Pick Up Post Reposted from @mud_dust_overlanding ・・・ Thanks for sharing * #Repost ・・・・・・・・・・・・ REVs/Miles vs CIRCUMFERENCE My last post about tire size has generated more interrogations than expected. Like everyone, I have watched all the YouTube tire pressure and tire sizes. Unfortunately, most YouTubers are wrong as they don't understand the basic principles of physics. The problem now is they have created die-hard myths amongst the Overlanding community. I explained in a previous post why your tire pressure was too low. The myth or misconception is still shared today by most if not all YouTubers. I have even read on an online magazine that tire pressure had no effect on rev/miles because the tire pressure doesn’t change the circumference. It's really hard to explain in an Instagram post simply. On the 1st photo, both front and rear tires have a white dot above the contact patch. I drove in a perfect straight line and took a second shot after some 100 m (330 ft). The white dots are not aligned anymore because the deflated tire revs/mile was higher. In other words, the deflated tire spinned faster. A deflated 33” tire has the same revs/mile as a 31” tire if the distance between contact patch (the road) and the axle is the same. Therefore, your tire size is the radius between the road and the axle x2 and the result, it the actual diameter. To summarize, a 33” tire that has lost 1” in height is a 31” tire. Now, forget about your circumference, in this case, it is irrelevant. I could explain but not in this post! 🥵The revs/mile is determined by the actual diameter. Save this post and share it with a friend if you think it could be useful. #mythbuster #mythbusting #mudtire #mudtires #mudtyres #overlanders #overlandbound https://www.instagram.com/p/CQbHL48nZGl/?utm_medium=tumblr
