|FSA carbon pro vs. pro team... any difference?||slomo|
May 1, 2003 9:42 PM
|does the carbon spider of the pro team offer increased stiffness over the regular pro model with the aluminum spider? i can induce chain rub, on my calfee luna pro, when really torquing the pedals and i was hoping an fsa crank mated to a splined or isis BB would stiffen things up.
|re: FSA carbon pro vs. pro team... any difference?||russw19|
May 1, 2003 10:42 PM
|Crank stiffness is a touchy subject... In all the stress tests that are done on crank stiffness they use a Tarantula machine to flex the crank. Some measure stiffness at the end of the crank arm and some at the spider (a better indicator of crank stiffness) but the results are in thousandths of an inch. The stiffer crank maybe one or two thousandths of an inch stiffer.. in the real world, you won't be able to tell the difference. A thousandth of an inch is the width of a very fine hair.
Now where you are better off looking for stiffer parts is the bottom bracket. The ISIS and Shimano Octalink spindles are stiffer than traditional square taper spindles by a factor of 3 in some tests. That's noticable.
Now you asked about the FSA crank and the Team Issue. In theory the Team with the carbon spider is stiffer, but it's also lighter. And the price difference isn't that great, so if you can get the Team, get it. But the difference you will notice is when you mate it to a much stiffer ISIS spindle.
But all this is not really gonna solve the problem of flex if your flex is at the frame. Keep that in mind. (I am not knocking your frame, but I have never riden one, so I don't know how stiff they are either.)But if you are buying this to solve for stiffness problems, you may be disappointed. Buy it becuase you like it and it looks good and you won't be upset if it's not any stiffer than your old set up.
Just my opinion.... I bet you get others that say otherwise...
|Good points russ.||alansutton|
May 2, 2003 8:55 AM
|Concern yourself with bottom bracket spindle flex rather than crank arm flex. Stay clear of Titanium, which is half as stiff as steel. Traditional square taper spindles still have their place however. There are many poorly engineered bottom bracket designs, which may have influenced the outcomes on these "tests". Campagnolo still has one of the lightest/stiffest most reliable designs on the market. Remember, over half the pro peloton is riding square taper BBs.|
|Triple bearing Bottom Brackets....||russw19|
May 2, 2003 1:35 PM
|Triple bearing bottom brackets are also way stiffer than double bearing setups. If I am right, the Record Bottom Bracket is a triple setup. That's what makes it so good. But before you go and buy a Record BB for a Shimano crank, keep in mind that square Italian tapered BB's don't really fit JIS tapered cranks. Meaning it's not the best idea to put a Dura-Ace square crank on a Record bottom bracket.
As for the Ti spindles... Ti square spindles flex quite a bit and have weight limits on them... but the newer ISIS designs are much stiffer. I have an FSA Pro Ti BB and it's fine and I am a long crank, big gear mashing, ex-sprinter type. But if you really want a stiff BB get one with a triple bearing set up. It makes a huge difference.
just more opinions...
|FSA Cranks: Sweet , FSA BB: Trash!! [Check around!!] nm||DUOHEAD|
May 2, 2003 9:13 PM