CODA Magic cranks - educate me please

[swannymere]

Hi, Can anyone educate me on Coda Magic cranks/chainset? Is their a specific bottom bracket, are they any good? etc. etc.

 

[My_Teenage_Self]

Yes, they need a specific bottom bracket (axle & cups), and (very) specific bolt for the arms, specific tool for the BB too, oh, and Specific Shims for the preload on the bearings... The engineering on them is awesome, but they are not renowned for their strength, a lot of early ones came apart where they were bonded together.

Like so many things, they were way ahead of their time, possibly to their detriment as it meant that they were discovering the problems.

Love my set.

 

[swannymere]

Ahh, i'm a bit bigger than average so i'll steer clear.

 

[vtwinvince]

All the above is true. I have a set of the prototypes, and have only ever used them on a stationary trainer.

 

[Ragedracer]

They have pinpointed what time the bonded cranks were affected and each crank has a serial
Number on them. It’s posted online which ones were affected. I am a “big” rider and have not any problems with cranks after the serial
Number period.

 

[swannymere]

Do you have a link to the list? Cheers.

 

[Ragedracer]

Well interesting enough I did save the notice cannondale made bout these cranks. The link no longer works but I can copy and paste what I have. Hope this helps you!

Adrian


IMPORTANT RECALL NOTICE
Re: CODA 900 mountain cranks
Cannondale has determined that some of the CODA 900 Compact Mountain (94/56mm BCD (bolt circle diameter), CODA 900 Standard Mountain (110/74mm BCD), and CODA 900 Standard Road (130mm BCD) left and right crankarms may be defective.
Some of these may split or separate at the adhesive bond line in the center of the crankarm. Unlike a fatigue crack in an all metal product, this "crack" will not grow slowly, but may fail quickly. This design is dependent upon both sides being properly bonded together, and a failure of this bond line could lead to crank failure with the risk of accident, injury, or death.
These crankarms and/or bicycles (1997 Super V3000, SuperV Downhill 4000, 1998 Raven 3000 and 4000) equipped with these crankarms as original equipment were made during a specific time. We ask that you check your aftermarket crank(s) and/or bicycle(s) equipped with these cranks. It is important that no one ride with these crankarms. They must be replaced.
The potentially defective crankarms have date codes between 7182 and 8214 (manufacturing dates from the 182nd day of 1997 through the 214th day of 199. The date codes are stamped on the inside of each crankarm. Earlier or later date codes are fine.
Please check date codes on all CODA 900 crankarms. Any within the date code range must be removed and will be replaced by your Cannondale retailer at no charge.
Note that the chainrings, chainring bolts and bottom bracket are fine. These parts must be saved for use with the replacement crankarms.
Call 1-800-BIKEUSA for help with product identification or the location of your Cannondale retailer.
We apologize for the inconvenience and thank you for your cooperation.

Sincerely, The Cannondale Corporation

 

[swannymere]

Continuing with my education on these cranks.
1. What width is the axle?
2. What width does the BB Shell need to be?
3. Is the BB tool available to buy?
4. Are there fitting instructions an idiot could follow?
5. Would they fit a 1994 Kona Hei Hei?

Thanks in advance for helping the unsure?

 

[nicklej]

Continuing with my education on these cranks.
1. What width is the axle?
2. What width does the BB Shell need to be?
3. Is the BB tool available to buy?
4. Are there fitting instructions an idiot could follow?
5. Would they fit a 1994 Kona Hei Hei?

Thanks in advance for helping the unsure?

Check out this page for more details. I ran some on a 68mm shell. They're basically the same idea as hollowtech II so could likely be used on the Hei Hei.

 

[swannymere]

Thanks, @nicklej i want to buy some but want to be 100% sure they'll fit.