RdcledwardTomat

I'm very new to road cycling (new bike about a month ago) and i've been experiencing a "kathunk" sort of sound when shifting, as i'm new to this I don't know if it's supposed to sound like this or not. It happens infrequently but more often than not, doesn't seem to matter if i'm shifting harder or easier, bike is orbea aqua 105.

what i've recently done to it is cleaned the chain (degreased / lubed) & fallen over a few times due to clipless-fail.

Any E-diagnosis would be most welcome if this isn't normal

>>>link to video of problem https://www.youtube.com/watch?v=7A_ct6Q-Rts

Bioluminescence

It sounds like you're putting too much stress on the chain when shifting. Ease off pedaling hard for about a half crank rotation while you shift, it'll shift much quieter.

Bioluminescence

Oh yea, welcome by the way!

RdcledwardTomat

Thanks so much! I just look it out for a spin and that's solved it. now I just have to get in the practice of pedaling like that

Bioluminescence

Sure. It becomes second nature pretty soon. You shouldn't have to ease up for that long, or stop pedaling or anything. Just a little stress relief for a split second.

billykmd

Also remember that after a couple of hundred miles of riding, the cable may stretch a bit. You may need to adjust the cable tension once again. Enjoy your new ride!
As mentioned above, try not to mash the pedal while shifting.

Young Version

Sounds like someone replaced your 105 with Sram

dstrong 

My experience is that there are two or three shifts on the rear that are more "kuthunk-y" than the rest. The #7 and 8 cogs (I think) usually have a kuthunk more than the others as I'm heading towards the smallest cogs.

ThinLine

105 is a rather nice group and should have crisp shifting. My SRAM force sounds like that................nothing wrong with it, just can't sneak up on people while shifting like I can with my Dura Ace stuff.