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Old 10-30-2017, 08:58 PM
scsmith scsmith is offline
Join Date: Jan 2008
Location: Ashland, OR
Posts: 1,740

Originally Posted by tgmillso View Post
I just mounted my 380x150-5's and they look great. Does anyone have a recommended tire pressure that I should be running in these?
I run mine at 45--50 psi.
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 470 in 8 years
also LS-6-15/18 sailplane
VAF donation Dec 2017
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Old 10-30-2017, 11:41 PM
tgmillso tgmillso is online now
Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 535

Thanks guys. I'm running the Matco wheel/brake assembly that came with the RV-7 kit and I've run into the clearance issue with the caliper. I've measured the clearance from 20 through to 65psi and plotted it. At 20 psi I have 0.032" at this worst case location, at 65psi I have 4 thou, and based on the shape of the curve I estimate contact at around 90 psi. I see some earlier posts regarding shimming things to improve the clearance, however it's not exactly clear what to shim. If I am to bother shimming say a 0.063" further out , in my mind that would require a 4.5" diameter disc to be fabricated between the brake rotor and the inner rim half, an 0.063" thicker shim that is currently in place against the inboard bearing, and a 0.063" thinner shim between the outer bearing and the axle nut. This would mean that I would not have to drill a new axle position, which I really do not want to do.
Or, I could just leave it at the current clearance and see how things go?
How are others achieving the desired clearance, and what should that target clearance be?
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