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Discussion Starter · #1 ·
I just got a new Scalpel SI from a warranty and I am almost done building it and I just noticed that the bearings from my old Scalpel SI will not fit into the new frame. It looks like I need to install cups for the bearings but I am unsure which cups I need. My crankset is a Cannondale Hollowgram SI. Not sure a reminded is needed or warranted but the frame is AI.
Thanks!!!
 

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I just got a new Scalpel SI from a warranty and I am almost done building it and I just noticed that the bearings from my old Scalpel SI will not fit into the new frame. It looks like I need to install cups for the bearings but I am unsure which cups I need. My crankset is a Cannondale Hollowgram SI. Not sure a reminded is needed or warranted but the frame is AI.
Thanks!!!
Newer frames are PF30. They are the same 30mm bearings that are pressfit into a cup and then into the frame. There are several PF30 options which include either plastic or aluminum based BB cups.

Since it is a new frame, I would just get a new PF30 BB.
 

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Discussion Starter · #4 ·
To add more confusion...I just found this: "In 2018 the Scalpel Si cross country race bike seems to have PF30A83, Same as PF30A, only wider by 10mm. Even though the numbers seem the same, this is does not use the same crank set or spindles as the SuperX. Mountain bike crank sets are traditionally 5mm wider than road crank sets."

I really still don't know what I am supposed to purchase.
 

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I forgot to ask, is the new frame aluminum or carbon? I'm assuming it is Carbon since it seems to have the larger PF30 BB.

The PF30 Carbon Scalpels do have the "BB30" as the PF30 is still technically BB30 d/t the 30mm spindle size and using "BB30" cranksets.

The 83 refers to the BB shell width, the A is for Asymmetric as Cannondale likes to add the 5mm to the NDS.

The spindles will definitely be different as stated. The scalpel will take the mountain spindle (137mm) because the chainstays are wider for the wider tire, the SuperX will use the 119mm (1x) or 125mm (2x).

As far as cranks are concerned, you can definitely use the Hollowgrams. You'll need to get an Ai offset chainring, though. I personally use these...

https://www.garbaruk.com/cannondale-hollowgram-oval-ai-compatible.html

Depending on your spindle/spacer set up, you may need to get the 137mm spindle with the appropriate spacers.

Spindle:
https://www.cannondaleexperts.com/Cannondale-BB30-Spindle-137mm-Mountain-KP308_p_6362.html

Spacers (NDS 14mm/DS 9.1mm):
https://www.cannondaleexperts.com/C...indle-Spacer--Non-Drive-Side-14mm_p_5638.html

https://www.cannondaleexperts.com/C...k-Spindle-Spacer--Drive-Side-91mm_p_5642.html

You'll be able to use your previously installed bearing covers, plastic spacers and wave washer
 

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I forgot to ask, is the new frame aluminum or carbon? I'm assuming it is Carbon since it seems to have the larger PF30 BB.

The PF30 Carbon Scalpels do have the "BB30" as the PF30 is still technically BB30 d/t the 30mm spindle size and using "BB30" cranksets.

The 83 refers to the BB shell width, the A is for Asymmetric as Cannondale likes to add the 5mm to the NDS.

The spindles will definitely be different as stated. The scalpel will take the mountain spindle (137mm) because the chainstays are wider for the wider tire, the SuperX will use the 119mm (1x) or 125mm (2x).
I haven't had a carbon PF30 bike, so I'm not an expert, but

Don't all C'dale BB30 mtb's use the 137mm spindle? Which I assume the OP is moving from his old frame?

So all he needs is the PF30 bb (KP197) and an AI chainring?

Maybe the OP might find this helpful:

https://www.cannondale-parts.de/Web...99CB/51A4/5CB9/1941/C0A8/2ABB/631D/SI2016.pdf
 

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I haven't had a carbon PF30 bike, so I'm not an expert, but

Don't all C'dale BB30 mtb's use the 137mm spindle? Which I assume the OP is moving from his old frame?

So all he needs is the PF30 bb (KP197) and an AI chainring?

Maybe the OP might find this helpful:

https://www.cannondale-parts.de/Web...99CB/51A4/5CB9/1941/C0A8/2ABB/631D/SI2016.pdf
Not all BB30s use the 137mm.

There were several iterations of the Cannondale BB30 spindles.

Years ago the MTBs used 73mm shells and would take 128mm, 131mm or 132mm spindles. In addition, these spindles has a NDS flange which was later replaced by spacers.

Sent from my iPhone using Tapatalk
 

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It is Carbon...I'm just going from a 2017 to a 2019. Looks like I have the correct spindle and spacers. Will this BB work? Wheels Manufacturing PressFit 30 Bottom Bracket with Angular Contact Bearings https://www.amazon.com/dp/B00CG6AJUC/ref=cm_sw_r_cp_api_i_BK2bDbXGV45H8
Most definitely will work, although Westy is right, the threaded one probably worth extra $. It will decrease likelihood of creaking and noise, the main problem with PF30.

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That's my understanding.

But for some more dollars, the thread-together version might be worth a look:

https://wheelsmfg.com/bottom-brackets/pf30/pf30-threaded-angular-contact-bb-black.html
No, this BB will most DEFINITELY NOT WORK. Its for BB shell width up to 79mm.
When you install this BB the threads will not engage without both cups pressed a little way into the frame. You ill not be able to line the statt of the thread up to prevent cross threading if you force the two parts together. If you;re lucky enough to get the two parts to thread correctly you will only have 5 threads engaged to hold the parts together. That isn't enough an will likely cause a failure of the BB unit casing (not the frame BB shell).

If opting for a press fit BB then the WheelsMFG PF30 Pressfit bb works.
If opting for a thread together pressfit BB then you have to purchase a BB386EVO or a BBInifinite for PF30-83A.
After this your axle is fine as long as it is an Ai BB axle. SRAM cranks for the Scalpel come with this spindle, Stages spindle or the Cannondale Ai 137 spindle.
 

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Thread together BB's that work in a Scalpel Si frame:

Wheels Manufacturing BB386EVO
Token Ninja TF4630 or TF4630-TBT Be sure to purchase the long life installation tool or the Park Tool BBT-27.2. The OD of the unit is 49mm and a BBT29 will not engage)
ROTOR UBB4630 (be prepared to replace bearing fairly quickly with decent units)
BBInfinite PressFit30-83 (it is important not to confuse with the normal PF30 as the 83 unit is 10mm longer)
 

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Good catch on the threaded PF30A BB, Brad.

WheelsMFG needs to update the link on the compatibility chart under the Cannondale Asymmetric Integration entry.

https://wheelsmfg.com/bb-standards
I have mailed them on this issue and haven't received a response. I chatted to their local distributor who after trial fitting a bb to a Scalpel then understood where I was coming from. The compatibility chart unfortunately is a fairly simple device that merely refers the user to a specific webpage.
If they simply create a proper drop down menu in their database where they could then list the correct BB's they'd be able to fix the issue. One has to read the descriptions. All the PF30 thread together list 79mm as the ma Shell width. All the PF30 press in units accommodate up to 86mm shell widths. They need to create seperate category for the Ai units where the BB386EVO is included. But I guess because this considered a Road BB they don't want to. If its the seals they're concerned about then that is easily changed through swapping out the bearings. I'll take it up with them again
 

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Ditto. Sorry about that.

Now who makes a BB30 for my Fat Caad!
What's the BB shell width?

Generally if it's BB30A then replacement bearings work or if a PF30A-(insert bbshell width ) then a std pressfit PF30 bb will work.
If you want a thread together unit then you may have to look at WheelsMfg but is limited to 100mm BB shell for 30mm cranks and 132mm max for 24mm cranks incl GXP

https://wheelsmfg.com/bottom-brackets/fat-bike.html

So crank and bb shell width is important info to help you
 

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What's the BB shell width?

Generally if it's BB30A then replacement bearings work or if a PF30A-(insert bbshell width ) then a std pressfit PF30 bb will work.
If you want a thread together unit then you may have to look at WheelsMfg but is limited to 100mm BB shell for 30mm cranks and 132mm max for 24mm cranks incl GXP

https://wheelsmfg.com/bottom-brackets/fat-bike.html

So crank and bb shell width is important info to help you
Yeah, I want unobtainium: Thread-together BB30XL, 120mm shell, 30mm C'dale spindle
 

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The Fat CAAD is a true BB30, NOT PF30. The bearing presses directly into the frame, so you only need to replace the actual bearings themselves.

The only press in, threaded, true BB30 bottom brackets are to adapt to 22/24mm spindle cranks.

BB30 shell diameter 42mm
PF30 shell diameter 46mm
 
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