0
votes
2answers
78 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, ...
0
votes
1answer
110 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 ...
3
votes
3answers
146 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
173 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
107 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
2answers
488 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 ...
4
votes
2answers
263 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 ...
4
votes
2answers
280 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
3answers
1k 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 ...
0
votes
2answers
214 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 ...
1
vote
2answers
451 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
254 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 ...
8
votes
6answers
7k 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 ...
6
votes
8answers
17k 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 ...