Questions tagged [shifting]

Questions relating to the act or mechanisms involved with moving the chain from one gear to another.

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13 votes
12 answers
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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 ...
Mark's user avatar
  • 131
5 votes
2 answers
3k 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 ...
audiFanatic's user avatar
9 votes
9 answers
61k views

Chain slipping on newish bike

I've looked at most of the answers for related questions and they all speak about replacing parts that are old. I just bought a new bike from a friend who rode the bike for about a month before ...
going's user avatar
  • 1,509
3 votes
3 answers
382 views

Gear shift adjustments

I recently had to replace the shifters on my bike. The replacement was easy enough, but now when I shift the derailleur either jumps too far or too short. I've tried using the adjustment screws on the ...
DJ.'s user avatar
  • 133
2 votes
2 answers
5k views

8 speed shifter with 7 speed cassette

I just got a bike with broken hanger and derailleur. As the owner didn't want to put money in good parts, I installed a cheap Sunrun derailleur compatible with index, and a new hanger. Just after I ...
Alexander's user avatar
  • 1,844
0 votes
3 answers
1k views

gears overshifting issue

As I have explained in my previous post here I have changed my rear shifter cable and housing. But I'm still having issues with shifting gears smoothly. It overshifts at particular gear combinations ...
samsamara's user avatar
  • 247
37 votes
13 answers
24k 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 ...
Ken's user avatar
  • 1,311
20 votes
3 answers
7k views

What exactly is the "clutch" doing on a Shimano M8100 rear derailleur?

My new Shimano 12s XT 8100 rear derailleur has the switch with on and off positions. From that I found on the web, it is a "clutch" and I must turn it off when removing the wheel. I can ...
nightrider's user avatar
  • 7,768
7 votes
1 answer
682 views

How exactly does cross-chaining accelerate wear?

I've heard all over that cross-chaining "wears your drivetrain out faster". I must admit I'm not 100% convinced that this is true, because I can't see a scientific basis for it. Could I get an ...
BSO rider's user avatar
  • 5,710
6 votes
1 answer
7k views

How to prevent shifting issues due to derailleur or cables freezing in cold weather

It's been fluctating in temperature between 0F and 20F in my area. I've been riding my 1x9 geared mountain bike to and from work. However, due to the cold weather, I'm having issues shifting. It ...
Benzo's user avatar
  • 18.2k
6 votes
1 answer
952 views

Nexus hub keeps getting misaligned

I have a nexus 8-speed internal hub on a Civia Kingfield bike. It keeps getting misaligned -- the dots on the bottom don't line up. In the past I have successfully adjusted it using the barrel ...
Pedro's user avatar
  • 83
6 votes
3 answers
36k views

Bike won't shift at all

I have old old 90's Cannondale that has been sitting in a spare bedroom for the last three years just collecting dust (has not been ridden in those three years). I bought a bike trainer over the ...
RustyStatistician's user avatar
5 votes
1 answer
4k views

replacing shifter cable housing?

My rear cable housing got torn apart while I was tunning gears as you can see in the picture. I'm quite new to cycling so i'm not sure if i should replace the whole cable or just the part of the ...
samsamara's user avatar
  • 247
5 votes
1 answer
27k views

Misadjusted B-screw: symptoms?

What are the typical symptoms of incorrectly adjusted B-screw in the rear derailleur? How does it manifest itself when shifting? Obviously, if the cage pulley interferes with the cog, the problem is ...
AnT stands with Russia's user avatar
5 votes
1 answer
4k views

How to lower gearing on Tiagra 4700

I have a bike with Tiagra 4700 hydraulic groupset and I want to lower the gearing from the present minimum 34/28. The one thing I'd not like to replace is the shifters: These ST-RS405, while truly ...
Konstantin Shemyak's user avatar
3 votes
1 answer
826 views

Chain overshoots cog when shifting from low to high gears

Hi when shifting from low to high gears my chain is overshooting the cog and jumping into the next one. I tried turning the low limit screw outward to move the derailer in towards the low gears but it ...
Paul Elliot's user avatar
2 votes
1 answer
3k views

Front Derailleur Chainring Size Tolerance

I'm rebuilding an old bike and have an existing crankset with 52-42-30 chainrings. I'm looking for a front derailleur. Most of the triple front derailleurs I've come across say they don't support a 50 ...
Kibbee's user avatar
  • 21.7k
1 vote
1 answer
876 views

One extra position on front derailleur besides trim

After I changed shift cables, I have 4 positions on my front derailleur. WTF? I have a double chainring. I have a trim position as well, but after shifting to the big chainring, I can still move the ...
Lord Zsolt's user avatar
1 vote
3 answers
127 views

My bike shifting won’t surpass 6

I own a Scott Aspect 740. On the shifter it says it is on gear 7, 8 or 9 however in reality on the rear derailleur the chain is only on 6 and won’t go past this. I’m looking for a fix as it is very ...
k4mxron's user avatar
  • 11
0 votes
1 answer
127 views

Hey my right gripshift won't turn, need help

My mongoose bikes right shifter won't shift, it's too hard or stiff and the wire that connects to the gripshift is loose which isn't normal because the left shifter is in place and not loose and works....
slickchris 2006's user avatar
-1 votes
1 answer
1k views

Apparently too much rear derailleur cable pull

I have a Deore XT RD-M761 GS medium cage derailleur on my touring bike that seems to move too much per shift. It shifts the chain on a 11-30 8-speed cassette with chainrings being 36/48 and the ...
juhist's user avatar
  • 18.5k