Hollowtech 2 Gap?

[Thomk]

I've just had my cranks changed due to a failure in the old ones. Got the bike back today and noticed a gap between the crank and BB. Now there could easily have always been a gap there but I don't remember it and wonder if some spacers should have been put in (between the BB and the frame)?

 

[simon.r]

Is the gap the same all the way round? It's probably the angle of the photo, but it looks as if it may be cross-threaded?

If I was fitting that I think a thorough clean of the bottom bracket shell, plenty of grease and a reasonably determined pull on the spanner would mean no gap.

The other possibility is that the bb shell needs facing.

 

[TissoT]

Its fine that's how they should be with a few mm between the BB/Crank Arm

 

[phil_hg_uk]

On my 105 there is a plastic spacer like this

 

[alicat]

I agree it looks cross threaded. My bike has a gap between the cranks and the Hollowtech bottom bracket but it looks even, unlike yours.

I would go back to the shop and get them to refit the crank in your presence.

 

[Thomk]

I think the gap looks even all the way around in real life. Don't the BBs come with a few spacers?

 

[phil_hg_uk]

I think the gap looks even all the way around in real life. Don't the BBs come with a few spacers?

If it is a shimano look here -> http://techdocs.shimano.com/techdoc...KWd9ZNc0GX1ynyTpwcmK!-534712169?bmUID=k1yXO6d for the parts breakdown and install guides and see if it shows one.

 

[Thomk]

Thanks. It does show a spacer inbetween the crank and BB.

 

[accountantpete]

Depending on the model there should be a small O ring between the crank and the bearing -this prevents the cranks moving about on the axle.

It may be only just bigger than the diameter of the axle - so take the crank off and make sure it is there.

 

[Thomk]

Depending on the model there should be a small O ring between the crank and the bearing -this prevents the cranks moving about on the axle.

It may be only just bigger than the diameter of the axle - so take the crank off and make sure it is there.

Is the O ring part of the crank or the BB?

 

[Thomk]

Here's the techdoc for the BB:
http://techdocs.shimano.com/media/t...01/SI-1LM0A-001-ENG_v1_m56577569830671289.pdf
It does say use spacer and ring for triples but mine is a compact

 

[phil_hg_uk]

Here's the techdoc for the BB:
http://techdocs.shimano.com/media/t...01/SI-1LM0A-001-ENG_v1_m56577569830671289.pdf
It does say use spacer and ring for triples but mine is a compact

What does it say under the tech doc for your chainwheel ?

 

[Thomk]

What does it say under the tech doc for your chainwheel ?

It's here:
http://techdocs.shimano.com/media/t.../FC/EV-FC-3550-3413_v1_m56577569830799977.pdf
Doesn't look like there are spacers. I guess the O ring AP mentioned is number 5 which I'll check for in the morning. So does that mean the gap is normal?

 

[Sittingduck]

The spacer is only for triples. Dont ask me how I know this

 

[Thomk]

I think I'll take it off and put it back on with care and see if the gap disappears.