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Subject: TT Wheels?

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Posted:4/26/2005 10:51:58 AM
I am looking for TT wheels but am not sure what to get. Light, Aero, Strong, Cheap, Flat, Lenticular, Dimpled? Any suggestions

Gary Tingley
Posts:0

Posted:4/26/2005 11:30:43 AM
A couple of questions: 1. What type of racing, and what type of courses? (Hilly, flat, windy, calm, 20k/40k TT or ultra TT, etc.) 2. Do you have trouble handling deep dish wheels in the wind? Will you use a disc? 3. What do you plan to pay for a set? 4. Put these in order of precedence: aero/weight/price

bushido55
Posts:11

Posted:4/26/2005 11:37:57 AM
Time trials. Mostly the 20k Piru TT for now but I would like to expand to 40k. Deep is not a problem. Probably a disc rear but I don't know which one. Cost ? Aero/Weight/Price- I know pick-2. Aero-Price-Weight, I think

Gary Tingley
Posts:0

Posted:4/26/2005 9:15:11 PM
OK, here is a list, I suggest calling Matt at Rock N Road Cyclery to get pricing, great guy that will get you set up right, plus he is an ultra fast TT'r: Option 1 1. Zipp 999 set 2. Zipp 900 disc/HED H3C front Option 2: 1. Renn disc/Zipp 808 front 2. Renn disc/HED 3 front Option 3: 1. Renn Disc/HED Jet

Kam
Posts:12

Posted:4/27/2005 12:38:50 PM

If you want to get geeked out over this, and I'm certainly not a qualified aero-geek!, another thing to consider is the type of frame you're using. Take a wholistic view of your position, frame, wheels and components. Start from the front of the bike and work your way back. See which components (incluing you) face the wind directly and which draft behind others. The need for aerodynamics becomes less, the more in-the-draft something sits...as a crude example, your butt is not as important as your head.

If you've got a curved seat tube and aero tubing for the down tube (i.e. Cervelo P3 and others) then theoretically there is less need to run a disk wheel because the rear wheel tucks in behind the air foiled by the curve and aero tubing. In other words, the turbulance of the rear wheel is minimized because 1. the wheel drafts behind the curved seat post and 2. air is pushed out to the sides which means there is less air being thrown into the rear wheel. In this case, you can run a deep dish or tri-spoke in the back and not lose time to drag, which is a good option for windy days anyway.

The same can be said about the front wheel and fork. Theoretically, the more aero your front fork the less deep your front wheel can be. The shallower the front fork, the deeper your front wheel should be.

I run a HED 3 tri-spoke front and Zipp disk in the back on my P3 even though theoretically I don't need to. But, when you lose minutes (not seconds) to the likes of Matt Ford, it's better to be safe and run that disk anyway!

bushido55
Posts:11

Posted:4/27/2005 1:42:27 PM

Thanks for the response. I have an Abici TT Frame and fork. Vision Tech Areo bar set-up. I have not even thought of trying to keep up with the likes of Matt Ford yet (maybe someday?) but I do need all the help I can get. I think I like the idea of a disk in the rear and a deep dish in front. My road race wheels are the X-treme Matrix Elites and have a 45mm deep rim (very similar to the Reynolds Stratus DV-UL). Do you think these are deep enough or would you suggest deeper? How much benefit do you think a deeper front would give?

What do you know about the Renn Disc. It looks good and doesn't cost much.

Thanks

Grant Sample
Posts:30

Posted:4/27/2005 2:43:38 PM

Yeah it's a good idea of not trying to keep up with Matt, that guy barely qualifies as being human!

You are exactly right with the disc in the rear and a deep in the front. I was riding a pair of Velomax deep dish carbons on my TT bike for most of this TT season, and when I got a disc I dropped 48 seconds off my previous best at Fiesta Island. So even though "theoretically" you should be able to use just a tri spoke or whatever I say you can't argue with results. From my own personal point of view I would think that your current set up is better than nothing but a deeper front wheel is better. I still use my Velo. on the front and it's a 58 mm profile. A tri spoke is better and the new Zipp 999's are even better still. About the Renn, that's a good wheel. I actually called them up while I was shopping for a disc and yes their prices are very good. They are also nice and light. I would say you can't go wrong with them. Another thing you might want to consider is that there are two kinds of discs. Hed makes their discs all lenticular shaped which supposedly is more areodynamically efficient. I tend to put alot of faith in anything Hed does because Steve Hed knows his sh*t. I personally ride an X-lab disc which is also lenticular shaped. Reasonablly priced at around 800 bones or so. nice and light too. bottom line is that there is so much out there and everything is fairly close in performance to the other that it really comes down to what you're willing to spend.

bushido55
Posts:11

Posted:4/29/2005 12:59:44 PM
Thanks for the help. I ordered the Renn disc. Not the lightest but you can't beat the price.

Grant Sample
Posts:30

Posted:4/29/2005 4:06:30 PM
just our of curiosity did you get the regular 5ive se7en 5ive or one of their newer models like the Kaiser or the Madeira? I think the Madeira is a cool piece.

bushido55
Posts:11

Posted:4/29/2005 4:12:59 PM
Ordered the 575.

Gary Tingley
Posts:0

Posted:4/29/2005 8:21:19 PM
great disc, used it for a season, very fast

bushido55
Posts:11

Posted:6/5/2005 2:46:12 PM
Got my Renn Disc. Mounted a Vittoria tire with Tufo Extreme Tape. Broke it in at the Piru TT today. Although I am slow the wheel was great. It feels lighter than claimed, rolls smooth and it did not bother me in the wind. This wheel is awesome and only $400. Thank you all for the great advice. Now I have to work on the engine.

Gary Tingley
Posts:0

Posted:6/5/2005 7:01:29 PM
yep, it is all about the engine - and mental preparation TT is as much a mental sport as it is physical

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