Recommended PSI?

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Recommended PSI?

Postby lllusion » September 27th, 2013, 7:29 pm

What is the recommended PSI for the following setups--for dry roads, for wet roads?

FLO 30:
Continental GP 4000S Tire
Michelin Airstop Tube 700x18-23 52mm PV

FLO 60:
Continental GP 4000S Tire
Michelin Aircomp Ultra Light Tube 700x18-23 52mm PV
Zipp 33mm Valve Extender

FLO 90:
Continental GP 4000S Tire
Michelin Aircomp Ultra Light Tube 700x18-23 40mm PV
Zipp 72mm Valve Extender

TIA!
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Re: Recommended PSI?

Postby PenguinBoy » September 30th, 2013, 6:41 pm

Would the Continental inner tubes 18-25 work just aswell? Or will be too big?
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Re: Recommended PSI?

Postby Chris Thornham » October 1st, 2013, 8:15 am

TIA,

We recommend inflating your tires to between 80 and 105psi. You will have to experiment with that range to determine what is best for you. Some people prefer the higher end, and other prefer the lower end. The lower end would likely add a little grip and comfort and the higher end could potentially add a little speed. It's hard to say exactly with the large number of variables that exist during a ride.

I hope that helps,
Chris Thornham
FLO Cycling: http://www.flocycling.com
FLO Blog: http://bit.ly/b3Zlpq | Twitter: http://bit.ly/bOQ08x | Facebook: http://bit.ly/d8KDhI
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Re: Recommended PSI?

Postby Bruizer » October 30th, 2014, 1:39 pm

Chris,

What is the basis for limiting the tire pressure to 105 psi when the tires and tubes are rated for up to 120 psi? I ask this because this limitation may have an impact on rolling resistance.

Mike
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Re: Recommended PSI?

Postby Chris Thornham » October 30th, 2014, 3:11 pm

Bruizer wrote:Chris,

What is the basis for limiting the tire pressure to 105 psi when the tires and tubes are rated for up to 120 psi? I ask this because this limitation may have an impact on rolling resistance.

Mike


That's a basic guideline. Simply put, wider rims don't require as much pressure. Think of your car tire or even a MTB tire. They use much less pressure. We've actually just written a blog article that should help you find the optimal tire pressure. Here's a link.

http://flocycling.blogspot.com/2014/09/flo-cycling-tire-pressure.html

Please let me know if you have any additional questions.
Chris Thornham
FLO Cycling: http://www.flocycling.com
FLO Blog: http://bit.ly/b3Zlpq | Twitter: http://bit.ly/bOQ08x | Facebook: http://bit.ly/d8KDhI
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Re: Recommended PSI?

Postby Bruizer » October 31st, 2014, 6:45 am

Thank you, Chris!

This is an excellent reference!

So as I understand it, the 105 psi recommended limitation has nothing to do with the strength, stiffness, safety, etc, of your wheels with 23 mm tubes and tires rated for 120 psi max. As a heavier rider (195 lbs), I plan to experiment with different pressures from 105 to 120 psi once my FLO disk arrives. :-)

In your blog, you state the data in the chart was adjusted for the width of FLO rims. Was this just a ratio of rim width to pressure?

Mike
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Re: Recommended PSI?

Postby Chris Thornham » October 31st, 2014, 11:11 am

Mike,

The 105 is a recommendation for most based on performance. A lot of people believe the higher the pressure the better and this can become a safety issue. We have a recommended range on there because we need to. I'd follow the chart I provided for the best numbers. Experimenting inside that range is also fine to do. I just wouldn't go above the highest pressure recommended by your tire manufacturer.

The tire pressures were adjusted to account for the extra width of the FLO rims. The pressures were reduced by 4-5%.

I hope that helps,
Chris Thornham
FLO Cycling: http://www.flocycling.com
FLO Blog: http://bit.ly/b3Zlpq | Twitter: http://bit.ly/bOQ08x | Facebook: http://bit.ly/d8KDhI
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Re: Recommended PSI?

Postby Bruizer » November 3rd, 2014, 10:42 am

Thanks, Chris!

It helps a lot!

Mike
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