BB86 BB

[roger44]

I have acquired a BMC Teammachine SLR01 frameset, it needs a bottom bracket.
According to BMC spec its a BB86.
I fitting Ultegra groupset.

my question is, the frame measures 74mm across width,
so is it really a BB86 I need?, or is that for a framewidth of 86mm which it what the BB86 BB states.

confused, any help gratefully recvd

 

[adscrim]

I've got a slr01 from 2012 and it's got a dura ace BB92-41 bottom bracket in it - ie shimano BB86.

 

[roger44]

I've got a slr01 from 2012 and it's got a dura ace BB92-41 bottom bracket in it - ie shimano BB86.

yes the Shimano product spec for BB86 shows the 92 as compatible, its the numbers that are confusing, when they talk about shell width of 86mm, do they mean shell width of the BB or of the frame?

 

[User6179]

when they talk about shell width of 86mm, do they mean shell width of the BB or of the frame?

Shell width of the frame I think, the bb comes with 2mm lip on each side, so an 86mm frame will end up 90mm.

 

[iluvmybike]

I seem to remember mine also had a little spacer for drive side sop everything ends up right

 

[roger44]

Shell width of the frame I think, the bb comes with 2mm lip on each side, so an 86mm frame will end up 90mm.

but my frame width is around 74mm?????

 

[Cycleops]

This is a press fit BB? You'll need a few special tools to remove and install the new one.

 

[User6179]

but my frame width is around 74mm?????

This is a BB86, does it look like yours? Are you including the bit that sticks out in the measurement?

 

[roger44]

This is a BB86, does it look like yours? Are you including the bit that sticks out in the measurement?

View attachment 398944

thats my problem the frame came empty, and I dont have a clue about the different types of bb designations. it would make sense that the cups will stick out, but I also dont have the outer covers either, so will have to look those up as well

 

[User6179]

thats my problem the frame came empty, and I dont have a clue about the different types of bb designations. it would make sense that the cups will stick out, but I also dont have the outer covers either, so will have to look those up as well

How old is the frame?

 

[roger44]

How old is the frame?

2014

 

[Cycleops]

What year is it? This is a 2014 model and it's flush.

 

[roger44]

YES THA

What year is it? This is a 2014 model and it's flush. View attachment 398946

Yes that looks like what I will have,

 

[boydj]

Google bottom bracket standards and you'll find lots of info on what's required in terms of bottom bracket, convertors and matching up with your chainset. Most have options for pairing up with standard Shimano 24mm axle chainsets, and other chainset standards.

 

[User6179]

YES THA

Yes that looks like what I will have,

There looks like a bit protruding on the drive side, don't you have that on yours?