chain slipping on a new bike

Uli

Hello,
I have bought new Voodoo Hoodoo few days ago (I am new to bike riding stuff) and I noticed that chain is slipping on rear small cogs when pressure is applied. I cleaned the cassette and chain but that didn't help. Any ideas please?

Chunkers1980

New, take it back and let a Halfords expert take a peek.

Uli

Thanks, that is a solution but it is a bit of a pain as Halfords is quite far. Anything else I could check?

Chunkers1980

Not really. It's all new, no reason for it to do it apart from setup.

Check nothing obvious is loose.

cooldad

Mech needs a bit of adjustment.
Stiff link in the chain.
Somethings bent.
Pebble in the cassette.

Dub L

Chunkers1980 wrote:

New, take it back and let a Halfords expert take a peek.

I wouldn't use the word "expert" lol. They're alright but they don't usually set bikes up very well.

Darkstalker420

Hi mate to check if the indexing is out:

Turn the bike over and stick it in 1st at the back (small ring at front) and slowly shift to 2nd 3rd all the way down to 9th (or what ever!). Listen out for any clicking or "tinkling " noises. if you can hear any (like the bike is trying to shift up or down by it'self). Look at your rear deraileur (mech) you see where the gear cable enters the mech you can see an adjuster (black usually).

Turning this one way will INCREASE the cable tension the other will DECREASE the tension. do this ONE WAY to see if the noise gets worse OR better if it gets better (you don't want to hear ANYTHING really). If it works job done . If it gets worse then turn it the other way until it stops. Then start at 1st and once again go all the way down the cogs and up to check for any more noise.

Thanks.

Anonymous

If it's the small cogs, check if they are loose. You may have a solid one block cassette, but you might have one that's in pieces, sometimes the small rings are separate from the rear block of the cassette and if the lock ring is not on tight enough the small rings will spin on their own depending on the freehub if they unseat themselves enough. Eventually the thing falls apart and maybe wrecks the freehub too.

I speak from experience (though swiss cheese freehub was the cause in my case).

Lockrings need to be done up to a high torque. Classic kind of thing for a Halfords kid to fail to do up properly.

bamba

One other thing worth considering, you say it slips when your on the small cogs at the rear , which chain ring are you on up front at the time ? If you on the smallest chain ring at the front too, this could be another reason why,to do with chain lines / cross over etc.
Small to small,NO
Big to big ,NO

Anonymous

bamba wrote:

Small to small,NO
Big to big ,NO

Don't know what the OP has though. Would assume a 3x9 set up, in which case no as you say.

Okay on 2x10 though. Certainly SRAM say it's fine. Generally the rings are more in the middle of the range you'd get with a 3x9 and closer to the centre chainline which is why it's not a problem.

bamba

Halfords list it as a 27sp

http://www.halfords.com/webapp/wcs/stor ... 65499#tab2

Uli

Thanks guys. It seems that a little cable tension tweak on rear mech did the job. I must test is properly thou.
Yes it is 3x9 drive.

The Rookie

deadkenny wrote:

Lockrings need to be done up to a high torque. Classic kind of thing for a Halfords kid to fail to do up properly.

Except it should be done up from the factory, nothing for Halfords to touch so why blame them?

mamoo

This is pretty common with a new bike as cables stretch after a little run in and put the mech adjustment out. You can easily see by shifting to the smallest cassette cog and looking at the cable, you shouldn't really have much tension but it shouldn't be slack and loose.

Chunkers1980

Cables don't really stretch though, they are more likely to settle.

Anonymous

The Beginner wrote:

Except it should be done up from the factory, nothing for Halfords to touch so why blame them?

Fair enough if that's the case. Assumed it might be something they have to assemble, but then yeah make it simple for them. Wouldn't trust them though if I got them to service a bike and they replaced the cassette. Always double check anything at all they would have to tighten or assemble.

Uli

Halfords quality would be different topic, but I wish I'd taken a photo of my stem bolts when bike was passed to me. I will not be going back for service there for sure.

The Rookie

deadkenny wrote:

Fair enough if that's the case. Assumed it might be something they have to assemble,

No wheels come in fully assembled, just need putting in the dropouts. why pay UK labour rates when you can pay Taiwanese to do it! (alweays cheaper in a line environment anyway)