I currently ride a 90mm HED Jet rear on my P2C. I am sure you are all going to tell me that I should be running a disk in the rear, which is fine, but my question is how much time will I likely save if I were to run a HED Disk vs my 90 Jet? (I also currently run a 60 front).
Also, this would put me with a clincher set of roughly 2000grams (w/o tires and tubes). So say I did ride the HED Disk 60 front, both clincher…based off one of the recent threads on how clinchers have less rolling resistance than tubulars, would this setup be faster than my tubular disk/100 or 50 front? Weights for these two combos are roughly 1600grams (w/o tubulars).
Any opinions or comments? I can’t decide what I want or should use?!?!
If you check the Hed site you can see the aero drag figures for both wheels.
Why not just buy a $100 custom cut disc cover from wheelbuilder.com and have both options? Check with them first, but I believe they can cut a disc for a 90mm wheel.
I guess maybe I should break this down better. I already have a 1600gram Tubular wheelset, disk and 100mm front. What I am wondering is…would this wheelset be faster (being that is tubluar but lighter), than a clincher disk/60mm front (2200grams, but clincher and as stated by prior threads, clinchers yield lower rolling resistance). In which case, if the second option (clincher) would be faster, I have a lline on a clincher disk.
Given the best clincher vs best tubular tires, the rolling resistance is real close. So call that a wash.
your 60mm clincher front is torrodial so at some yaw angles might be quicker than your 100mm, but overall i bet the 100mm is faster.
if it was me, Id get a 90mm hed jet front with a disc cover on your current 90mm rear.
Front wheels matter more than rears
discs are almost always quicker
I guess maybe I should break this down better. I already have a 1600gram Tubular wheelset, disk and 100mm front. What I am wondering is…would this wheelset be faster (being that is tubluar but lighter), than a clincher disk/60mm front (2200grams, but clincher and as stated by prior threads, clinchers yield lower rolling resistance). In which case, if the second option (clincher) would be faster, I have a lline on a clincher disk.
idk if i buy that disc covers as good as discs.
idk if i buy that disc covers as good as discs.
spend a few bucks at www.biketechreview.com and you can see some hard data for yourself to make the decision.
or, revel in ignorance forever!
So JackMott, you are conceding that my clinchers ARE faster than my tubulars (albeit me having a tubular disk/100mm front and only 1600grams) verus the heavier clinchers and add a wheel cover??? Seriously, this is not a sarcastic comment (I hate the color pink;)
You should try to get sponsored by Wheelbuilder (or are you already?), I think you recommend their wheel covers in about 90% of your posts. 
no, you will notice I say that the 100mm rim is probably faster overall.
even ignoring the weight.
also be sure to consider the weight of your spare tire kit when comparing!
So JackMott, you are conceding that my clinchers ARE faster than my tubulars (albeit me having a tubular disk/100mm front and only 1600grams) verus the heavier clinchers and add a wheel cover??? Seriously, this is not a sarcastic comment (I hate the color pink;)
I’m not, sadly.
But yeah sometimes in this life you come across things that just make too much sense.
So you gotta run with it =)
You should try to get sponsored by Wheelbuilder (or are you already?), I think you recommend their wheel covers in about 90% of your posts.
i couldnt rationalize that use of money.
but just for the sake of argument arent discs:
-more aero, absolutely no gaps between cover and tire
-stiffer
-lighter, i suppose that only matters up hills
wouldnt a cover tend to flex in the wind? im really just trying to find cheap improvements on the bike. i really want the disc cover to be as good as a normal disc. it seems that aero bars + disc give the most cost effective reduction in drag. im, still not on board with aerohelmets being faster when riders are turning the tail into the wind.
In one test I have seen, a disc cover was more aero than a particular disc.
stiffness would depend on what spoked wheel you use as a base for the cover. in general if anything people prefer spoked wheels handling to most discs.
weight again depends on the base wheel you use for the cover. Many wheel + cover combinations are lighter than many dedicated discs.
If I had money to blow I would probably use a Hed Jet Disc. As it I use an $80 wheel with a $75 cover. The few grams of weight penalty don’t matter much for me at 6’3". If I was a little guy I might get a $300, lighter rear wheel to pair with the cover =)
and aero helmets are faster whether you are looking down or not. this much has been demonstrated on the track and in the wind tunnel.
i couldnt rationalize that use of money.
but just for the sake of argument arent discs:
-more aero, absolutely no gaps between cover and tire
-stiffer
-lighter, i suppose that only matters up hills
wouldnt a cover tend to flex in the wind? im really just trying to find cheap improvements on the bike. i really want the disc cover to be as good as a normal disc. it seems that aero bars + disc give the most cost effective reduction in drag. im, still not on board with aerohelmets being faster when riders are turning the tail into the wind.
ill definitely think about what you said about a wheel cover.
The aero advantage will easily outweigh the weight increase and any rolling res. issues, go with the disc.