Questions tagged [gears]
Gears in the drivetrain of a bike.
745 questions
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Shimano nexus 3-speed hub gear, yellow dot does not move when adjusting
I have a bike with a Nexus 3 hub gear. Yesterday the shifting got out of whack, when set to gear 2, it was actually in gear 1, gear 3 was 2, and so on.
I looked up how to adjust it, and found that I ...
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How much bend can I have on a gear cable before shifting performance is affected?
I have a Sunrace m2t derailleur on an old Batavus holiday dutch bike and I am running the gear cable from the derailleur down the chain stay under the bb and up the down tube. The bend on the gear ...
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Is it OK to have a single front chainring paired with 7 speed at the back?
I'm planning to have a single front chain ring to be paired with my 7 speed at the back. I'm still saving up for a 10 speed.
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Suntour derailleur compatibility with shimano shifter
I bought today a bike with a Suntour rear derailleur (XR 150 8 speed) for my daughter. It has old rotating shifters I with to replace with triggers.
Will a shimano 8 speed (e.g. Altus/Acera) fit this ...
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combining technologies and speeds: shifter and rear derailleur (index, friction)
is it possible to combine an indexed shifter with old friction derailleurs?
As the cable is moved by the shifter, I understand that derailleurs should work by default and by moved with mm that the ...
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What is the best way to increase gear inches on an old bike?
I only recently got into bicycling and without knowing anything, I bought a bike from a local used bike distributor.
Here's what I've learned about the bike.
The frame, seat, and handles are original ...
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Are there single speed electric bikes already?
Let's see how far the trend of motorcycle-disguised-as-bicycle is at. Electric drive is penetrating most market segments. The front derailleur is dead.
I believe all types of electric motors have an ...
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What happened to the rear gear? [closed]
I commute to work every day, 6km round trip. Everything was fine for many days.
Yesterday, I (believe successfully) switched from 2x2 to 3x7 in order to make some more intense training. I start ...
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Can a gear shifter be replaced?
So I have a geared cycle from Rayleigh. While cycling I fell off, and the gear shifter for front gear broke off with the brake handle.
It was brand new cycle barely month old. and I didn't expect the ...
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Upgrading Gear Train, Brakes, Tires — Cannondale Topstone 4
I just purchased a Cannondale Topstone 4. To be honest, the bike fits me better than any bike I have ever purchased and I feel good riding it. I do, however, have a few issues for which I would like ...
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What else do I need to change if I upgrade my Sora groupset?
I have a Specialized Allez 2019 or 2020 with Sora groupset, but the crankset is Praxis 50/32, and the brakes are Axis.
I changed the rear derailleur to a RD 5700 and I'm looking forward to upgrading ...
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Are equivalent chainring/cog combinations indistinguishable?
Let have these two combinations of chainring/cog. Both for 100 rpm, have almost same speed (and we can of course find cases where the speed matches exactly, but this is a quick example).
50x19-->20....
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My bike's gears won't shift properly or at all
Firstly, sorry if this has been asked before but I don't know much about bikes. I bought my bike from big w (fairly cheap beginners bike, but I am happy with it). It has two shifters, one on the left (...
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Why does my rear derailleur's indexing work for either the high or the low gears, but not both?
I am adjusting my rear derailleur indexing. It seems impossible to find the correct tightness. When I tighten the tension with the tension barrel adjuster, I have one of two problems: either it is too ...
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How can I find out the number of teeth on each cog for cassettes and chain rings?
I am trying to write an algorithm that will give me the number of unique gear ratios given information about chainring(s) and cog pair. To do this though, I believe that I need to know the number of ...
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How to set H screw limit on front derailleur
I have made sure the FD (Front Derailleur) is at the right height and angled parralel to chain.
Now, I have shifted the gears rear and front outward most cog (8 and 3 respectively) and gone to adjust ...
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Uphill gears for Hybrid bike 21 speed
i am new to bike. I recently got 21 speed hybrid bike. I have used almost all gears combination but even slightest uphill is so difficult to pass. Everyone who is saying fitness matters in this, i don'...
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Is there a way to add the gear indicator to my bicycle?
My E-bicycle (12 gears rear only, Shimano Deore XT M8100) has no gear indicator. There is totally no clue which gear is currently engaged.
I find this very inconvenient as using the first (smallest) ...
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Replaced drivetrain but gears still skipping
I have a Specialized Cirrus Sport hybrid and recently replaced the cassette, chain and chainrings (which were very worn). I replaced my Shimano 9 speed 11-32 cassette with a new Sunrun version (also ...
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Gear Problems, cassette shifting
I was tuning my gears on my road bike and I left it when it shifted up and down every gear well but now the next day it is very odd, when clicking the lever it now sounds different and it now won't go ...
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Chain dropping between chainrings when shifting down
I have a power2max NGeco 110mm spider with SRAM 50/34 chainrings mounted on it. I'm using an 11sp chain and an R8050 Di2 front derailleur.
When changing from the big ring down to the small ring, the ...
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Shimano Revoshift twist grip unusably tight
Shimano twist grip shifter on Apollo Neo 6 girls bike. I bought this bike 6 months ago for my 7 year old.
After getting it serviced at 99 Bikes the shifter was so stiff my daughter couldn’t change ...
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How many effective gears do I have on a 21 speed bike?
I have a 21 speed bike (a hybrid commuting bike). But AFAIK, this does not mean that I have 21 different gear ratios. Is there any way to calculate the different gear ratios?
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Correct gear cable for vintage Shimano 600 derailleur?
I'm restoring an old bicycle and need gear cables for this derailleur (see photo). I found some specs here https://velobase.com/ViewComponent.aspx?ID=9422ABE1-A7B3-4622-9DAB-EF4DEC646ED5 but it doesn'...
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Broken Sturmey-Archer dual cable 5-speed shifter
I have this Sturmey-Archer shifter which controls a hub with 5 speeds with cables on both sides of the hub. These 5 speed with 2 cable shifters are very hard to find and my shifter broke as the ...
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Front derailleur cable touching frame?
Installing gears on my bike on my own for the first time.
I pulled the front derailleur gear cable through an intended hole in the frame like so:
So everything should be fine. However, looking under ...
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Are there any electronic shifters that decide front/back for you?
Are there any road bike electronic shifting systems out there currently that only have a single up and down shifter lever and use a computer to make the decision of whether to shift on the rear ...
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Crunching Gears
I had a crash a while back on my road bike and I checked my bike thoroughly and it seemed pretty good. I went on a ride today and the gears were constantly crunching, shifting between gears was fine ...
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Why my bike gear won't change only when I stop pedaling?
I have an issue with my bike, it works nicely until I am changing the gears. Every time I want to change one gear up, I have to stop pedaling or it won't change. There is no issue going back one gear.
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shimano xt m-8000 triple/double
Touring bike which is running XT M-8000 double crankset. It is geared too low. Chainrings are 36t and 26t with cassette ranging from 11t to 40t. I don't think the other M-8000 double chainring option ...
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Does a bike-stalling speed exist? [closed]
Planes can stall. A plane maintains lift through speed. If the speed drops below a threshold, the plane stalls and begins a downspiral.
Now that many 1x modern bikes are discarding front derailleurs, ...
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Shifting derailleur without pedaling?
I know shifting gears without pedaling would potentially damage your bike, but would shifting front derailleur while stationary damage anything?
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can't stop pedaling or chain drops down
Managed to unstick derailer. But can't stop pedaling or chain drops down.So when trying to stop bike. have to take feet off pedal to not catch chain
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New to Bikes: My chain fell off and I put it back on. How can I know if it's on the right cog?
I am new to bikes not ridden one since I was 11 I am now 63!
I have a mountain bike and never used gears before they are mind boggling.
I went out and rode it no problem but trying gear changes I don'...
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Fastest possible drivetrain?
I am looking for the ideal gearing to achieve good speed on a gravel bike when commuting. 2x11? 1x12? 3x12? 10-52? 11-50? How many teeth on the chainring? I know I could go faster if I get a road bike ...
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Please identify my Orbea
Bicycle helps in my exercise to lower cholesterol. Like the way it coast and how light it is.
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front gear shifter cable sleeve, shifter to frame needs replacing, the old wire rusted inside
bought this bike 2nd hand from charity shop,
front gear shifter was sticky and wouldn't shift to 3 [3+8 setup] as was already at 3. [streached?]
''bloke who brought it in said it just needs oiling'',
...
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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 ...
- 131k
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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 ...
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Gear shifting is good enough after 6 years. Does that mean I don't need to replace my cables?
My road bike gear cables have never been replaced, they are 6 years old now. The shifting at the back needs at tune up now and then, more and more frequently as time goes. But once it's done the ...
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Can I use a 7 speed shifter on an 8 speed cassette
I am currently upgrading my mountain bike and have bought a set of wheels that accepts 8,9,10 speed cassettes but my previous wheels used a 7 speed freewheel. If i install the new wheels with an 8 ...
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Replacement parts for old Giant CRS 4.0
I'm looking at replacing the cassette and chainrings on an old Giant CRS 4.0 bought way back in around 2009 (I think) and trying to find compatible (and still available) parts.
Its parts are listed as
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Why do I constantly have to re-index gears?
I've got a road bike with a high end 11 speed groupset that is about 3 years / 30,000 km old. Chain and cassette have both been replaced recently (i.e. 500 km ago).
What I'm experiencing is a constant ...
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Slight indexing issues on new 11 speed drivetrain -- normal?
I have a 20" folding bike that is about a month old and came with a Tiagra drivetrain. I subsequently switched it out to a 11 speed drivetrain (Shimano 105 R7000 with flatbar SL-RS700 shifter). ...
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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 ...
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Triple to double chain ring
I have a defy 3 with a triple chain ring I would like to change it to a double can it be done and what will I need?
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Why are IGH minimum gears expressed as ratios not contigent on wheel size?
I've wondered about this before, but I'm doing a Brompton Rohloff conversion for someone and the moment has finally arrived where it's not just a theoretical issue:
Shimano and Rohloff both recommend ...
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Why does my gear slip when going uphill / standing?
I have a road bike that I use to commute ~6 miles to work every day. Some of the portions of the ride are at a steep incline, and I've noticed that when I get up to stand on some of these hills, my ...
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Difference between Shimano HG51 8-Speed Cassette and Shimano HG50 8-Speed Cassette
Can anyone tell me the difference between Shimano HG51 and HG50 8-Speed Cassettes?
I can't find any information online about this so was hoping someone might be able to help me.
I am looking to ...
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when shifting to smaller cog, chain skips a gear
So if i start on the biggest cog, shift down once, nothing happens. If i shift again, it shifts, but skips a cog to go to the third cog.
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