old hollowgram SI on BB30A

Discuss light weight issues concerning road bikes & parts.
Post Reply
freshlegs
Posts: 57
Joined: Sat Feb 28, 2009 10:30 pm
Contact:

by freshlegs

I have some old Hollowgram SI cranks.

same as these
Image

Will they fit on a BB30A bottom bracket?

Do the bearings press into a BB30A shell or is it like a pressfit30 with cup and bearing press in?

thank you

by Weenie


topflightpro
Posts: 795
Joined: Tue Jan 13, 2009 2:35 am

by topflightpro

The cranks arms should work, but the Spindle is probably not quite long enough. If you got a longer spindle, you would be fine.

That said, I'm not sure if Cannondale changed the NDS arm angle when it went to BB30A. If it did, the NDS arm will be farther from center compared to the DS. I have both versions at home, and I can check them for you when I get back tomorrow afternoon.

freshlegs
Posts: 57
Joined: Sat Feb 28, 2009 10:30 pm
Contact:

by freshlegs

Thank you so much topflightpro.

If you could check that would be helpful.

I gather I'll need a 109mm spindle, does the bottom bracket use standard bb30 bearings? I just read the instructions, seems I can use a pressfit 30 or bb30 in a 2016Evo hi mod.

maquisard
Posts: 1740
Joined: Thu May 01, 2008 8:51 pm
Location: France

by maquisard

You will need a longer spindle/axle as others have pointed out.

However the Q-factor will be incorrect, as the NDS pedal will be positioned further from the centre of the BB by an amount equal to the increase in spindle length. For BB30A Cannondale changed the 'pitch' of the NDS crankarm so that Q-factor would be identical to the way it was with BB30 and the shorter spindle.

If that makes sense!

maquisard
Posts: 1740
Joined: Thu May 01, 2008 8:51 pm
Location: France

by maquisard

-delete-

by Weenie


freshlegs
Posts: 57
Joined: Sat Feb 28, 2009 10:30 pm
Contact:

by freshlegs

Sorry for the stupid questions, this BB30A is messing with my head. I'm trying to solve this issue without having to outlay too much $$.

Do these newer Si cranks have the NDS "pitch" change to correct the 5mm difference?
Image

next stupid question.

I see BB30A frames with Sram Red cranks. How is the q factor on the NDS compensated with these cranks?

thanks again.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post