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PostPosted: Thu Sep 26, 2013 5:28 am 
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Joined: Tue Jul 14, 2009 2:18 am
Posts: 211
my stock bike comes with 6700 calipers. My friend is selling his brand new 6800 caliper for USD150. Is this consider a brake performance upgrade? or just keep the $$$ for 7900, 9000? sorry no budget for eebrake.

http://www.starbike.com/en/thm-carbones-fibula/

thanks.


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Posted: Thu Sep 26, 2013 5:28 am 


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PostPosted: Thu Sep 26, 2013 5:49 pm 
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Joined: Tue Sep 11, 2012 6:07 pm
Posts: 879
Location: The Lone Star State
it's an upgrade, but not huge. Admittedly, I have not used 6800, but Shimano claims a 10% improvement in braking. I don't personally consider that to be a huge gain, especially given that the brakes are around the same weight (it's also a bit of a nebulous term. 10% improvement in what?). The principal design change is going from a single pivot to a dual pivot. if your brakes work well, go with a good upgrade, to something lighter, or more powerful. This is, in my opinion, barely an incremental step.

also, that price isn't great, considering you can get them brand new for $140 and probably less, if you shop around a little.

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PostPosted: Sat Sep 28, 2013 5:07 pm 
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Joined: Sat Dec 06, 2008 10:14 am
Posts: 981
Location: Sweden
FIJIGabe wrote:
...The principal design change is going from a single pivot to a dual pivot.


Uhm, both 6700 and 6800 are dual pivot, or did I misread you there?

High-jacking the thread a bit, are the 6800 substantially smaller in outer dimensions, as in narrower frontal area, more petite appearance than the 6700? They look that way, but I can't find any decent pictures that would showcase the difference, if there is any?

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PostPosted: Mon Sep 30, 2013 3:58 pm 
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Joined: Tue Sep 11, 2012 6:07 pm
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6700 isn't a true dual pivot. 6700 uses the attaching bolt as the second pivot, whereas 6800 has two dedicated pivots, where the attaching bolt only attaches the brake to the bike.

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PostPosted: Tue Oct 01, 2013 3:57 am 
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Joined: Sun Apr 25, 2010 6:29 am
Posts: 35
The 6800 brakes have more power and better modulation than the 6700's.

Just like the 9000 brakes, the 6800 have a roller between the two arms that they pivot against, giving a very solid, smooth feel.


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Posted: Tue Oct 01, 2013 3:57 am 


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PostPosted: Tue Oct 08, 2013 1:04 am 
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Joined: Tue Jul 14, 2009 2:18 am
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finally i have changed from 6700 to 7900 without paying a premium price. For a brand new set of 7900 only for USD180 and managed to se my 6700 for 70 so i need to top up another 110. result? almost the same but i managed to reduce another 30g.


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