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BB30 to 24mm Shimano: what do I need?

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BB30 to 24mm Shimano: what do I need?

Old 06-03-21, 12:55 AM
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Dreww10
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BB30 to 24mm Shimano: what do I need?

Want to put a 24mm R8000 crank on an SL6 Tarmac with BB30/PF30/whatever the hell it technically is.

What do I need to accomplish this and where is the most affordable place to get it?

I already have 30mm bearings in the frame that I can use. Do I need to buy an entire BB from somewhere like Wheels Mfg and remove my bearings, or does something like the 30->24 adapter plugs FSA makes also do the job?
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Old 06-03-21, 07:03 AM
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aggiegrads
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Wheels manufacturing makes spacers and outboard bottom brackets; I think that the outboard is a better solution, but the spacers are cheaper.

The right solution for depends on “whatever the hell it technically is”, so figure out that first and someone here can tell you what you need and where to get it. There are three different spacer kits depending on if you have PF30, BB30, or SRAM PF30.
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Old 06-03-21, 07:07 AM
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Here's one solution. I use a similar version with my bb86, but with better angular contact bearings. The thread together model won't creak.
https://wheelsmfg.com/bottom-bracket...ano-black.html

Here's a better option, but it costs more.
https://wheelsmfg.com/bottom-bracket...nks-black.html
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Old 06-03-21, 12:31 PM
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Dreww10
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Thanks for the responses. Is there a super compelling reason to choose the full thread-together BB over the adapter cups? I'd obviously like to save money, but if it's going to pose a problem in the immediate or near future to which spending the money right the first time makes more sense, then I'd do so.
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Old 06-03-21, 04:19 PM
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BB 30 doesn't have the best record for durability and creak free performance. That’s also why I chose the angular contact thread together for my two BB 86 bikes.
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Old 06-03-21, 06:28 PM
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aggiegrads
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Because the bearings on the BB30 are closer together, there will be more force on those bearings. The wider stance of the thread-together adaptor seems like a better long-term solution, as long as the bearings can be replaced. Otherwise, the BB30 bearings are cheaper to replace than the whole conversion BB.
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Old 06-04-21, 03:16 AM
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Camilo
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Originally Posted by aggiegrads View Post
Wheels manufacturing makes spacers and outboard bottom brackets; I think that the outboard is a better solution, but the spacers are cheaper.

The right solution for depends on “whatever the hell it technically is”, so figure out that first and someone here can tell you what you need and where to get it. There are three different spacer kits depending on if you have PF30, BB30, or SRAM PF30.
I've used the WM adapter bushings/spacers to fit a Shimano 24 mm crank into a PF 30 bottom bracket. They worked fine and were trouble and noise free. The PF30 bearings remain in place as the adapter simply inserts into them and adapts the spindle diameter and matches the width of an external cup BSA/threaded BB.

​​​​​​ For no reason other than wanting a project, I replaced the PF30 bb and the adapters with a Praxis screw together BB this winter. Very similar to the WM product. It was easy and I believe it's a more robust and definitive solution to adapting any sort of PF /unthreaded shell to a crank this.

​​​​​​My wife's new Litespeed Watia has a PF30 shell and I used a WM thread together BB for the Sram DUB crank rather than the PF30 BB for DUB cranks. Easy and solid.
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