Correct BB?

[PeteXXX]

I need to replace the BB on my Giant Defy2.
It's a BC 1.37x24 Road.
Will THIS be the replacement I need as it's sold as a Shimano Tiagra RS500 Bottom Bracket 1.37 x 24 English Hollowtech II but the illustration on eBay is for the one I want.



Ta

 

[Rooster1]

Yes, should be good.
Hollowtech II.
English Thread.


I've also fitted the following to a 2009 Giant Defy FYI

Shimano Ultegra 6800 Bottom Bracket << this one requires a different size tool to fit it.

Shimano Tiagra 4700 Bottom Bracket

Shimano Tiagra 4600 Bottom Bracket

 

[PeteXXX]

Thanks for the info. I'll go for it.

 

[Racing roadkill]

UN55 square taper with a suitable Chainset is the answer. They last forever. But you can’t run HT2 Chainsets with them.

 

[PeteXXX]

I’m happy changing like for like, thanks. I’ve got about 5000 miles out of this one. That’ll do me.

 

[smutchin]

Don't buy it off ebay at that price - you could get it for a tenner if you shop around.

(I bought an RS500 BB for £11 from Wiggle recently.)

 

[User6179]

Am I right in thinking the hollowtech BBs have different size cups now and you need a new sized spanner to fit them?

 

[ianrauk]

Don't buy it off ebay at that price - you could get it for a tenner if you shop around.

(I bought an RS500 BB for £11 from Wiggle recently.)

Ha.. I bought exactly the same only 2 weeks ago

 

[iluvmybike]

The bb should come with the adapter for the normal size cups when u buy it - though some unscrupulous places whip it out of the box and sell it separately!!

 

[smutchin]

Am I right in thinking the hollowtech BBs have different size cups now and you need a new sized spanner to fit them?

The Ultegra and Dura-Ace HT BBs have a smaller outer diameter (as noted upthread by @Rooster1) - you either need a different spanner or an adapter (my BB tool came with an adapter). They thread into the same size BB shell as the 105/Tiagra models though.

 

[clog]

The Newer Dura-Ace and Ultegra/BB-R60 have a smaller outside diameter and will need a new tool or an adapter to fit older tools. (this is usually supplied).

The b/b that was initially quoted, Tiagra/RS500 is a standard fitting which has been used for years and should fit any tool.

 

[PeteXXX]

Don't buy it off ebay at that price - you could get it for a tenner if you shop around.

(I bought an RS500 BB for £11 from Wiggle recently.)

Cheers. I’ll check that out when I finish w*rk