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3
votes
3answers
105 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 ...
1
vote
2answers
62 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?
2
votes
1answer
69 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 ...
3
votes
4answers
480 views

Rear derailleur shifting poorly, skipping gears

I've got a Shimano Sora on a 8-gear cassette, and have odd behavior and skipping, shifting under stress. This started with a trip to the mechanic for a tune up which replaced the chain. I had some ...
1
vote
0answers
25 views

Problems shifting under load [duplicate]

I've spent hours with my bike on the stand. On the stand: it performs great. When I ride, I can cause the rear gears to shift just by changing how hard I pedal (the harder i pedal, the higher up on ...
3
votes
2answers
290 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 ...
0
votes
1answer
92 views

What are the standard shifter designs and mechanisms? [closed]

What are the standard shifting methods? I only know the shifting dial on flat bars and the old fashioned levers on ten speeds. I'm not asking about when to use a particular gear but the mechanics of ...
4
votes
2answers
163 views

How should I select front and rear gears?

Just bought a Falcon Interceptor bike with Shimano gears - whatever that means. I've had bikes in the past but only those with one set of gears for the rear wheel. What's the need for front and rear ...
2
votes
1answer
426 views

Cant get my rear derailleur to reach all cogs

I have been having an issue on my road bike getting the rear derailleur to reach all of my cogs. I can either not reach my two smallest cogs or two largest cogs depending on the cable tension. I ...
3
votes
2answers
230 views

Are there any tricks or pitfalls in timing gear changes?

I have noticed that my bike sometimes changes gears incredibly smoothly—quietly, quickly, very little 'jolt' through my pedals—while other times I get a rough, clunky change. I'm wondering if there's ...
1
vote
2answers
354 views

Shifters compatable with: SG-3D55 (Shimano Nexus 3 speed - disk brake - internal gear hub)

I am planning to buy the SG-3D55 internal gear hub. According to this forum post, the SL-3S35 is compatible. But what about the other 3 speed nexus shifters? I am finding it hard to find any ...
1
vote
3answers
469 views

Gear up-shift not smooth

When I am pedaling hard and shift to a larger sprocket, the shift is not smooth or sometimes doesn't happen at all. Sometimes even double up-shifts don't work. There is no problem shifting when I test ...
8
votes
6answers
1k views

Is standing up and peddling on multi-gear bicycles a bad idea

After reading While pedaling standing up, bike crank gives in as if shifting, what is causing this? , I was thinking well for starters one should probably not be standing up to pedal under normal ...
17
votes
6answers
2k views

Is there such thing as an automatic transmission for bikes?

Has anyone ever designed or manufactured and automatic transmission (automatic shifter?) for cycling? I imagine such a device would automatically change the gearing to allow the rider to maintain ...
5
votes
1answer
347 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 ...
0
votes
2answers
209 views

Unable to change from 14th to 7th

I've got a bike that I have had for about 8 weeks and it has already been back to be serviced twice. It's just returned from the second service and I've noticed that it is not shifting from 14th to ...
3
votes
4answers
5k views

Front derailleur is hard to shift into the big ring. Where to start?

I have a shifting problem on a bike that has a crank with a triple set of chainrings. The bike is a tandem. I have to put a great deal of effort to get it to shift into the big ring. Where should I ...
1
vote
3answers
895 views

How do I prevent STI shifter cables from blocking access to my Randoneering Bag or Handlebar bag?

I've got drop bars with Shimano Tiagra STI shifters and want to use a Rando Bag on my small front rack or a handlebar mount bag. Currently the shift cables jut out between the drop bars and hit in to ...
1
vote
2answers
405 views

SRAM force rear shifts go in the wrong direction when on largest cassette

I got a new bike about 6 months ago with SRAM Force on it. It's my first time riding SRAM and I love it except for one thing: If I'm climbing and my RD is shifted all the way up ( to 28-tooth ) and ...
1
vote
1answer
230 views

Bicycle is Having a hard time Shifting — especially gears 13 and 14

21 speed commuter bike. Raleigh 2011 brand. After my gear shifter cable was broken, I took it into the shop to get it fixed. (4 days ago). Ever since, when shifting, it takes forever to actually ...
2
votes
2answers
198 views

How do you switch grip shifters from shifting as if they were on the opposite derailleur?

I was replacing cables on grip shifters recently and when I put them back together they acted as if they were on the wrong side. By that I mean the front shifter (3 chain rings) were shifting 7 times ...
7
votes
6answers
5k 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 ...
3
votes
3answers
248 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 ...
5
votes
7answers
13k 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 ...
6
votes
2answers
652 views

Cleaning Cable Housing?

I commute about 3600 miles a year and I am able to keep my gears adjusted pretty well. I do find that I get a lot of grime from rainy, muddy conditions, and I think I might be replacing my shift ...