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 Post subject: Re: EBay CNC Crank
PostPosted: Thu Sep 28, 2017 9:19 pm 
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in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 3264
Location: Glermsford, Suffolk U.K
Will i die. Lets find out.

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 Post subject: Re: EBay CNC Crank
PostPosted: Thu Sep 28, 2017 10:04 pm 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8509
Location: Los Feliz, Los Angeles, California
tmr5555 wrote:
Why are they not available in bigger lengths?


They are advertised for 'Brompton' for a reason. :wink:

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 Post subject: Re: EBay CNC Crank
Posted: Thu Sep 28, 2017 10:04 pm 


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 Post subject: Re: EBay CNC Crank
PostPosted: Thu Sep 28, 2017 11:25 pm 
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Joined: Sat Feb 07, 2009 5:52 am
Posts: 579
check these things frequently for cracks if you ride them. I've busted a crank in mid-flight, not fun. My tail bone hurt for months afterwards (and I didn't even land on it)


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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 3:45 am 
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Joined: Tue May 08, 2012 3:10 am
Posts: 159
Location: Santa Barbara
spud wrote:
check these things frequently for cracks if you ride them. I've busted a crank in mid-flight, not fun. My tail bone hurt for months afterwards (and I didn't even land on it)


Will do. Glad you are ok!

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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 6:55 am 
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Joined: Mon Aug 29, 2016 11:19 am
Posts: 406
Alloy m8x1 bolts on cranks? This can't be a good thing can it?

Some pics in this thread show something else but square taper. Never seen this hexagon axle profile before.

Also worth mentioning is that not only the bb axle length is of interest but the offset aswell. They are not all symmetric. It will influence your chainline and chainring/frame gap.

/a


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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 10:32 am 
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Joined: Tue Jan 28, 2014 12:13 am
Posts: 261
prendrefeu wrote:
tmr5555 wrote:
Why are they not available in bigger lengths?


They are advertised for 'Brompton' for a reason. :wink:

Riggggght, Brompton.
The quest for cheap, light cranks continueth...


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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 3:08 pm 
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Joined: Tue May 08, 2012 3:10 am
Posts: 159
Location: Santa Barbara
alcatraz wrote:
Alloy m8x1 bolts on cranks?

Never seen this hexagon axle profile...

/a


The seller specifically says to use steel fixing bolts to install cranks and then switch to the included alloy.

The hexagonal profile is for Tunes "sixpack" BB

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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 3:12 pm 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8509
Location: Los Feliz, Los Angeles, California
I should also note here something relating to 'cranks for brompton' is not just about their available length, it's also a small allusion to the stiffness of the cranks.
If you've ever ridden a Brompton folding bicycle, you may know why they're jokingly called "bomptown" - basically it's super cushy, wonky, and while efficient it can feel like you're riding a clown's bike.

So on a really cushy feeling, twitchy, small-wheeled bike would anyone notice the stiffness of a crank? Nope.

Stiffness of the crank, then, is not a priority in any way for a 'bomptown' build.

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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 6:23 pm 
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Joined: Wed Nov 20, 2013 9:10 pm
Posts: 71
glepore wrote:
At some length they probably get very flexy/break prone. My original toplines had pedal holes that were solid in the back, as many of the early ones fractured there. Precludes the use of pedals without flats.

At my weight (58 kg) they were fine. Bigger guys that aren't spinners might beware. Not sure what spindle length will be needed, I think i used 109's with mine that were originally mtb cranks (done that way to get the 110 bcd, q factor be damned).


That’s a good point - me, at 110kg, and you using the same cranks is just silly - and I would imagine Shimano have built them stronger rather than weaker so you would be fine on these. Don’t think I’d trust them through...

The pedal threads look huge though?

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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 8:07 pm 
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in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 3264
Location: Glermsford, Suffolk U.K
i have middleburn rs2 cranks on an MTB. these are not know for there stiffnes so some say but they feel like cranks to me. I have never noticed flex in a crank regardless of the axle used carbon or alloy arm heaviliy machined or not. This whole stiffness thing is overblown. I think I will be fine with them and they are light and will on on the hill climb special.

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 Post subject: Re: EBay CNC Crank
PostPosted: Fri Sep 29, 2017 8:11 pm 
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in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 3264
Location: Glermsford, Suffolk U.K
only in asymmetric form according to the listing.

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 Post subject: Re: EBay CNC Crank
PostPosted: Thu Oct 12, 2017 2:43 pm 
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Joined: Tue May 08, 2012 3:10 am
Posts: 159
Location: Santa Barbara
Confirmed 335g with alloy fixing bolts. I have a few upgrades I'm working on for my bike. After that, I'll experiment with this crankset and give a little feedback on them.

Image

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