Bb30 cranks vs 9000 with adaptor

Discuss light weight issues concerning road bikes & parts.
432r
Posts: 49
Joined: Mon Apr 25, 2011 2:09 pm

by 432r

So bought dura 9000 but my Frame is pf30 thus a bb30 crank would be better.

So what is the better option for stiffness etc and is there a noticablw difference if I use an adaptor and 9000 crank vs bb30 crank? I am 75kg and do sprint pretty hard.

A red22 crank would be the obvious choice if I stayed all bb30. Ignoring the whole I can't have sram and dura mixed together. Which way would you go from scratch? And why?





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wpccrunner
in the industry
Posts: 361
Joined: Fri Dec 07, 2012 8:34 pm
Location: North Carolina

by wpccrunner

get yourself a Praxis BB30-HTII conversion BB. I dont use a praxis BB, but I have heard nothing but praise for these things. Much better than the other types of adapters.

http://praxiscycles.com/product/shimano-conversion-bb/

432r
Posts: 49
Joined: Mon Apr 25, 2011 2:09 pm

by 432r

And you would do this (from scratch) instead of getting a bb30 specific crank?
Eg 9000 crank with adaptor > bb30 crank such as red 22?


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wpccrunner
in the industry
Posts: 361
Joined: Fri Dec 07, 2012 8:34 pm
Location: North Carolina

by wpccrunner

i, as with many people on this forum, wouldnt mix sram/shimano (even though you said it wasnt an issue for you) plus the new DA9000 crank is dam nice.
stiffness would probably be the same. Stiffer DA crank/Rings with potential losses in the adapter vs proper BB30 crank but with not as stiff sram rings.

432r
Posts: 49
Joined: Mon Apr 25, 2011 2:09 pm

by 432r

Thanks. Hmm I'm surprised the red cranks lag in stiffness much behind 9000.

What do these adaptors weigh? I looked at the link but couldn't see any weights

What about something like rotor cranks in bb30?

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r_mutt
Posts: 331
Joined: Sat Feb 23, 2008 6:33 pm

by r_mutt

why don't you get really crazy and use the Campag Over-torque BB30/BB386 crank?

gdherrera
Posts: 11
Joined: Wed Jan 08, 2014 7:58 pm

by gdherrera

Image :welcome:

i'm using this on my ar1
Gil
Oregon
2014 Felt AR1 11 speep di2
2013 Felt F65x trp hyrd

JAGGY
Posts: 54
Joined: Mon Aug 22, 2011 10:56 pm

by JAGGY

Stay with the 9000 crank. All you need is decent BB30 bearings in the frame and the wheels manufacturing adapters.

I run these on all my BB30 frames with my beloved fishing tackle. Cheap, Creak free and very easy to install.

http://wheelsmfg.com/bb-pf30-universal- ... ranks.html

432r
Posts: 49
Joined: Mon Apr 25, 2011 2:09 pm

by 432r

This is a lot cheaper than the praxis above. Does it produce as good a result?
Experiences? Feedback?


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AptosBigRing
in the industry
Posts: 66
Joined: Mon Apr 04, 2011 9:59 pm
Location: Santa Cruz, CA
Contact:

by AptosBigRing

Hi all,
Thanks for the messages/questions on our Conversion BB. Some on this thread emailed us asking about the spec...
Our BB is designed right to Shimano spec which is why we have the bearings outboard. This puts all the pedaling loads exactly where Shimano designed the Hollowtech II spindles to take forces. It's not an adaptor , but rather a full proper bottom bracket for Shimano cranks on BB30, PF30, or Specialized OSBB road frames.

If anymore questions just give us a call at our Santa Cruz office or email info@praxis-works.com and we'll be glad to help.
Thanks for the interest!
Adam@Praxis
Praxis Works
Manufacturer
Santa Cruz, CA
www.praxis-works.com

JAGGY
Posts: 54
Joined: Mon Aug 22, 2011 10:56 pm

by JAGGY

Hi as per my post. I've had excellent results with the wheels manufacturing adaptor. It doesnt crush into the frame like other makes. I had a k-zero screw in BB like the praxis and it cracked the paint on my BB. The wheels will not do this.

Cheap, Creak free and very easy to install.


Just leave your bearings and circlips in and add adaptor.

civdic
Posts: 155
Joined: Thu Feb 10, 2011 8:58 pm

by civdic

I went with a bit of a pricier option with a CK BB and their conversion kit. Never had a creak and didn't have to downgrade shifting by going non shimano ;)

Briscoelab
Posts: 1730
Joined: Thu Jan 26, 2006 6:01 pm

by Briscoelab

Keep the 9000 crankset.

I've had great luck with the wheels mfg or problem solvers adapters.

NealH
Posts: 492
Joined: Sat May 12, 2007 3:40 am
Location: Triange, NC

by NealH

AptosBigRing wrote:Hi all,
Thanks for the messages/questions on our Conversion BB. Some on this thread emailed us asking about the spec...
Our BB is designed right to Shimano spec which is why we have the bearings outboard. This puts all the pedaling loads exactly where Shimano designed the Hollowtech II spindles to take forces. It's not an adaptor , but rather a full proper bottom bracket for Shimano cranks on BB30, PF30, or Specialized OSBB road frames.

If anymore questions just give us a call at our Santa Cruz office or email info@praxis-works.com and we'll be glad to help.
Thanks for the interest!
Adam@Praxis



Good info and thanks.

964Cup
Posts: 191
Joined: Tue Dec 18, 2012 1:31 am

by 964Cup

I've gone for the Rotor BB30 conversion kit. Like the Praxis, it's a full bb, not an insert for the existing PF30. I'll report back when the bike is built. Going from Rotor 3DF w/ Praxis rings to Ultegra 6800 (so same design as DA9000, but heavier/lower grade); be interesting to see if I can feel any difference.

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