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Press-fit v Threaded BB - 105 groupset compatibility

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Press-fit v Threaded BB - 105 groupset compatibility

Old 11-21-22, 12:15 PM
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Rossymac79
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Press-fit v Threaded BB - 105 groupset compatibility

Apologies if this is a bit of a noob question, but here goes!


I have been looking into putting together a custom build, and I purchased a Shimano 105 R7000 groupset to base it around. I've been looking at a few different frames to build this up on and spotted one which seems almost ideal for me (a 2016 Orbea Orca).


The only issue is it has a press-fit BB and the 105 groupset came with an English threaded BB (BB-RS501). Should the crankset work with either kind of BB and I'd essentially just end up with a spare BB or are they specific to the different types of BB?


As I said, sorry if this is really obvious to folk with more experience and thanks in advance for any advice!
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Old 11-21-22, 12:35 PM
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Steve B.
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Originally Posted by Rossymac79
Apologies if this is a bit of a noob question, but here goes!


I have been looking into putting together a custom build, and I purchased a Shimano 105 R7000 groupset to base it around. I've been looking at a few different frames to build this up on and spotted one which seems almost ideal for me (a 2016 Orbea Orca).


The only issue is it has a press-fit BB and the 105 groupset came with an English threaded BB (BB-RS501). Should the crankset work with either kind of BB and I'd essentially just end up with a spare BB or are they specific to the different types of BB?


As I said, sorry if this is really obvious to folk with more experience and thanks in advance for any advice!
Either find a frame with a BSA bottom bracket or get the 105 group press fit b-bracket. I would find a different frame with BSA, its a better b-bracket system
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Old 11-21-22, 01:22 PM
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To directly answer your question, the R7000 Crankset is compatible with Shimano compatible Press-Fit Bottom Brackets (BB).
Both Press-Fit and Threaded BB's are sized to be compatible with a particular BB shaft diameter. Some come with spacers in order to be compatible with different Shaft diameters.
The outside diameter of a Press-Fit BB is sized to support the BB standard of the Frame.
Both need to be correct for the Press-fit BB to be compatible with your frame.

HERE IS A LINK TO A LOT-OF-INFO.

You'll find a very mixed bag of opinions regarding press-fit bottom brackets.
Many people just don't like them.
Yet, many high-end frames continue use them.

Whichever way you choose to go, you can't beat having a quality, name brand, BB installed.

All the best

Barry

Last edited by Barry2; 11-21-22 at 01:25 PM.
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Old 11-21-22, 01:26 PM
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Originally Posted by Barry2
To directly answer your question, the R7000 Crankset is compatible with Shimano compatible Press-Fit Bottom Brackets (BB).
Both Press-Fit and Threaded BB's are sized to be compatible with a particular BB shaft diameter. Some come with spacers in order to be compatible with different Shaft diameters.
The outside diameter of a Press-Fit BB is sized to support the BB standard of the Frame.
Both need to be correct for the Press-fit BB to be compatible with your frame.

You'll find a very mixed bag of opinions regarding press-fit bottom brackets.
Many people just don't like them.
Yet, many high-end frames continue use them.

Whichever way you choose to go, you can't beat having a quality, name brand, BB installed.

All the best

Barry
so bottom line is: if the frame the OP is looking at does not have the specific press fit BB installed for R7000 it will need to be pulled and replaced with the correct BB
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Old 11-21-22, 01:57 PM
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Looks like it's a BB386 but do check for yourself... MANUALS ARE HERE


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Old 11-21-22, 02:45 PM
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I guess you are looking at a used frame with a BB still installed. You really have to find out for certain what that BB is or be willing to change it out for the correct press fit BB that is compatible both for the cranks set and for the BB shell on the frame.

If you know that the frame had a Shimano 2 piece road crank in it prior to it being removed, then your Shimano road crank should fit.
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Old 11-21-22, 03:34 PM
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Thanks for your help... a couple of messages to the seller established that it would be compatible, but there's what looks to me like damage on one of the chainstays, so I think I'm going to walk away from this one! I'll hopefully know what to look for next time though!
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Old 11-21-22, 04:46 PM
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Just for posterity...

More than likely, there's an actual press fit bottom bracket for whatever the bike's shell is (BB386, BB30, PF30, etc) which is made for the actual crank you're intending to use. In other words, you just match the bike's BB shell to whatever crank you're wanting to use.

Another type of bottom bracket that does this uses a screw together design to install it into the shell rather than or in addition to a BB press tool. I've used these twice to adapt PF30 and BB30 to the Shimano 24mm spindle diameter. I would recommend these sort of BB's for this sort of adaptation if anyone should need to do one and if you can find one with the correct specs. Again, I have no idea if there are such BB's for all bike shell-crank spindle combinations. I've used both Wheels Manufacturing and Praxis versions and both work well.

There also are simple adapters to an existing press fit bottom bracket that adapt that BB's bearings to a smaller crank spindle. I used one of these on a PF30 bottom bracket with a Shimano Hollowtech crank. It was a simple "plastic" (delrin?) adapter to step the bearing 30mm inner diameter to the 24mm crank spindle. Dead simple to install. I used a Wheels Manufacturing product and frankly, it worked just fine until I just had to replace it (winter boredom) with the screw together BB described above.

Last edited by Camilo; 11-21-22 at 04:54 PM.
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