Author Topic: Lightweight Prototype RNC cranks  (Read 2102 times)

Offline out~riding

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Lightweight Prototype RNC cranks
« on: May 18, 2023, 01:10:47 AM »
Quote from: RNC
New prototype cranks. These are made from the strongest metal on the planet that has a tensile strength of 350,00 psi. They will have a finished weight of 349 grams with spindle and bolts and be the lightest crank on the market. For reference my old titanium arms are over 200 grams each. These will be lighter and actually stronger as well.

Offline metalbmxer

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Re: Lightweight Prototype RNC cranks
« Reply #1 on: May 20, 2023, 03:18:11 PM »
These look incredible
Dax (now in LAS VEGAS as of July 2022)

Offline FlatSociety

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Re: Lightweight Prototype RNC cranks
« Reply #2 on: May 21, 2023, 01:28:47 PM »
I speak with Ryan from RNC regularly & he wants to only make cranks with a 24mm spindle only for now on. I tried to talk him into at least a 22mm version, but to no avail lol I explained to him that there is currently no existing Spanish BB that is 24mm compatible. There are bearings of course, but not a complete BB Set. Fortunately, he's made an adapter that will work on a couple of micro sprockets that are newly out that will allow them to be converted to 24mm. I don't know of any Flatlanders that ride 24mm cranks for these reasons, I guess we'll see what happens...

Offline metalbmxer

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Re: Lightweight Prototype RNC cranks
« Reply #3 on: May 22, 2023, 09:14:35 AM »
Oh whoa thanks for the updates!
Dax (now in LAS VEGAS as of July 2022)

Offline DestineyCummings

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Re: Lightweight Prototype RNC cranks
« Reply #4 on: May 26, 2023, 12:57:09 PM »
This is really very, very cool, thank you for your efforts!

Offline smsabb

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Re: Lightweight Prototype RNC cranks
« Reply #5 on: July 10, 2023, 10:22:18 PM »
24mm spindles ? Whats next using cannondale cranks ?

Offline FlatismŽ

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Re: Lightweight Prototype RNC cranks
« Reply #6 on: August 14, 2023, 11:44:06 AM »
Surely 'Spanish bb'is all but done...?

My set-up is street, so flat specific will be limited. Guess Fec Ti will prosper due to this if you feel Ti cranks are worthwhile.

Compared to 22mm. 24mm makes a lot sense, upon my experience.
No extra top hat washers required.
Overall Lighter / stronger / stiffer  gram wise.



« Last Edit: August 14, 2023, 11:46:48 AM by FlatismŽ »
Flat-ism

Offline Mambocowboy

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Re: Lightweight Prototype RNC cranks
« Reply #7 on: August 20, 2023, 11:11:04 PM »
24mm spindles ? Whats next using cannondale cranks ?
I'm done with rnc. Last set wouldn't accept pedal spindle and I had to modify the holes myself.

Offline metalbmxer

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Re: Lightweight Prototype RNC cranks
« Reply #8 on: August 30, 2023, 04:45:50 PM »
Surely 'Spanish bb'is all but done...?

My set-up is street, so flat specific will be limited. Guess Fec Ti will prosper due to this if you feel Ti cranks are worthwhile.

Compared to 22mm. 24mm makes a lot sense, upon my experience.
No extra top hat washers required.
Overall Lighter / stronger / stiffer  gram wise.


If i had pulled the trigger on these (i instead opted for the Far East Ti cranks ... arriving today), I would have simply reamed out my spanish BB. I use the polyurethane BB so they just squeeze into the frame (you have to install them by tightening your cranks down). Very much a fan of spanish, but at this point I can see benefits of a Mid BB like larger contact / welding area for stiffness & strength.
Dax (now in LAS VEGAS as of July 2022)

Offline FlatismŽ

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Re: Lightweight Prototype RNC cranks
« Reply #9 on: August 31, 2023, 12:29:45 PM »
Surely 'Spanish bb'is all but done...?

My set-up is street, so flat specific will be limited. Guess Fec Ti will prosper due to this if you feel Ti cranks are worthwhile.

Compared to 22mm. 24mm makes a lot sense, upon my experience.
No extra top hat washers required.
Overall Lighter / stronger / stiffer  gram wise.


If i had pulled the trigger on these (i instead opted for the Far East Ti cranks ... arriving today), I would have simply reamed out my spanish BB. I use the polyurethane BB so they just squeeze into the frame (you have to install them by tightening your cranks down). Very much a fan of spanish, but at this point I can see benefits of a Mid BB like larger contact / welding area for stiffness & strength.
Good point, regarding larger contact area !
Flat-ism