All Questions
59 questions
7
votes
3
answers
1k
views
Why does my shifter say the wrong gear?
I had a slow puncture in my rear tyre. I fixed it by flipping the bike upside down, removing the rear wheel, patching the inner tube and replacing the wheel. However, I seem to have caused a strange ...
- 233
0
votes
1
answer
118
views
Help! The two-speed gears on my Brompton don't shift anymore
On my 6-speed Brompton the two-speed gears suddenly stopped working. I still can operate the shifter (and the cable still seems to be under the expected tension), but the two-gear “derailleur” (chain ...
- 433
5
votes
4
answers
1k
views
Chain drops when shifting up a gear at the front?
I've just gotten a new bike and run into a problem. When shifting from a smaller cog to a bigger one in the front gears, the chain consistently drops.
The problem happens regardless of whether I'm on ...
- 51
4
votes
2
answers
127
views
Bike chain jumping at lowest and highest gear, fine in the middle
I changed out the shifter housing/cable because I felt some friction, and ever since it seems like I can't get the indexing right. If I set it to work well in the high gears, it doesn't work properly ...
- 91
0
votes
2
answers
246
views
My bike gears are not shifting and I want to manually get it to stay in 1st gear
My bike doesn't allow me to adjust my gears as it was too stiff. I loosened everything up with WD40 however it still didn't help and now I can't tense up my cable. Please can someone tell me how I ...
6
votes
1
answer
2k
views
Loud clunk moving to smallest sprocket
When I shift gears to the smallest sprocket it makes a very loud clunk sound. There's also a lot of movement in the chain, like a bounce. I've taken a video demonstrating this Video of clunk I'm ...
- 257
2
votes
2
answers
906
views
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 ...
- 2,964
5
votes
1
answer
13k
views
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 (...
- 51
2
votes
2
answers
737
views
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 ...
- 4,043
0
votes
2
answers
764
views
Shifting derailleur without pedaling?
I know shifting gears without pedaling would potentially damage your bike, but would shifting front derailleur while stationary damage anything?
- 141
1
vote
1
answer
539
views
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.
- 185
1
vote
2
answers
144
views
Can no longer shift to lowest gear
I recently worked on my derailleur a bit to fix some issues in high gears, however, now I can no longer shift down to my lowest in the cassette when in either crankset.
I have tried the L screw at ...
4
votes
4
answers
3k
views
Internal Gear Hub Nexus 7
I just bought a new bike and it has the nexus 7 internal hub. This is my first internal hub. I love to ride but admittedly don't know much about the mechanics of bikes. I'm 57 and mostly ride the bike ...
- 41
1
vote
2
answers
729
views
Can I swap my front 2x chainring on my MTB to a ~46T chainring?
The type of cycling I do means I'm never really presented with mega-steep climbs.
I used an online calculator and worked out I never really use gear ratios below about 39, which on my MTB at the ...
- 13
0
votes
1
answer
166
views
Last gear does not work
My bike has 12 gears on the rear wheel. When I put the last gear (12) it starts constantly changing from 12 to 11 gear without me doing anything. For example, I put the last gear and it works; right ...
0
votes
1
answer
511
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....
1
vote
2
answers
1k
views
MTB 1x vs 2x cross chaining [duplicate]
I've got a good deal and bought a new bike with full Shimano XT groupset and 2x Drivetrain which I am not fully satisfied with, it has 34/24 and 11-42 setup.
I would prefer 1x more but not going to ...
- 111
1
vote
3
answers
192
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 ...
- 11
1
vote
1
answer
182
views
Front chainring issues + can I install Falcon Friction thumb shifters to an Shimano STX derailleur set?
I'm interested in trying friction shifters, also to save space on my cockpit. I bought a Mongoose Hilltopper 1994 recently and I want to play with it a little.
A bike mechanic told me in order to ...
- 11
2
votes
1
answer
101
views
Do simpler casettes have less issues with missing shifts?
On my new Trek Marlin with a 8 gear cassette, sometimes I try to downshift into the middle of the range of gears and it doesn't take (upshifting works fine). I can hear the gear clicking for a few ...
- 608
1
vote
2
answers
1k
views
Can't shift to highest front gear
I've been trying to propely adjust front gears in my bike, but failed to do so. I can't make the front gear to shift to highest gear. I can make it work when testing the bike while it's lifted, but ...
- 119
-1
votes
4
answers
2k
views
Is not changing/shifting gears much bad when riding around?
I usually would set the gear to one level and leave it at that if I felt comfortable -- however, I just heard of someone changing gears on stops and whatnot to help with the initial inertia from full ...
1
vote
6
answers
10k
views
Issue shifting from largest cog to second largest
Got a Canyon Spectral 3 weeks ago, have done around 2 hours riding on it and have noticed an issue with shifting from the largest cog to second largest. The drivetrain is SRAM NX 1x12.
There are two ...
- 11
6
votes
2
answers
2k
views
Rear derailleur cage bigger than cassette necessity
I use a Shimano Ultegra 6600 rear derailleur with short cage in a 11/28 cassette. The derailleur is at the end of its useful life and would like to exchange for a cheaper one, since I intend to ...
- 307
1
vote
2
answers
12k
views
Front derailleur cable suddenly very slack (no shifting), not sure what's caused it
I last rode the bike on Sunday. Throughout the ride I noticed the front shifter (grip friction shift, Shimano) was feeling "looser" than normal (hard to describe, it didn't feel "right" and seemed to ...
user38333
1
vote
3
answers
1k
views
Rear derailleur moves to much for each click - tried everything
Two years ago I build a bike (flat bar) with SRAM 1x11. Around a month ago the rear-derailleur broke (guide pulley broke).
I bought a new rear derailleur: Shimano 105 RD-5800-GS.
After installation ...
- 13
6
votes
1
answer
6k
views
Downtube shifters won't stay in low gear on rear derailleur
I've finished a bike restoration today and it's my first time using downtube shifters. They work and will span the full range of gears but won't stay in the big cog on the back for long, the shifter ...
2
votes
2
answers
738
views
Problems with shifter?
I have problem with my gears. How can I fix this or where I can find wire like this?
- 21
5
votes
5
answers
4k
views
Gears shift perfectly when suspended on rack, but not on the ground?
So I had recently solved some issues I was having thanks to the community. I re-tuned my bike on a suspended mount and everytning looks great. On the ground, all of the gears work smoothly except for ...
- 81
3
votes
3
answers
58k
views
All gears shift smoothly, but won’t shift into 1st gear/large cog. Help?
So I was tuning my newly acquired bike today and working with all 8 gears on the rear derailleur. I managed to properly set the high limit screw as well as cable tension so all gears shift smoothly ...
- 81
11
votes
5
answers
12k
views
My bike goes up one gear at a time, but down two: is this normal?
Just over a year ago I bought a new bike (a Giant Escape 3) with a trigger gear system - my previous one had a grip-twist to change gears.
After riding and experimenting for a while, I was able to ...
- 691
3
votes
1
answer
3k
views
Can't shift down from 50T with clutch on, but can shift down with clutch off, why?
Can't shift down from 50T with clutch on, but can shift down with clutch off, why?
I'm using sunrace 11-50 and XT RD-M8000 (SGS), finished setting up everything for absolutely perfect shifting, then ...
user20209
0
votes
2
answers
377
views
My chain slips when I use an inappropriate gear, and the chain loosens when changing gears (most of the time). What should I do?
As the title says, it seems like my chain slips way too often. This happens if I pedal hard, go uphill, or ride at an inappropriate gear (even when not pedaling hard).
Besides that, it seems like my ...
1
vote
1
answer
81
views
21 speed front gears go 1 to 2 to 3 and 3 to 1, but not 3 to 2
My front gears can move up just fine, but to go from 3 to 2 I have to go 3 all the way down to 1 then up to 2 for the chain to engage. Doesn't even seem to try on 3 to 2.
- 11
2
votes
2
answers
417
views
Why can my rear derailer no longer shift between all 8 gears?
After a low-speed collision with a car. my LBS replaced my damaged rear derailer. Shortly after, I replaced chain and cassette (from a SRAM bundle) and the front chain ring myself, as I've done ...
- 439
2
votes
1
answer
926
views
Why does my bike left gear shift have more than 3 combinations?
I just bought a new bicycle and I just read and watched some videos of how mountain bike gears work.
I noticed that the bike is a triple but the left gear shifter has more combinations than 3 (like ...
- 143
1
vote
2
answers
142
views
Shifting Problems
I have a bicycle by the name of "Indarciclo" that I purchased for $20. It has worked excellently for the last 2 years until now. It has 7 speeds, with a under-the-bar shifter. Now, for some reason it ...
2
votes
1
answer
1k
views
Indexing issues on new build, shimano 105 5800
I am in the process of building a road bike.
I currently setting up my rear derailleur. I can't seem to index the gears. I have set the high and low limit screws.
I can shift up the cassette (small ...
- 431
5
votes
2
answers
788
views
Which cables and housing do I need?
I am going to build my own bike. I purchased the 105 5800 groupset the other day and was examining the different components.
The shifters came with some cables and cable housing. I have attached a ...
- 431
-2
votes
2
answers
473
views
How does a RD (rear derailleur) handle variable tooth gaps?
I am trying to better understand how a rear derailleur (RD) works. I can understand how the RD moves inward and outward but suppose someone changes several of their cogs on the cassette. Let's just ...
- 818
4
votes
2
answers
190
views
Poor shifting in dense fog?
I cleaned up my bike yesterday after a particularly wet and muddy week, wiped the oil off the chain, applied a fresh batch, took it for a spin and found no issues whatever with the shifting (I go ...
- 407
3
votes
2
answers
57k
views
Bike won't shift into 2 largest rear cogs (lowest gears)
I replaced the rear derailer on my bike after Schwinn sent it to me. The old one had a bent piece.
I can't shift onto the largest 2 rear gears. I set the shifter to the lowest setting, but the chain ...
- 195
1
vote
1
answer
47
views
I have an old Sugino 110mm BCD ring set, can I replace low ring with SHIMANO FC-5650 chainring 34T?
I have a 48 tooth main ring with 165 cranks. FD is Sora double and rear is Tiagra short with Shimano 7 freewheel. If I can put this 34 ring on it gives me sufficient range for the next few months and ...
- 73
0
votes
2
answers
2k
views
Shimano Gears won't shift
Basically when pushing the button to shift gear I can only get one speed up and one speed down. I tried adjusting derailer and the tightness on cables but it makes no difference.
Figured I'd make a ...
- 11
2
votes
3
answers
4k
views
Rear shifting - Unable to shift to toughest gear
I was adjusting my rear shifting following the advice in this video:
It was when I took off the wire tension and screwed the high limit all the way out that the chain ...
- 123
1
vote
2
answers
4k
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, ...
- 65
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 ...
- 1,874
5
votes
3
answers
586
views
Shifting can't keep up with my acceleration
I noticed that when I really give it hell after stopping or riding slow (I do that all the time on commute), I have to shift two gears at a time in the lower gears, to keep up with my acceleration. I ...
- 163
1
vote
2
answers
2k
views
Shimano Revo shifter does not shift [closed]
I have recently bought a new bicycle and the left Shimano Revo shifter (3 speed) is not shifting, what can I do?
- 11
3
votes
1
answer
877
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 ...
- 133