|time trial/pursuit bar and fork combo||BAi9302010|
Nov 24, 2001 1:00 PM
|Does anyone know where I can get one of the handlebar/aerobar/fork combos used in pursuit racing and time trials. I think Hotta makes a model. The one in the photo was custom made for Boardman (at least I think it was)to fit the LOOK frame, but almost every other one that I've seen was on a fram with a standard steering tube.|
|re: time trial/pursuit bar and fork combo||Akirasho|
Nov 24, 2001 2:48 PM
|... not exactly sure of what you're looking for...
The system pictured is indeed custom (and probably no longer UCI legal) and not readily available.
Vision Tech, Profile, Cinelli, Syntace and others all make some form of aerobar or aerobar/stem combo... also note that some Pros have used aeros with the LOOK ergo stem to achieve radical positions. You'd be hard pressed to find something like your pic without having it custom built (I'm sure at a premium price unless you've got access to composite fabrication facilities).
What's your application? Is there a reason why a traditional aero won't work? A bit more specific info might help in your search.
Remain In light.
|reason for wanting a different setup||BAi9302010|
Nov 24, 2001 4:02 PM
|In time trials, there are two ways to become more aero. Most people want to get into as narrow a position as possible, but the other way is to get low. I prefer getting lower, as opposed to narrow, because I have a slightly longer back and shorter legs (unlike most people, who have the opposite). The fork/bar setup is made for people who prefer to get lower and who have a flexible lower back. Currently I do use a LOOK Ergo stem, but these have several disadvantages.
1) They are much heavier than conventional stems (especially compared the new one piece setups you mentioned).
2) No matter how tight you make the screws, they almost always slip if you hit a bump or pull hard on your bar.
3) They are very un-aerodynanic when used to get low.
Also, I actually have been thinking about building one of the fork/bar combos, but have several problems in doing so.
1) Obvious lack of experience.
2) I don't know if I can use a pre-made fork and just add the bar part to it. (aluminum corrodes when in contact with carbon so I might have to use a full carbon fork unless I made the base layer with fiber glass)
3)I would need to make a mold out of styrofoam.
Last but not least, this type of bar/fork setup is UCI legal, but most riders prefer regular setups because they are more comfortable and less extreme if you are not as flexible.(I don't race in UCI races anyways, just USCF, which is much more flexible with rules regarding equipment .)
P.S. The picture at the LOOK webpage is of what Boardman would have had to deal with if he had used the regular fork and stem on the frame Credit Agricole provided him with.
Nov 24, 2001 5:26 PM
|I understand your approach, but as far as fabricating with an available product, I wouldn't... you're likely to experience unpredictable stress loads (from a lay POV) that the fork/bar were not designed for... to compensate would mean that any weight savings would be gone. These products are generally designed with finite analysis techniques which max and min design parameters for their intended use... anything above that would be risky...
Didn't some of the GT Superbikes of the '96 Olympic games use a similar setup??
Again, building your own might be a way to go... at a high cost... perhaps in conjunction with a project at a local University or Community College (plenty of wannabee engineers or a thesis paper waiting in the wings, willing to risk a bit of your skin in the attempt). Actually, this might not be a bad way to go... access to some cutting edge tech and folks eager to try it (Some of our local skools specialize in R&D stuff like this).
... another option... would be a custom frameset...
Note the differences in bar height on these two rides...
Both are 60/61cm frames... one with 700C, the other with 650C... top tube length is nearly identical... there's about 1" difference in headtube lengths... This of course, leads to the "gut" factor...
Now, that I've said this... watch and see exactly what you want pop up on eBay...
Remain In light.
|re: time trial/pursuit bar and fork combo||KurtVF|
Nov 24, 2001 3:48 PM
|WOW! That looks painful.|
Nov 25, 2001 8:22 AM
|Bart Sheldrake at LUST Racing is always up for a carbon fiber challange. Mostly he does shoes and in-line skates, but he has done, and is set up to do custom time-trial bars as well. He did a pair for Jonathan Vaughters, and some others. But be warned, they'll be expensive (~$2,500).|| |