Montana Owners Club - Keystone Montana 5th Wheel Forum - View Single Post

**Carl n Susan** · 07-23-2020, 10:55 AM

The 80 or 85 numbers are the Aspect Ratio.

The aspect ratio is a percentage. It’s the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of tire width. In other words, it’s sidewall height divided by tire width.

If you have tires with an 85 aspect ratio then they are not the original tires. Montana used 235/80 LT tires in 2002.

07-23-2020, 10:55 AM	#28
Carl n Susan Site Team Join Date: Oct 2005 Location: Carmichael - CA Posts: 7,400 M.O.C. #4831	The 80 or 85 numbers are the Aspect Ratio. The aspect ratio is a percentage. It’s the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of tire width. In other words, it’s sidewall height divided by tire width. If you have tires with an 85 aspect ratio then they are not the original tires. Montana used 235/80 LT tires in 2002. __________________ Carl (n Susan) There is more to life than fuel mileage. 2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB