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 Post subject: Crank Transplant
PostPosted: Sat Jul 14, 2012 6:16 pm 
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Joined: Fri Apr 25, 2008 9:36 pm
Posts: 813
Location: Georgia
So I finally fell foul to the inevitable - the dreaded Easton EC90 failure (spindle / spider interface working loose) - and had to get a new crankset. Over the years the BMC (AKA 'old faithful') has been relegated down the pecking order and is now the bad weather / turbo trainer bike so it made sense to not bother with a particularly fancy chainset. I'd also put the 5700 series 105 black groupset on before last winter so that chainset was a no brainer - but My God if the chainrings aren't gopping(!) so a transplant was in order:

EC90 weight:
Image

105 weight (and aren't those pressed rings ugly!):
Image

So what accounts for all the weight difference?
Image

Just 24g in the non-drive side are:
Image

Must be the spider and spindle then:
Image

A full 119g difference (but then what good the weight saving if its going to fail!):
Image

So there's got to be some weight saving to be found in the chainrings right?
Image

Only 6g in the small ring (even more of a surprise as the CT2 is a 38T compared to the 39T 105):
Image

So to the 'big ring':
Image

That's more like it, a full 41g saved (and a whole lot of aesthetic improvement!):
Image

Anything else? Only the bolts, but that can't save much, right?
Image

Wow, I really was wrong, massive 40% of the weight:
Image

So I'm now 66g to the better (and a whole lot less ugly!):
Image

Kinda suits the bike as well (I think):
Image

I've also changed the groupset on the Cyfac to Grey 6700 from Silver 6700 (for no other reason than I thought it a better colour match!) and I still haven't ridden the Baum yet!

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Too old to be fast, too young to be this slow!


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 Post subject: Crank Transplant
Posted: Sat Jul 14, 2012 6:16 pm 


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 Post subject: Re: Crank Transplant
PostPosted: Sun Jul 15, 2012 3:59 pm 
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Joined: Fri Apr 25, 2008 9:36 pm
Posts: 813
Location: Georgia
Better Pic:

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