New Chain Slipping Under Power

DaveyDave

I was excited to take the bike out for a new spin on my new chain and cassette only to find out it skips under any power. I've had a quick look on the net and I'm not finding anything solid to go on, lots of different suggestions to check. It's like poor shifting as you put power down except instead of just a jolt it seems to happen for the duration of the half a revolution I pedal, if I was to keep pedalling it would most likely keep slipping.

I installed a Shimano HG50 and HG73, both 9 speed Shimano Deore Super Narrow Hyperglide components. I measured my chain following the largest sprocket largest chain ring method on the Park Tool website and I just got a new freehub fitted but I won't rule those two out of the equation. Shifting is fine going through the gears off the bike and I just got a new shifter cable less than 3 months ago.

Where do I start?

bcmf

What do you mean by skip? Does it change gear? Or just jump and stay in the same gear?
Inital thought to me would be a stiff link in the new chain.

ibebanging

DaveyDave wrote: »

I was excited to take the bike out for a new spin on my new chain and cassette only to find out it skips under any power. I've had a quick look on the net and I'm not finding anything solid to go on, lots of different suggestions to check. It's like poor shifting as you put power down except instead of just a jolt it seems to happen for the duration of the half a revolution I pedal, if I was to keep pedalling it would most likely keep slipping.

I installed a Shimano HG50 and HG73, both 9 speed Shimano Deore Super Narrow Hyperglide components. I measured my chain following the largest sprocket largest chain ring method on the Park Tool website and I just got a new freehub fitted but I won't rule those two out of the equation. Shifting is fine going through the gears off the bike and I just got a new shifter cable less than 3 months ago.

Where do I start?

A new chainset !

DaveyDave

bcmf wrote: »

What do you mean by skip? Does it change gear? Or just jump and stay in the same gear?
Inital thought to me would be a stiff link in the new chain.

It jumps but stays in the same gear. Most of the searches I've done in the past hour have come up with people in need of a new cassette which I just got so I'm not getting much information about it.

bcmf

Stiff link.
Turns the pedals with the back wheel of the ground and you should see one link in the chain not going through the cassette and jockey wheels smoothly.
Keeop your eye on the link and when its halfway between the casette and the chain ring grab each side of the link and bend the chain towards you the towards the bike a few times. That should do the trick.

DaveyDave

bcmf wrote: »

Stiff link.
Turns the pedals with the back wheel of the ground and you should see one link in the chain not going through the cassette and jockey wheels smoothly.
Keeop your eye on the link and when its halfway between the casette and the chain ring grab each side of the link and bend the chain towards you the towards the bike a few times. That should do the trick.

I was thinking it was a stiff link. I checked for it when I put the chain on and checked again when you posted but I didn't see anything. I'll check again in the morning after my eyes get some rest, all this searching online is doing my head in.

Mycroft H

How worn is your chainring(s), they can also slip under load if they're worn and a new chain only makes this more apparent.

fixie fox

It sounds like it's your front chainring(s) that need changing. They will hae worn to match the old stretched chain.

DaveyDave

Judging from the slipping and the fact the teeth can't be seen while engaged unlike the inner ring, I'm guessing it's bad. If that's the problem, I should be fine in the inner and outer rings then?

The inner and outer rings have had barely any use as my front derailleur doesn't shift properly so I don't bother. I've clocked up about 7,200km on the bike. This is only the second chain, don't know why I never got around to changing it sooner.

bcmf

DaveyDave wrote: »

I've clocked up about 7,200km on the bike. This is only the second chain

:eek:
I think you may have found your problem.

doozerie

That middle chainring certainly looks beyond use alright. And just to point out, it's worth cleaning the crud off your chainrings (and your rear mech jockey wheels) whenever you clean and/or lube your chain. The oily and gritty muck that accumulates on them will accelerate the wear on both the chainrings (and jockey wheels) and the chain.

longshanks

DaveyDave wrote: »

Chain photomagraphs...

Those pics are shit cool chief

DaveyDave

doozerie wrote: »

That middle chainring certainly looks beyond use alright. And just to point out, it's worth cleaning the crud off your chainrings (and your rear mech jockey wheels) whenever you clean and/or lube your chain. The oily and gritty muck that accumulates on them will accelerate the wear on both the chainrings (and jockey wheels) and the chain.

Yeah, I'll be giving it a good scrub when the chainrings are off. I cleaned the jockey wheels and chainrings as best I could before putting the new chain on but the rings will have to be taken off to get at properly which brings me to my next problem, I couldn't get the last bolt off so I'll have to get one of those bolt wrench tools tomorrow then I'll order the chainring.

Hopefully it won't take too long in the post, I've been getting deliveries from CRC the past 3 weeks or so, should get here by Thursday.

greenmat

doozerie wrote: »

That middle chainring certainly looks beyond use alright. And just to point out, it's worth cleaning the crud off your chainrings (and your rear mech jockey wheels) whenever you clean and/or lube your chain. The oily and gritty muck that accumulates on them will accelerate the wear on both the chainrings (and jockey wheels) and the chain.

+1
Defo front chainrings especially middle are worn and need replacing. Did the same myself last year, changed chain and rear cassette and chain still slipped, was only then I looked at front inner ring, changed it, problem solved.

DaveyDave

Well I got the new ring today as well as a bolt wrench tool to get that 1 last bolt off and as expected, I can't take the middle ring off with the crank on as I hoped from looking at a few YouTube videos. I should have known. On the plus side I got paid for a job I did recently so I'm off to the bike shop tomorrow for a crank puller. Hopefully my LBS has one because my gears are limited and I can't decide if I want to be in the small ring and go really slow or the big ring and waste energy :pac:

As I was messing with the middle ring on the bike though I couldn't help but notice how ridiculously filthy it was even though I only cleaned it recently and it didn't look that bad. I'm thinking about leaving the big ring off as I don't actually use it that much and it would make cleaning a hell of lot easier while still allowing speeds of 49kph.