Tool question--Shimano bottom brackets

[FriarQuade]

Originally Posted by tctyres

AFAIK, they are the same.

They are not the same. The Dura Ace is the same as XTR and Ultegra and XT are the same. They look really damn close but the mid range version is slightly bigger. The plastic shims work well enough for consumers, if you're looking for a real tool I've got you covered

[AngryScientist]

Originally Posted by FriarQuade

They are not the same. The Dura Ace is the same as XTR and Ultegra and XT are the same. They look really damn close but the mid range version is slightly bigger. The plastic shims work well enough for consumers, if you're looking for a real tool I've got you covered

i have one.

man, it's really nice

[eBAUMANN]

Can't beat the Abbey tool but birzman also makes a nifty little double sided adaptor that costs around $15, could be a good option if you are only using it a couple times a year.

[oldpotatoe]

Originally Posted by FriarQuade

They are not the same. The Dura Ace is the same as XTR and Ultegra and XT are the same. They look really damn close but the mid range version is slightly bigger. The plastic shims work well enough for consumers, if you're looking for a real tool I've got you covered

Yup, really nice tool, great for shops who need it all the time.
Wonder what shimano was thinkin when they made the DA/XTR cups smaller??

[FriarQuade]

Originally Posted by oldpotatoe

Yup, really nice tool, great for shops who need it all the time.
Wonder what shimano was thinkin when they made the DA/XTR cups smaller??

Shimano has long had a stance against ceramic bearings with the reasoning being that most of the drag is in the seals. So these new bottom brackets were reduced in size to minimize the seal drag. The reason the Ultegra/XT one is slightly bigger is a little bit more unreasonable. They supposedly couldn't forge the same shape out of the different alloy that Ult/XT uses. I'm sure if they would have looked at that before releasing the DA/XTR version they would have came up with a shape that worked for both. Or maybe they always planned to do it that way, who knows.

[RKW]

Originally Posted by FriarQuade

If you're looking for a real tool I've got you covered

Always buy the appropriate tool for the job. Preferably from someone like Abbey, who stands behind their stuff, and when/if something goes awry, will answer the phone with a person.

[chiasticon]

Originally Posted by AngryScientist

i have one.

man, it's really nice

agreed, it's perfect. as with all Abbey stuff.

while we're on the topic... been a while since I've used a Shimano BB. with the 9100 BB, should there be a decent amount of drag with it when brand new? I know it's a stupid metric but if you give the cranks a decent spin (while no chain on, obviously) they only turn maybe a couple times? seeing this with a GRX crankset. seems pretty draggy to me. wondering if it'll improve...

[tctyres]

Originally Posted by jtbadge

The 9100/9000 and BB-R60 (6800, 5800, R8000, R7000) definitely use a different sized adapter.

DA: TL-FC24
BB-R60: TL-FC25

Originally Posted by FriarQuade

They are not the same. The Dura Ace is the same as XTR and Ultegra and XT are the same. They look really damn close but the mid range version is slightly bigger. The plastic shims work well enough for consumers, if you're looking for a real tool I've got you covered

Thanks for correcting me.

Which are the ones that do not use the insert? Are those the SRAM GXP BBs? ... the 44mm BBs

[oldpotatoe]

Originally Posted by FriarQuade

Shimano has long had a stance against ceramic bearings with the reasoning being that most of the drag is in the seals. So these new bottom brackets were reduced in size to minimize the seal drag. The reason the Ultegra/XT one is slightly bigger is a little bit more unreasonable. They supposedly couldn't forge the same shape out of the different alloy that Ult/XT uses. I'm sure if they would have looked at that before releasing the DA/XTR version they would have came up with a shape that worked for both. Or maybe they always planned to do it that way, who knows.

Reminds me when I asked Wayne Stetina why shimano made their 'new' cart bearing headsets a larger stack than the older ones..making an entire generation of threaded steel forks obsolete..He shrugged his shoulders..He said shimano wanted the bearing size to be a certain size BUT cart bearing..so bigger stack height..Mr shimano didn't really care bout steel fork steerer lengths, but the design of the HS...

BUT shimano can be a real enigma. Still no headsets to this day. Took forever to make a BB 30 crank and BB(not saying that's any kinda of solution-see 'innovate' in other thread).
Chainring BCD that even w/i their own product line(older XT) that weren't intercompatible..7800/7810 DA rear hub..lotsa examples. I've always heard shimano designs in 'triangles'..the guys designing 5800 brake calipers don't talk to the 8000/ultegra group brake designers..why things like barrel adjusters aren't upper and downward compatible.