"notchy" feel and sound after changing cassette

satnavsteve

Hello,
Just changed the rear cassette on my Sabbath. Have gone from an ultegra 6700 11-25 to a 105 5700 12-27. The rest of the groupset is all ultegra (compact).

When pedalling slowly with some resistance I can now feel a slight notchiness which I think feels like it is coming from the chainset - almost as if you can feel the chain engaging / leaving the teeth. Can't see anything obvious and had a quick play with inline adjusters but pretty clueless really.

Any advice?

Thanks
S

47p2

Both cassettes are the same spec, just made from different materials

Did you fit any spacers required before putting the new cassette on the freehub?

satnavsteve

Yep, spacer in place as per destructions.

47p2

How old and how many miles on the chain?

sungod

did you measure the chain to check if it's worn?

if not, do it, a worn chain will not be kind to a new cassette

otherwise, probably just needs the adjustment tweaking, although if the old chain was just right for length you really ought to fit a slightly longer one to match the increased size of the largest cog

satnavsteve

Chain has only seen about 700 miles.
From what I've read before, it's a combination that should be ok chain length wise.
What should I be looking at in terms of set up? Changes are all good.