Sorry I don't know what the standard tire size is for the -14. But for my RV-8, the larger 380-150-5 are absolutely fantastic on grass. Standard wheel pants fit, mounted 3/4" or so higher than standard, and a blister bulge on the inside to help clear the brake caliper. I would absolutely recommend these to anyone that operates on grass, gravel, sand, dirt.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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