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carbon road forks(10 posts)

carbon road forkssoulsurfer104
Nov 16, 2003 10:53 AM
i am looking at a few different carbon forks right now and i was curious as to the handling/performance difference between straight-bladed forks and curved-bladed forks. i much prefer the looks of straight legs, but is there any difference in terms of performance? any other info about carbon forks is also appreciated. thanks.
re: carbon road forkslyleseven
Nov 16, 2003 11:41 AM
Straight forks tend to be stiffer. A lot depends on your weight. If over 200 lbs, consider the Wound Up or a stiff Reynolds. They have a new Crit fork that is very stiff. If weight is not an issue, stay away from the flimsy forks for better handling. You can actually stress them with your hands in the local bike shops to compare. If stiff enough, the curved fork should be adequate also.
re: Straight = stifferRusty Coggs
Nov 16, 2003 11:46 AM
A generalization that is not always true. A Wound-Up is is a pretty stiff straight fork.Others,depending on brand and design often are not.
re: carbon road forksBirddog
Nov 16, 2003 11:44 AM
Shouldn't be any difference. It's just 2 different approaches to fork rake.
Birddog
re: carbon road forksRusty Coggs
Nov 16, 2003 11:48 AM
Assuming everything else is equal.
no inherent difference btw straight and curved bladeKerry Irons
Nov 16, 2003 6:23 PM
It's all about how much carbon, how it was laid up, wall thickness, etc. Whether curved or straight is purely aesthetic.
Wrong...lyleseven
Nov 17, 2003 6:12 AM
If the amount of carbon is the same, and the lay up is the same, a curved fork will have more flex than a straight fork. You can design a curved carbon fork to be as rigid as a straight fork, but you have to lay it up differently, etc. But other things being equal, the straight fork is stiffer.
Straight is stiffer...Nessism
Nov 17, 2003 1:04 PM
...and if you have some really nice instrumentation, you might even be able to measure it. Difference is likely to be similar to the difference in the length though, less than 5% is my guess.

Ed
Do you have any data to support this?Kerry Irons
Nov 18, 2003 5:21 PM
Are you just assuming that this is because the curved fork is a few mm longer and therefore must be heavier for equal stiffness? The fork bends largely at the crown, and at that point the large members of the fork can't "tell" whether the ends are straight or curved. I'm guessing that a detailed finite element analysis would show differences in the third siginficant figure - nothing you could notice. Share your data.
Do you have any data to support this?lyleseven
Nov 19, 2003 8:57 PM
You keep ignoring the underlying issue "other things being equal". If the CF is laid up the same way on straight v. curved fork, the bend (and perhaps the extra length) makes it more vulnerable for flex. Certainly, if you lay up the fibers to offset the bend or add fibers at the bend you could equalize the stiffness. The crown issue is separate. Two identically constructed forks with different bends at the crown (or different crowns) can also affect the stiffness. Bottom line, however, there is probably not a noticeable difference for most riders. For heavier riders, probably more likely to notice the difference.