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PostPosted: Sat Jun 07, 2014 10:32 pm 
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Joined: Sat Jun 07, 2014 9:59 pm
Posts: 11
I just bought a 2014 Cervelo R3 with the 105 group set. I am 45 years old, 5'10" and 170 pounds. Most of my training is geared toward preparing for fondos and multi day events in the mountains. I live in Helena Montana, which is on the continental divide so I spend a lot of my time on long and steep ascents. I am upgrading to mostly Ultegra 6800 components; shifters, brakes, derailleurs, 11-32 tooth cogset and chain. The R3 came with the BBright PF-30 BB and FSA BBright 50-34 crankset. What are some options for the replacement crankset? I've considered sticking with the Ultegra 6800 here also. For under $400 (crankset including rings), which others would you recommend to shave some weight and bump up the performance? Wheel build and cockpit are up next.


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Posted: Sat Jun 07, 2014 10:32 pm 


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PostPosted: Sun Jun 08, 2014 2:27 am 
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Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1646
Location: Santa Cruz, California, USA
Changing cranks will not increase performance other than the far too small to measure amount gained from lighter weight... if the new cranks are lighter. I think the 6800 cranks weigh the same as the FSA ones and that's before the adaptors the 6800 would need to run in 30mm ID bearings.

BBright is not PF30. It's wider. So you can't use a true BB30/PF30 crank with a short spindle.

The only advantage that Ultegra has over 105 is lighter weight. Changing groups is an expensive way to cut weight.


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PostPosted: Sun Jun 08, 2014 5:42 am 
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eric wrote:
Changing cranks will not increase performance other than the far too small to measure amount gained from lighter weight... if the new cranks are lighter. I think the 6800 cranks weigh the same as the FSA ones and that's before the adaptors the 6800 would need to run in 30mm ID bearings.

BBright is not PF30. It's wider. So you can't use a true BB30/PF30 crank with a short spindle.


Cervelo lists "Bottom Bracket BBright™ PF-30" on the specification list of the R3, R5, S2, S3, S5, P2, P3, P5...actually every current model except for the Project California. So are you saying that they actually have limited what cranksets you can equip their frames with? What style and size of cranks can you run on the Bottom Bracket BBright™ PF-30?
They flash "BBright increases system stiffness and reduces frame weight while allowing for a large range of crank compatibility in a modern press fit system." as a beneficial feature on each of their bike model's respective web page. Are they misleading me, the buyer? I'm just trying to address one issue at a time with my rebuild project.


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PostPosted: Sun Jun 08, 2014 7:20 am 
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Joined: Sat May 12, 2012 8:32 am
Posts: 350
Location: Adelaide, Australia
Cookiedds wrote:
. Are they misleading me, the buyer?


The short anwser would be no, you can still use many of the cranks on the market, just have to make sure the splindle length is long enough. The "true" BB30 cranks (like the SRAM red BB30) have a much shorter splindle so can't be used. You can use most cranks with an adaptor.

http://www.bbright.net/supportingbrands.aspx

EDIT (a picture paints a thousand words)

Image

On the right is a "true" BB30 crank, note how the splindle is shorter than the "not true" BB30 crank.

_________________
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PostPosted: Sun Jun 08, 2014 6:33 pm 
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Joined: Tue Dec 27, 2011 2:19 pm
Posts: 590
I recently traded in the rotor3d+ that came on my r5 for a campagnolo over torque... Lost about 120 grams on that trade, you can't go wrong with any of the big names like shimano or rotor, I would shy away from The feather weight stuff a lot of it doesn't test out very stiff.


Sent from my iPad using Tapatalk


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PostPosted: Sun Jun 08, 2014 7:15 pm 
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Joined: Wed Jan 01, 2014 8:33 pm
Posts: 25
Rotor 3D+ is going to be your best bet. If you're thinking of going the power meter route you can also use the SRAM Quarq power meters, as those (and the new 11 speed Force, but not Red) are BBRight compatible. The BBRight website has all of the information you could ever want.

http://forums.cervelo.com/forums/5.aspx is also a goldmine.


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PostPosted: Sun Jun 08, 2014 9:54 pm 
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Joined: Mon Apr 21, 2014 9:17 pm
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I went from the FSA BBRight crank to the Rotor 3D+ with a SRM powermeter. I found it to be a lot stiffer. Don't know if that translates into a faster cyclist... but it feels great!


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PostPosted: Sun Jun 08, 2014 10:58 pm 
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Thanks, great info and links.


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PostPosted: Mon Jun 09, 2014 4:18 pm 
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Joined: Sat Jun 07, 2014 9:59 pm
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Will the FSA SL-K Light compact 50/34 work with the stock Cervelo BB and the Ultegra 6800 11 speed shifters, derailleurs and rear Cogset? Looks light, solid and frankly, I really like the esthetics.


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PostPosted: Mon Jun 09, 2014 4:41 pm 
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Joined: Thu Mar 26, 2009 11:06 pm
Posts: 167
I'm slightly confused as I wasn't aware that FSA made a native BBright crankset so it might be that your existing FSA chainset is running with an adapter. In which case you could use any chainset of the same standard (BB386 evo or 24mm spindle?).

TBH it's hard to think of a sound reason apart from 'upgradeitis' to swap out your existing chainset. If the rings are worn, just get replacement rings :D


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PostPosted: Mon Jun 09, 2014 7:38 pm 
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Joined: Mon Apr 21, 2014 9:17 pm
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In that case, I would highly recommend the Praxis Works chainrings! Those are rock solid, just as the DuraAce ones!


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PostPosted: Tue Jun 10, 2014 6:04 pm 
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Joined: Fri Jun 05, 2009 9:40 am
Posts: 414
Location: Switzerland
Cookiedds wrote:
Will the FSA SL-K Light compact 50/34 work with the stock Cervelo BB and the Ultegra 6800 11 speed shifters, derailleurs and rear Cogset? Looks light, solid and frankly, I really like the esthetics.



not if it is a BB30 crankset

if it is 386EVO or MegaExo only with the help of adapters

if it is a BBRight Crankset, no problem

shifters, deraillieurs and all that, no problem


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Posted: Tue Jun 10, 2014 6:04 pm 


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