FRM BB, strong enough?

Discuss light weight issues concerning road bikes & parts.
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Franzam
Posts: 97
Joined: Sun Nov 02, 2003 2:25 pm
Location: Bavaria

by Franzam

I need help:

has someone experiences with the FRm Cu2 ISIS Aluminium Bottom Brackets?

Is it strong enough for my 75 kg /165 pounds?

Thank You

nikh
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Joined: Fri Jun 27, 2003 8:05 pm

by nikh

I have heard they are very stiff and they have replaceable bearings to.
PLAY DARTS! *WARNING* MUST HAVE A SENSE OF HUMOR TO PLAY!!!

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Ye Olde Balde One
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Location: Santa Monica, CA

by Ye Olde Balde One

I have two of them in different bikes. Both work very well and are more than stiff enough.
Ride lightly!

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spytech
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by spytech

They have a ti version also?

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Delpi
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Location: Italia

by Delpi

No, They produce only the Alluminium version.

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spytech
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by spytech

Aluminium spindle, sounds scary, but you guys say its ok, so i will take your word for it.

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Superlite
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by Superlite

Why does it sound scary? If it was a standard square taper it would be a bad idea, not big enought diameter and would probley snap. But wit ISIS, or Cannondales SI cranks they work great. You don't see Cipolini snaping his do you? I would take that as the ultimate sign that they work.

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Florian
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by Florian

Superlite wrote:You don't see Cipolini snaping his do you? I would take that as the ultimate sign that they work.

First of all the Hollowgram axle looks bigger (30 mm dia) to me than ISIS axles.
Then the splines are more "raw" compared to the "smaller" ISIS splines.
ImageImage
Al tends to develop hair cracks under stress. How do these Al axles react on high impact load, especially after a few years?
Aluminium ages.
Salty roads during winter weakens Al, too.
It may last a few years, but do they hold well in the long run?

Just my 0.02 Euro cent... :wink:

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spytech
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by spytech

Florian wrote:Then the splines are more "raw" compared to the "smaller" ISIS splines.

Al tends to develop hair cracks under stress. How do these Al axles react on high impact load, especially after a few years?
Aluminium ages.
Salty roads during winter weakens Al, too.
It may last a few years, but do they hold well in the long run?
Just my 0.02 Euro cent... :wink:


you do make good points, now we need someone who has had this BB for a few years - in everyday use.

benz76
Posts: 152
Joined: Wed Jul 30, 2003 11:00 am
Location: Reggio Emilia, ITALY

by benz76

I don't have a FRM BB, but I have a FRM mtb front hub.
I was the first to have that special hub: it has a 20mm aluminium axle, running on BB sealed bearings. In order to fit it on a standard fork it was provided with two CNC machined aluminium "cups" that reduced axle diameter fro 20mm to 9mm.
I've run it for 9 years (since 1994), and I had no problems at all.
Ok, my axle doesn't have many twisting stresses, but it has lots more impact loads than a BB...
Very strong, very stiff, very reliable.

Hope this could help you...

Bye, Benz.

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