Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

British 68mm threaded BB for 30mm Cannondale Hollowgram triple crank

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

British 68mm threaded BB for 30mm Cannondale Hollowgram triple crank

Old 01-09-21, 09:56 AM
  #1  
masi61
Senior Member
Thread Starter
 
masi61's Avatar
 
Join Date: Oct 2005
Location: SW Ohio
Posts: 3,055

Bikes: Puch Marco Polo, Saint Tropez, Masi Gran Criterium

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 811 Post(s)
Liked 218 Times in 155 Posts
British 68mm threaded BB for 30mm Cannondale Hollowgram triple crank

Usually folks are trying to take a bb30 pressfit bottom bracket and make it compatible with a 24mm Shimano HT2 crank but I am curious about doing the opposite.....

I would like to mount a Cannondale BB30 (30mm crank axle) crankset into a standard English threaded 68mm bottom bracket. I found one at the Kogel bearings site but it is over $200 and it says it is for Rotor, RaceFace and Easton. Not sure if Cannondale would work.

I was wondering if folks knew if such a bottom bracket could be set up like this. Bonus points awarded for an English threaded 68mm 30mm bottom bracket of good quality for less than, say - $60.

Cheers! From, Bill in Dayton, OH.
masi61 is offline  
Old 01-09-21, 10:43 AM
  #2  
aggiegrads
Senior Member
 
Join Date: Oct 2009
Location: Sherwood, OR
Posts: 1,249
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 314 Post(s)
Liked 275 Times in 161 Posts
Even if you can find a compatible bb, I wouldn’t use one, because the bearings that would have to be used would be far too small to be reliable.

The bb30 spindle is too short for outboard bearings on a 68mm BSA shell, so the bearings would need to sit between the bb shell and the spindle. The thread diameter is about 35mm, which means that the bearing assembly needs to be less than 2.5mm thick. That isn’t enough room for threads, races, and balls.

as far as I know, a solution for this does not exist.
aggiegrads is offline  
Likes For aggiegrads:
Old 01-09-21, 12:00 PM
  #3  
masi61
Senior Member
Thread Starter
 
masi61's Avatar
 
Join Date: Oct 2005
Location: SW Ohio
Posts: 3,055

Bikes: Puch Marco Polo, Saint Tropez, Masi Gran Criterium

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 811 Post(s)
Liked 218 Times in 155 Posts
Originally Posted by aggiegrads View Post
Even if you can find a compatible bb, I wouldn’t use one, because the bearings that would have to be used would be far too small to be reliable.

The bb30 spindle is too short for outboard bearings on a 68mm BSA shell, so the bearings would need to sit between the bb shell and the spindle. The thread diameter is about 35mm, which means that the bearing assembly needs to be less than 2.5mm thick. That isn’t enough room for threads, races, and balls.

as far as I know, a solution for this does not exist.
OK. Thanks for your reply. I guess I will go with a Shimano HT2 crankset then for my project. I will plan on using the Hollowgram BB30 crank on my CAAD9 BB30 project road bike then.
masi61 is offline  
Old 01-09-21, 08:02 PM
  #4  
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Posts: 7,768
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 340 Times in 201 Posts
External bearing English threaded bottom brackets for 30mm spindles do exist. Here is one example. and not too unreasonably priced. https://www.raceface.ca/products/bsa-cinch-30mm
Dan Burkhart is online now  
Likes For Dan Burkhart:
Old 01-09-21, 08:37 PM
  #5  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 2,335

Bikes: lots

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 1091 Post(s)
Liked 1,403 Times in 783 Posts
Originally Posted by Dan Burkhart View Post
External bearing English threaded bottom brackets for 30mm spindles do exist. Here is one example. and not too unreasonably priced. https://www.raceface.ca/products/bsa-cinch-30mm
I'm thinking this would work as well. I was looking at one today...should work but the balls are tiny so it won't last long.
cxwrench is offline  
Likes For cxwrench:
Old 01-09-21, 09:40 PM
  #6  
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Posts: 7,768
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 340 Times in 201 Posts
Originally Posted by cxwrench View Post
I'm thinking this would work as well. I was looking at one today...should work but the balls are tiny so it won't last long.
It uses 6806 bearings which are the same as what is found in press fit 30mm BBs.
Dan Burkhart is online now  
Likes For Dan Burkhart:
Old 01-10-21, 04:39 AM
  #7  
masi61
Senior Member
Thread Starter
 
masi61's Avatar
 
Join Date: Oct 2005
Location: SW Ohio
Posts: 3,055

Bikes: Puch Marco Polo, Saint Tropez, Masi Gran Criterium

Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 811 Post(s)
Liked 218 Times in 155 Posts
Originally Posted by Dan Burkhart View Post
It uses 6806 bearings which are the same as what is found in press fit 30mm BBs.
So I guess if I were to try it, that bearing life might be a bit questionable? Noise (clicking, creaking) would be a no-go. If it would not be silent, it would not be worth the effort.

Thanks for your reply BTW.

Thanks Dan Burkhart for the link.
masi61 is offline  
Old 01-10-21, 06:33 AM
  #8  
dsaul
Senior Member
 
Join Date: Jan 2013
Location: South Jersey
Posts: 1,980
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 595 Post(s)
Liked 487 Times in 325 Posts
As has already been said in post #2, the spindle of the BB30 crankset is not long enough to work with an external bearing like the Kogel or Raceface bottom brackets. Those bottom brackets work with cranksets like the Raceface cinch or 386EVO, which have longer or replaceable spindles.
dsaul is offline  
Likes For dsaul:
Old 01-10-21, 07:56 AM
  #9  
aggiegrads
Senior Member
 
Join Date: Oct 2009
Location: Sherwood, OR
Posts: 1,249
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 314 Post(s)
Liked 275 Times in 161 Posts
Originally Posted by Dan Burkhart View Post
External bearing English threaded bottom brackets for 30mm spindles do exist. Here is one example. and not too unreasonably priced. https://www.raceface.ca/products/bsa-cinch-30mm
Yes, but none exist for BB30, which is what the OP is asking about using. The BB30 spindle is too short for an external bearing.

30mm spindle is not the same as BB30.
aggiegrads is offline  
Likes For aggiegrads:
Old 01-10-21, 08:01 AM
  #10  
aggiegrads
Senior Member
 
Join Date: Oct 2009
Location: Sherwood, OR
Posts: 1,249
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 314 Post(s)
Liked 275 Times in 161 Posts
Originally Posted by cxwrench View Post
I'm thinking this would work as well. I was looking at one today...should work but the balls are tiny so it won't last long.
This will work for some 30mm spindle cranksets, but I am 99% positive that the BB30 crankset that the OP has will not work with that BB.

cxwrench has much more experience than I have so he is really the authority, but I would double check with the crank manufacturer before you buy the BB.
aggiegrads is offline  
Old 01-10-21, 08:30 AM
  #11  
Dan Burkhart 
Senior member
 
Dan Burkhart's Avatar
 
Join Date: Oct 2004
Location: Oakville Ontario
Posts: 7,768
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 771 Post(s)
Liked 340 Times in 201 Posts
Originally Posted by aggiegrads View Post
Yes, but none exist for BB30, which is what the OP is asking about using. The BB30 spindle is too short for an external bearing.

30mm spindle is not the same as BB30.
Yes, you are correct. I missed that part in the original post.
Dan Burkhart is online now  
Old 01-10-21, 08:47 AM
  #12  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 32,999

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 1723 Post(s)
Likes: 0
Liked 617 Times in 452 Posts
Originally Posted by cxwrench View Post
I'm thinking this would work as well. I was looking at one today...should work but the balls are tiny so it won't last long.
I'm not sure this is correct. I used to read the same claim about Octalink bottom brackets, that the large spindle required small, low durability bearings that would wear out fast. I had an FC-6503 Ultegra crank with a V1 Octalink bottom bracket that had more than 26,000 miles and was still running smoothly when replaced as part of a 10-speed upgrade. I don't consider that poor durability.

The similar and contemporary ISIS bottom brackets did have a reputation for poor durability but that was because of poor materials and workmanship, not inherent weakness. The Shimano Octalinks were good.
HillRider is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.