Just went on to hollowtech 2 bb for the first time and ive put 2 washers drive side and 1 washer the other but my mech wont go over enough to change to the outer ring should i change washers roung

yes

what size BB shell do you have.

How wide is your BB shell? If it’s 73mm, you only need the one (Drive Side) washer.

nope it 68mm

Hmm wondering if mine’s right

http://singletrackworld.com/forum/topic/68mm-bb-and-ht2-bb-spacers

Assuming you’ve adjusted the limit screws and set the cable tension correctly, it may be that you have an old mech designed for a narrower chainline. It may be possible to bodge it by swapping BB spacers, but a newer mech may be required.

Weirdly, my latest HT2 BB came with different sized spacers to the last one – one very thin one instead of one of the 2.5mm spacers. I just used the old ones, and it seems to work fine.

Anyone know if I should have done something different?

No I’ve got new xt top swing mech

Andy,

Please specify the model numbers for the crankset and front mech, as well as ring sizes.

PaulD

Xt m770 front mech top swing
Xt crank set

Xt m770 front mech top swing
Xt crank set rings are all 2.5 x 3

Andy,

I was not specific enough, but what chainring sizes?

M770 front mech should be OK for a triple 44-32-22 and be fine for your crankset with the 2+1 spacers on a 68mm shell.

Check the mech limit screws and the shifter cable slack.

PaulD

Yeah I’ve checked lot
Screw and try pushing mech over won’t go any further

any suggestions then