UN55 Left cup - same as un54?

[rich100]

I need a left cup for a un55 (alloy), is it the same fit as the plastic un54 one? and does anyone know where I can buy a spare?

Thanks

[Brucey]

upgrade UN54 cup in aluminium here;

http://www.sjscycles.co.uk/problem-solvers-up-cup-54-68mm-prod22790/

if no-one here knows, maybe they could advise you?

cheers

[reohn2]

upgrade UN54 cup in aluminium here;

http://www.sjscycles.co.uk/problem-solvers-up-cup-54-68mm-prod22790/

if no-one here knows, maybe they could advise you?

cheers

EEK! I can get a new BB for less than that!
I'm 99% sure they're all the same.

[Brucey]

I've just had a look through my collection of spares and I get

UN71 30.00mm
UN52 30.00mm
UN72 30.00mm
LP27 30.00mm
UN25 30.50mm
UN5x 30.00mm (plastic LH cup, integrated RH cup, label missing)

didn't check the lengths BTW but in theory they shouldn't differ very much.

So with one exception I agree with R2, but I'm not 100% sure I measured a UN54 or UN55 in fact.

cheers

[WrightsW5]

The way they are machined is the main thing, if the design is slightly different you may find it coming loose miles from home.

[The Mechanic]

UN55 BB is only 16.95 at CRC incl. postage. What is the point of buying a left cup for that price plus postage.

[rich100]

OK thanks, I saw those 'upgrade' cups, and came to same conclusion re the price.. seems a waste to buy a whole bb just for a cup but have ordered one anyway.