Question posted on another forum (see link). http://www.ahooga.com/wwwboard/messages/273952.shtml Model A snowmobile quiz: Mac has a Model A with tracks made of a flat rubber belt. The distance around the outside of the track is 150 inches. Joe comes over and tells Mac that he replaced the 30 inch diameter tires on his Model A with 33 inch diameter tires and this increased his speed by 10%, so he could now drive 44 MPH at the same engine RPM where he used to drive only 40 MPH. This gives Mac the idea to bolt a bunch of wood blocks to his flat rubber track. After adding the wood blocks the track now measures 165 inches around the outside of the track. At the same engine RPM, how has the speed been affected by adding the wood blocks to the track? We can't seem to agree on correct answer.