What will replace the quality of the discontinued Shimano BB-UN55?

[fossyant]

thanks for the info though not convinced that this is an advantage, never having felt any need to grease a UN55 (apart from outer threads periodically of course)

Same here - might be for a slightly larger bearing, who knows. Never replace mine unless the bearing's wear, so you get a little bit of play, they still spin fine.

 

[GuyBoden]

I got one of these from Spa when I bought a new chainset and fitted it at the weekend which, or at least tried to. Only a couple of threads in and the ring that the tool locks into sheared off!

FIRST COMPONENTS Bottom Bracket F-2001P plastic cups.

The plastic cup top ring completely sheared off, when I tightened the RHS BB to the correct to torque. I was shocked.

I've ordered a few Tange BB's as spares, just in case.

 

[fossyant]

FIRST COMPONENTS Bottom Bracket F-2001P plastic cups.

The plastic cup top ring completely sheared off, when I tightened the RHS BB to the correct to torque. I was shocked.

I've ordered a few Tange BB's as spares, just in case.

Never use plastic cups. I save my metal ones

 

[GuyBoden]

Never use plastic cups. I save my metal ones

I agree, but I couldn't remove the RHS from the FIRST COMPONENTS Bottom Bracket F-2001P.

Edit: The cups on BB's are not all interchangeable between manufacturers.

 

[Jameshow]

You could try BB30!!!

 

[GuyBoden]

You could try BB30!!!

The jury is still out, see earlier posts:
https://www.cyclechat.net/threads/w...ed-shimano-bb-un55.274954/page-3#post-6463800

I've purchased a new Tange Seiki BB and I already have a NOS BB-UN55 as spares. Obviously, over time we will find out if the new BB-UN300 is durable, but due to it's design, I'm initially not convinced and prefer the Tange Seiki LN-7922 or Tange Seiki LN3922 designs.

But, you could be right, using a UN300 may be the answer.

 

[Jameshow]

I was joking bb30 is the creaking monstrosity in modern bikes including 2 of mine!

Three are st one ht2!

 

[GuyBoden]

I was joking bb30 is the creaking monstrosity in modern bikes including 2 of mine!

Three are st one ht2!

Sorry, I thought that you were referring to a UN300, I've never used a BB30, but I believe they can be converted to Hollowtech.

Don't you have a Cannondale Supersix, popular for British hill climb races.

 

[Jameshow]

Sorry, I thought that you were referring to a UN300, I've never used a BB30, but I believe they can be converted to Hollowtech.

Don't you have a Cannondale Supersix, popular for British hill climb races.

Not quite a supersix it's a six pre supersix. Not as light as a supersix tbh like you titanium bike!!

 

[Tom B]

My 300 has been in daily service for about 15 months now. It seems as boringly reliable as the previous 55s. Though it still has some way to go to get to the age and milage of the 55s

 

[GuyBoden]

My 300 has been in daily service for about 15 months now. It seems as boringly reliable as the previous 55s. Though it still has some way to go to get to the age and milage of the 55s

I took out a 1990's BB-UN52 from a Look bike this week, the precursor to the BB-UN55, the bearings had eventually worn out.

 

[Cycleops]

I took out a 1990's BB-UN52 from a Look bike this week, the precursor to the BB-UN55, the bearings had eventually worn out.

That means it must have only visited one of the nearer galaxies.

 

[GuyBoden]

I've taken an inexpensive BB apart and it's just two bearing on an axle.

The sealed bearings can be removed and could be replaced with better quality sealed bearings.

 

[GuyBoden]

Thankfully, you can still buy a new Shimano BB-UN55 for £21.49 here on Ebay:
https://www.ebay.co.uk/itm/373505407256

 

[ianrauk]

Thankfully, you can still buy a new Shimano BB-UN55 for £21.49 here on Ebay:
https://www.ebay.co.uk/itm/373505407256

Unfortunately, limited in sizes