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Active Member
 Tire pressures
Just put on some tire pressure monitors and took the Spyder out for a 20 mile ride, two up. Temp about 91 degrees. Front Federal Formoza AZ01's went up about 1 psi. The Arachnid on the back went up over 3 psi. Comments?
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Very Active Member
Way back, when I was doing sport car racing, when the TP rose 10% from cold to hot, we knew we had the correct PSI.
Ours is a red, black and chrome 2017 F3 Limited. Bought new in 2/2019. The avatar is my first bike back in 1952, a Simplex Servi-Cycle. Photo taken at the Barber Museum.
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What pressure do you start off with in the Formozas? I just had mine installed today and am wondering what psi to run them at.
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Very Active Member
 Originally Posted by HippieSpyderChick
What pressure do you start off with in the Formozas? I just had mine installed today and am wondering what psi to run them at.
17psi
My Spyder  
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I have the stock Kendas, 20 front 28 rear. Mine will rise to 22 and 31 each time here in the AZ heat.
2016 RTL "Boris"
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Vredestein Quatrac 5 175/55R15 - Fronts
General Altimax RT43 215/60R15 - Rear
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I run my Federals at 20 psi front and the Arachnid on the rear at 30 psi. The fronts started at 20.3 and went to 21.4. The Arachnid went from 29.1 to 32.3.
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Very Active Member
Tire pressure is going to increase by different amounts depending on the ambient air temperature, how long you ride, how fast you ride and what kind of riding you do, amongst other things.
Artillery lends dignity to what would
otherwise be a vulgar brawl.
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Cognac 2014 RT-S
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Very Active Member
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Very Active Member
ah...tires
So much has come across here on tires that it does drive most to skip it all and ask straight out questions about them. This is still the best way and we always get more information. So now we have the option of driving along and seeing the tire pressure go up and down accordingly and some will no doubt adjust it as it does. For all the years prior it was never a problem....check before you ryde and enjoy the ryde worry free. You just need to find the best pressure for you and your ryding style. Check it on your gadge then turn it off till the next ryde. Less worry and distractions safer ryde...just my view...
Gene and Ilana De Laney
Mt. Helix, California
2012 RS sm5
2012 RS sm5 , 998cc V-Twin 106hp DIY brake and park brake Classic Black
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Very Active Member
Originally Posted by Chupaca
...check before you ryde and enjoy the ryde worry free...
Right from the MSF basic course.
Artillery lends dignity to what would
otherwise be a vulgar brawl.
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Cognac 2014 RT-S
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…. that being said most folks have good luck with 15 to 17 psi on the fronts …. IF THEY ARE CAR TIRES ….. they are strong enough to keep the bead secure and allow the tire to perform at it's potential …. especially when the road is WET …… I was a trained accident investigator and learned a great deal about tires, in the course of my studies..... over the past 8 years I have posted a ton of stuff about the " why lower PSI's work on the Spyders ", also check for posts by Peter Aawen, He is also an Expert on tires ….. good luck …. Mike 
