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Guys, I would first say that I have spend the last 30 minutes using the search facility but can't find what I needed.

I recall a thread, in the not too distant past, about tyre pressures with reference to rider weights. My training partner is using the above tubulars at 130psi for racing and can only weigh (that's a subject we can talk about) 90-100 lbs max! I have said that it's a little on the high side and on the rough roads we race on she must be bouncing about like a pea on a drum!

I can't recall which wheels she is racing on this season but know they are deep rim carbon spoked wheels a la 404s or Planet X equivilent.

Can anyone direct me to the right information that I can present to her please?

Since the Zipp Tangentes are basically the same tire with a different tread, it should be OK to use the recommendations on the Tangente box:

So...it looks like she should be using more like 110-112 psi, or on rough roads 105-109 on the front and 103-108 on the rear.

In my own testing on the "open tubular" version of these tires (Open Corsa KS) and latex tubes, I found that it was FAR better to "err" on the side of slightly too little pressure, than too much.

http://forum.slowtwitch.com/...%20pressure;#1909561

Now, that data above is for MY WEIGHT (73kg), and MY ROAD...at her significantly lower weight, the "breakpoint" pressure (the pressure above which the total resistance to forward motion rises dramatically) may be at an even LOWER pressure.

Not only is she needlessly bouncing herself around out there running 130psi, but she's also slowing herself down too.

HTH,
Tom

http://bikeblather.blogspot.com/

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