watts are lost when pedalling on Bosch e-bike without a motor/electricity?

When pedalling a Bosch e-bike when its motor/electricity is off, how many watts are lost compared to non-ebike drivetrain? If it differs, let's assume a Bosch Performance CX and 250 watts input power ...
0 votes
1 answer
139 views

Should I Upgrade my MTB Rear Derailleur? (After Crash)

I mashed my 8 speed Shimano Acera rear derailleur in a crash over the weekend and need to get it replaced. Is it worth spending a little extra money and installing a slightly higher-end derailleur, ...
  • 3
7 votes
2 answers
1k views

How to adjust drivetrain so I don't pedal empty air?

You might know what I'm talking about: coast a bit, then start a pedal stroke, and there may be zero resistance for a part of the cycle (let's say 30 degrees) like you're pedalling empty air. Then the ...
  • 143
0 votes
1 answer
149 views

Rear wheel not aligned with frame but cog and crank is aligned

My bike was previously a 26er mtb 3x7speed and I converted it now to be a single speed freewheel bike. Is the bike safe to use if the rear wheel is not straight to the frame? It is closer to the drive ...

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